突然有人问起逻辑运算符，再经参考发现原来有个重大思考误区，故留个代码输出加深印象。。。

public class LogicOpTest {	public static void main(String[] args) {		Expression[] exps = new Expression[]{ Expression.FALSE, Expression.TRUE };		for(int i=0, j=0;;){			if(i

输出结果：

Expression: FALSE 

Expression: FALSE  Result: & false Expression: FALSE  Result: && false Expression: FALSE  Expression: FALSE  Result: | false Expression: FALSE  Expression: FALSE  Result: || false Expression: FALSE  Expression: TRUE Result: & false Expression: FALSE  Result: && false Expression: FALSE  Expression: TRUE Result: | true Expression: FALSE  Expression: TRUE Result: || true Expression: TRUE Expression: FALSE  Result: & false Expression: TRUE Expression: FALSE  Result: && false Expression: TRUE Expression: FALSE  Result: | true Expression: TRUE Result: || true Expression: TRUE Expression: TRUE Result: & true Expression: TRUE Expression: TRUE Result: && true Expression: TRUE Expression: TRUE Result: | true Expression: TRUE Result: || true

【20130904更新】扩充null值的对比

public class LogicOpTest {	public static void main(String[] args) {		Expression[] exps = new Expression[]{ 			Expression.FALSE, Expression.TRUE, Expression.NULL 		};		for(int i=0, j=0;;){			if(i

输出结果：

Expression: FALSE 

Expression: FALSE  Result: & false Expression: FALSE  Result: && false Expression: FALSE  Expression: FALSE  Result: | false Expression: FALSE  Expression: FALSE  Result: || false Expression: FALSE  Expression: TRUE Result: & false Expression: FALSE  Result: && false Expression: FALSE  Expression: TRUE Result: | true Expression: FALSE  Expression: TRUE Result: || true Expression: FALSE  Expression: NULL Result: & caught NullPointerException Expression: FALSE  Result: && false Expression: FALSE  Expression: NULL Result: | caught NullPointerException Expression: FALSE  Expression: NULL Result: || caught NullPointerException Expression: TRUE Expression: FALSE  Result: & false Expression: TRUE Expression: FALSE  Result: && false Expression: TRUE Expression: FALSE  Result: | true Expression: TRUE Result: || true Expression: TRUE Expression: TRUE Result: & true Expression: TRUE Expression: TRUE Result: && true Expression: TRUE Expression: TRUE Result: | true Expression: TRUE Result: || true Expression: TRUE Expression: NULL Result: & caught NullPointerException Expression: TRUE Expression: NULL Result: && caught NullPointerException Expression: TRUE Expression: NULL Result: | caught NullPointerException Expression: TRUE Result: || true Expression: NULL Result: & caught NullPointerException Expression: NULL Result: && caught NullPointerException Expression: NULL Result: | caught NullPointerException Expression: NULL Result: || caught NullPointerException Expression: NULL Result: & caught NullPointerException Expression: NULL Result: && caught NullPointerException Expression: NULL Result: | caught NullPointerException Expression: NULL Result: || caught NullPointerException Expression: NULL Result: & caught NullPointerException Expression: NULL Result: && caught NullPointerException Expression: NULL Result: | caught NullPointerException Expression: NULL Result: || caught NullPointerException