Minor simplifications.

Author: RuedigerLunde

aima-core/src/main/java/aima/core/agent/impl/aprog/SimpleReflexAgentProgram.java

@@ -43,7 +43,7 @@ protected SimpleReflexAgentProgram(Set<Rule<A>> rules) {
 		this.rules = rules;
 	}
 
-	// function SIMPLE-RELEX-AGENT(percept) returns an action
+	// function SIMPLE-REFLEX-AGENT(percept) returns an action
 	@Override
 	public final Optional<A> apply(P percept) {
 		DynamicState state = interpretInput(percept);

aima-core/src/main/java/aima/core/environment/vacuum/MazeVacuumEnvironment.java

@@ -75,10 +75,10 @@ public int getYDimension() {
 	public VacuumPercept getPerceptSeenBy(Agent<?, ?> agent) {
 		VacuumPercept result = super.getPerceptSeenBy(agent);
 		String loc = getAgentLocation(agent);
-		result.setAttribute(ATT_CAN_MOVE_LEFT, canMoveLeft(loc) ? "True" : "False");
-		result.setAttribute(ATT_CAN_MOVE_RIGHT, canMoveRight(loc) ? "True" : "False");
-		result.setAttribute(ATT_CAN_MOVE_DOWN, canMoveDown(loc) ? "True" : "False");
-		result.setAttribute(ATT_CAN_MOVE_UP, canMoveUp(loc) ? "True" : "False");
+		result.setAttribute(ATT_CAN_MOVE_LEFT, canMoveLeft(loc));
+		result.setAttribute(ATT_CAN_MOVE_RIGHT, canMoveRight(loc));
+		result.setAttribute(ATT_CAN_MOVE_DOWN, canMoveDown(loc));
+		result.setAttribute(ATT_CAN_MOVE_UP, canMoveUp(loc));
 		return result;
 	}
 

aima-core/src/main/java/aima/core/environment/vacuum/RandomWalkVacuumAgent.java

@@ -5,6 +5,7 @@
 import aima.core.util.Util;
 import static aima.core.environment.vacuum.MazeVacuumEnvironment.*;
 
+import java.util.Objects;
 import java.util.Optional;
 
 /**
@@ -44,13 +45,13 @@ public Optional<Action> act(VacuumPercept percept) {
 
             // avoid obstacles
             for (int i = 0; i < 2 ; i++) {
-				if (action == ACTION_MOVE_UP && "False".equals(percept.getAttribute(ATT_CAN_MOVE_UP)))
+				if (action == ACTION_MOVE_UP && Objects.equals(percept.getAttribute(ATT_CAN_MOVE_UP), false))
 					action = ACTION_MOVE_LEFT;
-				if (action == ACTION_MOVE_LEFT && "False".equals(percept.getAttribute(ATT_CAN_MOVE_LEFT)))
+				if (action == ACTION_MOVE_LEFT && Objects.equals(percept.getAttribute(ATT_CAN_MOVE_LEFT), false))
 					action = ACTION_MOVE_DOWN;
-				if (action == ACTION_MOVE_DOWN && "False".equals(percept.getAttribute(ATT_CAN_MOVE_DOWN)))
+				if (action == ACTION_MOVE_DOWN && Objects.equals(percept.getAttribute(ATT_CAN_MOVE_DOWN), false))
 					action = ACTION_MOVE_RIGHT;
-				if (action == ACTION_MOVE_RIGHT && "False".equals(percept.getAttribute(ATT_CAN_MOVE_RIGHT)))
+				if (action == ACTION_MOVE_RIGHT && Objects.equals(percept.getAttribute(ATT_CAN_MOVE_RIGHT), false))
 					action = ACTION_MOVE_UP;
 				else
 					break;

aima-core/src/main/java/aima/core/search/informed/AStarSearch.java

@@ -38,7 +38,7 @@ public AStarSearch(QueueSearch<S, A> impl, ToDoubleFunction<Node<S, A>> h) {
 
     // f(n) = g(n) + h(n)
     public static <S, A> EvaluationFunction<S, A> createEvalFn(ToDoubleFunction<Node<S, A>> h) {
-        return new EvaluationFunction<S, A>(h) {
+        return new EvaluationFunction<>(h) {
             @Override
             public double applyAsDouble(Node<S, A> node) {
                 return node.getPathCost() + this.h.applyAsDouble(node);

aima-core/src/main/java/aima/core/search/informed/GreedyBestFirstSearch.java

@@ -35,7 +35,7 @@ public GreedyBestFirstSearch(QueueSearch<S, A> impl, ToDoubleFunction<Node<S, A>
 
 	// f(n) = h(n)
 	public static <S, A> EvaluationFunction<S, A> createEvalFn(ToDoubleFunction<Node<S, A>> h) {
-		return new EvaluationFunction<S, A>(h) {
+		return new EvaluationFunction<>(h) {
 			@Override
 			public double applyAsDouble(Node<S, A> node) {
 				return this.h.applyAsDouble(node);