通过代码完成2个整数内容的交换

通过代码完成2个整数内容的交换

不磨叽了，直接上代码：

package com.hylink.common;

public class Swap {

	/** 
	 * @function 2个整数内容交换
	 * @author ylchou@qq.com
	 * @param args
	 */
	public static void main(String[] args) {
		//method one 不用额外的变量来交换，不过可能回溢出
		int i = 23;
		int j = 55;
		System.out.println("i,j:"+i+","+j);
		i = i + j;//右边为i和j之和  可能回溢出
		j = i - j;//右边为为i的值
		i = i - j;//右边为j的值
		System.out.println("i,j:"+i+","+j);
		
		//method two 用额外的变量来临时存储交换，不会发生溢出
		int x = 44;
		int y = 77;
		System.out.println("x,y:" + x + "," + y);
		int tmp = 0;
		tmp = x;
		x = y;
		y = tmp;
		tmp = 0;
		System.out.println("x,y:" + x + "," + y);
		System.out.println(tmp);
	}
}

console print:

i,j:23,55

i,j:55,23

x,y:44,77

x,y:77,44

0



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扩展：要是字符串交换，用method two，示例如下：

package com.hylink.common;

public class Swap {

	/** 
	 * @function 字符串内容交换
	 * @author ylchou@qq.com
	 * @param args
	 */
	public static void main(String[] args) {
		//字符串交换 用额外的变量来临时存储交换
		String str3 = "abc";
		String str4 = "xyz";
		System.out.println("str3,str4:"+str3+","+str4);
		String tmpStr = null;
		tmpStr = str3;
		str3 = str4;
		str4 = tmpStr;
		tmpStr = null;
		System.out.println("str3,str4:"+str3+","+str4);
		System.out.println(tmpStr);
	}
}

console print:

str3,str4:abc,xyz

str3,str4:xyz,abc

null