自增概念区分

一句话:size++ 后于整体语句实行。

public class 前缀加加 {
	static  int  m( int i){
		return i++;
	}
	
	public static int getValue1(){
		int i = 1;
		try{
			i = 4;
		}finally{
			i++;
		}
		return i;
	}
	
	public static int getValue2(){
		int i = 1;
		try{
			i = 4;
		}finally{
			i++;
		}
		return i++;
	}

    public static int getValue3(){
		int i = 1;
		try{
			i = 4;
		}finally{
			++i;
		}
		return ++i;
	}

    public static int getValue4(){
		int i = 1;
		try{
			i = 4;
		}finally{
			++i;
		}
		return i;
	}    
	
	
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		System.out.println("函数m:"+m(5));  //结果为 5 
		System.out.println("getValue():"+getValue1()); //结果为 5
		System.out.println("getValue():"+getValue2());  //结果为 5
        System.out.println("getValue():"+getValue3());  //结果为 6  
		System.out.println("getValue():"+getValue4());  //结果为 5

		for(int i = 1;i <=5;i++){
			System.out.println(i);
		} //输出为 
    
        int size = 3;
		while(size-->0){		//当size作为统计次数的时候只需要了解其能够运行多少次，不必
			System.out.println("size:"+size);
		}//输出为 2 1 0
		
        System.out.println();
		
		int size1 = 3;
		while(size1>0){//当输出为3时候 进行下一次的比较此时的 size1为2 以此类推
			System.out.println("size1:"+size1--);
		} //输出为 3 2 1

		System.out.println();
		
		int size2 = 3;
		while(--size2>0){
			System.out.println("size2:"+size2);
		}//输出为 2 1 
	}
    
    
    }