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Java第十八天
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‎day18/Map集合的两种遍历方式图解.bmp

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‎day18/code/day18_Collections/.classpath

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<?xml version="1.0" encoding="UTF-8"?>
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<classpath>
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<classpathentry kind="src" path="src"/>
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<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.7"/>
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<classpathentry kind="output" path="bin"/>
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</classpath>

‎day18/code/day18_Collections/.project

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<?xml version="1.0" encoding="UTF-8"?>
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<projectDescription>
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<name>day18_Collections</name>
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<comment></comment>
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<projects>
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</projects>
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<buildSpec>
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<buildCommand>
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<name>org.eclipse.jdt.core.javabuilder</name>
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<arguments>
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</arguments>
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</buildCommand>
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</buildSpec>
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<natures>
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<nature>org.eclipse.jdt.core.javanature</nature>
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</natures>
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</projectDescription>

‎day18/code/day18_Collections/.settings/org.eclipse.core.resources.prefs

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eclipse.preferences.version=1
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encoding//src/cn/itcast_03/PokerDemo.java=UTF-8
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encoding//src/cn/itcast_04/PokerDemo.java=UTF-8

‎day18/code/day18_Collections/.settings/org.eclipse.jdt.core.prefs

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eclipse.preferences.version=1
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org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
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org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.7
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org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
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org.eclipse.jdt.core.compiler.compliance=1.7
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org.eclipse.jdt.core.compiler.debug.lineNumber=generate
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org.eclipse.jdt.core.compiler.debug.localVariable=generate
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org.eclipse.jdt.core.compiler.debug.sourceFile=generate
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org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
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org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
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org.eclipse.jdt.core.compiler.source=1.7

‎day18/code/day18_Collections/bin/cn/itcast_01/CollectionsDemo.class

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‎day18/code/day18_Collections/bin/cn/itcast_02/ArrayListDemo$1.class

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‎day18/code/day18_Collections/bin/cn/itcast_02/ArrayListDemo.class

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‎day18/code/day18_Collections/bin/cn/itcast_02/Person.class

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‎day18/code/day18_Collections/bin/cn/itcast_03/PokerDemo.class

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‎day18/code/day18_Collections/bin/cn/itcast_04/PokerDemo.class

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‎day18/code/day18_Collections/src/cn/itcast_01/CollectionsDemo.java

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package cn.itcast_01;
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import java.util.ArrayList;
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import java.util.Collections;
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/*
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* Collections：是针对集合进行操作的工具类。里面包含了排序和查找等方法。
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* 面试题?
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* Collections和Collection的区别?
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* Collections:是针对集合进行操作的工具类，包含了排序和查找等功能。
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* Collection:是单列集合的顶层接口，定义了单列集合的共性功能。
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*
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* 掌握的功能：
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* public static <T> void sort(List<T> list):排序
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* public static <T> int binarySearch(List<?> list,T key):二分查找
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* public static <T> T max(Collection<?> coll):最大值
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* public static void reverse(List<?> list):反转
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* public static void shuffle(List<?> list):随机置换
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*/
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public class CollectionsDemo {
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public static void main(String[] args) {
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// 创建集合对象
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ArrayList<Integer> array = new ArrayList<Integer>();
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// 添加元素
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array.add(30);
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array.add(20);
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array.add(50);
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array.add(10);
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array.add(40);
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System.out.println("array:" + array);
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// public static <T> void sort(List<T> list):排序
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// Collections.sort(array);
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// System.out.println("array:" + array);
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// [10, 20, 30, 40, 50]
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// public static <T> int binarySearch(List<?> list,T key):二分查找
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// int index = Collections.binarySearch(array, 30);
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// System.out.println(index);
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// public static <T> T max(Collection<?> coll):最大值
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// Integer max = Collections.max(array);
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// System.out.println(max);
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// public static void reverse(List<?> list):反转
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// Collections.reverse(array);
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// System.out.println("array:" + array);
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// public static void shuffle(List<?> list):随机置换
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Collections.shuffle(array);
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System.out.println("array:" + array);
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}
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}

‎day18/code/day18_Collections/src/cn/itcast_02/ArrayListDemo.java

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package cn.itcast_02;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.Comparator;
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/*
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* 用ArrayList存储自定义对象，并按照年龄进行排序
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*/
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public class ArrayListDemo {
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public static void main(String[] args) {
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// 创建集合对象
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ArrayList<Person> array = new ArrayList<Person>();
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// 创建元素对象(蒋干盗书)
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Person p1 = new Person("曹操", 35);// 后知后觉
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Person p2 = new Person("蒋干", 33);// 不知不觉
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Person p3 = new Person("诸葛亮", 34); // 先知先觉
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// 添加元素
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array.add(p1);
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array.add(p2);
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array.add(p3);
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// 排序
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// Collections.sort(array);
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Collections.sort(array, new Comparator<Person>() {
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@Override
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public int compare(Person p1, Person p2) {
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return p2.getAge() - p1.getAge();
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}
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});
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// 遍历集合
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for (Person p : array) {
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System.out.println(p.getName() + "---" + p.getAge());
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}
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}
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}

‎day18/code/day18_Collections/src/cn/itcast_02/Person.java

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package cn.itcast_02;
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public class Person implements Comparable<Person> {
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private String name;
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private int age;
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public Person() {
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super();
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}
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public Person(String name, int age) {
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super();
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this.name = name;
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this.age = age;
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}
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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public int getAge() {
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return age;
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}
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public void setAge(int age) {
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this.age = age;
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}
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@Override
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public int compareTo(Person p) {
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return this.age - p.age;
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}
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}

‎day18/code/day18_Collections/src/cn/itcast_03/PokerDemo.java

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package cn.itcast_03;
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import java.util.ArrayList;
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import java.util.Collections;
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/*
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* 模拟斗地主洗牌和发牌
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*
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* 扑克牌：54
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* 小王
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* 大王
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* 黑桃A,黑桃2,黑桃3,黑桃4,黑桃...,黑桃10,黑桃J,黑桃Q,黑桃K
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* 红桃...
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* 梅花...
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* 方块...
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*
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* 分析：
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* A:造一个牌盒(集合)
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* B:造每一张牌，然后存储到牌盒里面去
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* C:洗牌
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* D:发牌
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* E:看牌
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*/
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public class PokerDemo {
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public static void main(String[] args) {
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// 造一个牌盒(集合)
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ArrayList<String> array = new ArrayList<String>();
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// 造每一张牌，然后存储到牌盒里面去
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// 定义花色数组
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String[] colors = { "♠", "♥", "♣", "♦" };
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// 定义点数数组
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String[] numbers = { "A", "2", "3", "4", "5", "6", "7", "8", "9", "10",
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"J", "Q", "K" };
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for (String color : colors) {
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for (String number : numbers) {
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array.add(color.concat(number));
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}
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}
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array.add("小王");
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array.add("大王");
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// 看牌
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// System.out.println(array);
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// 洗牌
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Collections.shuffle(array);
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// 发牌
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// 三个选手
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ArrayList<String> linQingXia = new ArrayList<String>();
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ArrayList<String> fengQingYang = new ArrayList<String>();
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ArrayList<String> liuYi = new ArrayList<String>();
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// 底牌
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ArrayList<String> diPai = new ArrayList<String>();
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for (int x = 0; x < array.size(); x++) {
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if (x >= array.size() - 3) {
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diPai.add(array.get(x));
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} else if (x % 3 == 0) {
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linQingXia.add(array.get(x));
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} else if (x % 3 == 1) {
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fengQingYang.add(array.get(x));
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} else if (x % 3 == 2) {
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liuYi.add(array.get(x));
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}
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}
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// 看牌
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lookPoker("林青霞", linQingXia);
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lookPoker("风清扬", fengQingYang);
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lookPoker("刘意", liuYi);
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lookPoker("底牌", diPai);
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}
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// 写一个功能实现遍历
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public static void lookPoker(String name, ArrayList<String> array) {
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System.out.print(name + "的牌是：");
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for (String s : array) {
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System.out.print(s + " ");
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}
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System.out.println();
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}
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}

‎day18/code/day18_Collections/src/cn/itcast_04/PokerDemo.java

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package cn.itcast_04;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.HashMap;
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import java.util.TreeSet;
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/*
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* A:创建一个HashMap集合
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* B:创建一个ArrayList集合
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* C:装牌
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* D:洗牌
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* E:发牌
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* F:看牌
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*/
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public class PokerDemo {
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public static void main(String[] args) {
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// 创建一个HashMap集合
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HashMap<Integer, String> hm = new HashMap<Integer, String>();
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// 创建一个ArrayList集合
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ArrayList<Integer> array = new ArrayList<Integer>();
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// 存储牌
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// 定义花色数组
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String[] colors = { "♠", "♥", "♣", "♦" };
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// 定义点数数组
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String[] numbers = { "3", "4", "5", "6", "7", "8", "9", "10", "J", "Q",
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"K", "A", "2" };
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// 定义一个索引
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int key = 0;
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for (String number : numbers) {
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for (String color : colors) {
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String value = color.concat(number);
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hm.put(key, value);
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array.add(key);
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key++;
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}
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}
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hm.put(key, "小王");
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array.add(key);
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key++;
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hm.put(key, "大王");
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array.add(key);
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// 洗牌
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Collections.shuffle(array);
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// 发牌
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TreeSet<Integer> caoCao = new TreeSet<Integer>();
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TreeSet<Integer> liuBei = new TreeSet<Integer>();
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TreeSet<Integer> sunQuan = new TreeSet<Integer>();
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TreeSet<Integer> diPai = new TreeSet<Integer>();
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for (int x = 0; x < array.size(); x++) {
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if (x >= array.size() - 3) {
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diPai.add(array.get(x));
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} else if (x % 3 == 0) {
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caoCao.add(array.get(x));
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} else if (x % 3 == 1) {
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liuBei.add(array.get(x));
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} else if (x % 3 == 2) {
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sunQuan.add(array.get(x));
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}
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}
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// 看牌
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lookPoker("曹操", caoCao, hm);
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lookPoker("刘备", liuBei, hm);
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lookPoker("孙权", sunQuan, hm);
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lookPoker("底牌", diPai, hm);
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}
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// 写一个功能实现遍历
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public static void lookPoker(String name, TreeSet<Integer> ts,
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HashMap<Integer, String> hm) {
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System.out.print(name + "的牌是：");
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for (Integer key : ts) {
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String value = hm.get(key);
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System.out.print(value + " ");
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}
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System.out.println();
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}
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}

‎day18/code/day18_Map_HashMap_TreeMap/.classpath

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<?xml version="1.0" encoding="UTF-8"?>
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<classpath>
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<classpathentry kind="src" path="src"/>
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<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.7"/>
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<classpathentry kind="output" path="bin"/>
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</classpath>

‎day18/code/day18_Map_HashMap_TreeMap/.project

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<?xml version="1.0" encoding="UTF-8"?>
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<projectDescription>
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<name>day18_Map_HashMap_TreeMap</name>
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<comment></comment>
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<projects>
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</projects>
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<buildSpec>
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<buildCommand>
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<name>org.eclipse.jdt.core.javabuilder</name>
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<arguments>
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</arguments>
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</buildCommand>
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</buildSpec>
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<natures>
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<nature>org.eclipse.jdt.core.javanature</nature>
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</natures>
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</projectDescription>

‎day18/code/day18_Map_HashMap_TreeMap/.settings/org.eclipse.jdt.core.prefs

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eclipse.preferences.version=1
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org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
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org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.7
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org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
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org.eclipse.jdt.core.compiler.compliance=1.7
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org.eclipse.jdt.core.compiler.debug.lineNumber=generate
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org.eclipse.jdt.core.compiler.debug.localVariable=generate
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org.eclipse.jdt.core.compiler.debug.sourceFile=generate
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org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
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org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
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org.eclipse.jdt.core.compiler.source=1.7

‎day18/code/day18_Map_HashMap_TreeMap/bin/cn/itcast_01/MapDemo.class

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‎day18/code/day18_Map_HashMap_TreeMap/bin/cn/itcast_01/MapDemo2.class

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‎day18/code/day18_Map_HashMap_TreeMap/bin/cn/itcast_01/MapDemo3.class

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‎day18/code/day18_Map_HashMap_TreeMap/bin/cn/itcast_01/MapDemo4.class

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‎day18/code/day18_Map_HashMap_TreeMap/bin/cn/itcast_02/HashMapDemo.class

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‎day18/code/day18_Map_HashMap_TreeMap/bin/cn/itcast_02/HashMapDemo2.class

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‎day18/code/day18_Map_HashMap_TreeMap/bin/cn/itcast_02/HashMapDemo3.class

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‎day18/code/day18_Map_HashMap_TreeMap/bin/cn/itcast_02/HashMapDemo4.class

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‎day18/code/day18_Map_HashMap_TreeMap/bin/cn/itcast_02/Student.class

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‎day18/code/day18_Map_HashMap_TreeMap/bin/cn/itcast_03/LinkedHashMapDemo.class

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‎day18/code/day18_Map_HashMap_TreeMap/bin/cn/itcast_04/Student.class

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‎day18/code/day18_Map_HashMap_TreeMap/bin/cn/itcast_04/TreeMapDemo.class

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‎day18/code/day18_Map_HashMap_TreeMap/bin/cn/itcast_04/TreeMapDemo2$1.class

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‎day18/code/day18_Map_HashMap_TreeMap/bin/cn/itcast_04/TreeMapDemo2.class

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‎day18/code/day18_Map_HashMap_TreeMap/bin/cn/itcast_05/ArrayListAndHashMapTest.class

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‎day18/code/day18_Map_HashMap_TreeMap/bin/cn/itcast_05/HashMapAndArrayListTest.class

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‎day18/code/day18_Map_HashMap_TreeMap/bin/cn/itcast_05/HashMapTest.class

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‎day18/code/day18_Map_HashMap_TreeMap/bin/cn/itcast_05/TreeMapTest.class

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‎day18/code/day18_Map_HashMap_TreeMap/bin/cn/itcast_06/HashtableDemo.class

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