自增和自減運算符

package com58.bj.java;

public class Test {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		
		int i1 =10, i2 = 20;
		int i = (i2++);
		System.out.print("i1="+i1); //10
		System.out.println("i2="+i2); //21
		i = (++i2);
		System.out.print("i1="+i1);//10
		System.out.println("i2="+i2);//22
		i =(i1--);
		System.out.print("i="+i);//10
		System.out.println("i1="+i1);//9
		i =(--i1);
		System.out.print("i="+i);//8
		System.out.println("i1="+i1);//8

	}

}

注意：

++（--）在前面時，先運算再取值

             在後面時，先取值再運算