未完 Operators | 运算符

待看：
http://docs.oracle.com/javase/tutorial/java/nutsandbolts/operators.html

java运算符：
http://www.particle.kth.se/~lindsey/JavaCourse/Book/Part1/Java/Chapter02/operators.html




&&与&、||与|区别：
&和|既可以做两个boolean间运算符也可以做两个int间运算符；即：

引用

boolean & boolean   //逻辑与、Logical AND、Boolean AND
boolean | boolean   //逻辑或、Logical OR、 Boolean OR
int & int   //按位与
int | int   //按位或

当左右操作数为两个boolean时，&和|为Boolean Operators ；当左右操作数为int时，他们是Bitwise Operators。

作为Boolean Operators的&和|与&&和||的区别：

&&：Conditional AND、Short-circuit AND
||：Conditional OR、Short-circuit OR
&： Logical AND、Boolean AND
|： Logical OR、 Boolean OR
Conditional && will not evaluate the right-hand operand if the left-hand operand is false.
Conditional || omits the evaluation of the right-hand operand when the left-hand operand is true.
例子：
Conditional && and Logical &：

引用

public static void main(String[] args) {
		int value = 8;
		int count = 10;
		int limit = 11;
		if (++value%2==0 && ++count<limit) {
		}
		System.out.println("value: " + value);
		System.out.println("count: " + count);
	}

输出：
value: 9
count: 10

public static void main(String[] args) {
		int value = 8;
		int count = 10;
		int limit = 11;
		if (++value%2==0 & ++count<limit) {
		}
		System.out.println("value: " + value);
		System.out.println("count: " + count);
	}

输出：
value: 9
count: 11

Conditional || and Logical |：

引用

	public static void main(String[] args) {
		int value = 9;
		int count = 10;
		int limit = 11;
		if (++value%2==0 || ++count<limit) {
		}
		System.out.println("value: " + value);
		System.out.println("count: " + count);
	}

输出：
value: 10
count: 10

	public static void main(String[] args) {
		int value = 9;
		int count = 10;
		int limit = 11;
		if (++value%2==0 | ++count<limit) {
		}
		System.out.println("value: " + value);
		System.out.println("count: " + count);
	}

输出：
value: 10
count: 11