Java简单从文件读取和输出

Java简单从文件读取和输出

用Scanner输入，用PrintStream输出

功能：从in.txt读入，输出到out.txt

 

代码：

package ioTest;

import java.io.*;
import java.util.Scanner;

public class TestMain {

    public static void main(String[] args) {
        try {
            Scanner sc=new Scanner(new File("in.txt"));
            PrintStream ps=new PrintStream("out.txt");
            while(sc.hasNext()){
                int a=sc.nextInt();
                System.out.print(a+" ");
                ps.println(a);
            }
            
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}

 

结果：