重定向输出

package test;

import java.io.FileNotFoundException;

import java.io.PrintStream;

/**

* Created by lenovo on 2016/6/2.

*/

public class printstream {

public static void main(String[] args) throws FileNotFoundException {

PrintStream out=System.out; //保存后台的输出

PrintStream ps=new PrintStream("./log.txt"); //创建新的输出流 即下面system.out的内容会写到txt中 而不是后台

System.setOut(ps);

int age=18;

System.out.println("Age has been reset successfully! Initialization is "+age);

String sex="Female";

System.out.println("Sex has been reset successfully! Initialization is "+sex);

System.setOut(out);  //恢复原有的输出流 即SEE输出到后台 而不是txt文件中

System.out.println("SEE");

}

}