Java一元操作符++详解

package com.coshaho.learn;

/**
*
* OperatorLearn.java Create on 2016-11-13 下午8:38:15
*
* 类功能说明: 深入理解++操作符
*
* Copyright: Copyright(c) 2013
* Company: COSHAHO
* @Version 1.0
* @Author coshaho
*/
public class OperatorLearn
{
// 一元操作符，赋值操作符，三目操作符从右向左运算，其他操作符从左向右运算
// ++x步骤：1.返回x+1；2.执行x = x + 1；
// x++步骤：1.返回x；2.执行x = x + 1;
public static void main(String[] args)
{
int x = 1;
// 步骤1. 计算y(默认值0);
// 步骤2. (x++)返回x值给临时变量c，为1;
// 步骤3. x = x + 1，x为2;
// 步骤4. 计算x，x为2;
// 步骤5. y = 临时变量c + 2 = 1 + 2 = 3.
int y = (x++) + x;
System.out.println("x = " + x);
System.out.println("y = " + y);

x = 1;
// 步骤1. 计算y(默认值0);
// 步骤2. (++x)返回x+1值给临时变量c，为2;
// 步骤3. x = x + 1，x为2;
// 步骤4. 计算x，x为2;
// 步骤5. y = 临时变量c + 2 = 2 + 2 = 4.
y = (++x) + x;
System.out.println("x = " + x);
System.out.println("y = " + y);

x = 1;
// 步骤1. 计算y(默认值0);
// 步骤2. 计算x，为1;
// 步骤3. (++x)返回x+1值给临时变量c，为2;
// 步骤4. x = x + 1，x为2;
// 步骤5. y = 1 + c = 1 + 2 = 3.
y = x + (++x);
System.out.println("x = " + x);
System.out.println("y = " + y);

x = 1;
// 步骤1. 计算y(默认值0);
// 步骤2. 计算x，为1;
// 步骤3. (x++)返回x值给临时变量c，为1;
// 步骤4. x = x + 1，x为2;
// 步骤5. y = 1 + c = 1 + 1 = 2.
y = x + (x++);
System.out.println("x = " + x);
System.out.println("y = " + y);

x = 1;
// 1.计算x，为1；
// 2.计算(x++)返回1给临时变量c
// 3.x = x + 1，为2；
// 4.计算x = 1 + c = 1 + 1 = 2;
x += (x++);
System.out.println("x = " + x);

int[] xx = {1,3};
int i = 0;
xx[i++] *= 2;
System.out.println("xx[0] = " + xx[0] + ", xx[1] = " + xx[1]);

xx = new int[]{1,3};
i = 0;
xx[i++] = xx[i++] * 2;
System.out.println("xx[0] = " + xx[0] + ", xx[1] = " + xx[1]);

/**
* 输出
* x = 2
y = 3
x = 2
y = 4
x = 2
y = 3
x = 2
y = 2
x = 2
xx[0] = 2, xx[1] = 3
xx[0] = 6, xx[1] = 3
*/
}
}