Java读取和写入文件

package 第二十七个工程;import java.io.File;import java.util.Scanner;public class Domo {public static void main(String args[]) throws Exception{/*java.io.File file = new java.io.File("C:\\Users\\吴修树\\Desktop\\in.txt");if(file.exists()){ System.out.println("File already exists");System.exit(0);}java.io.PrintWriter output = new java.io.PrintWriter(file);output.print("Welcom to Java");output.close();*/java.io.File file1  = new java.io.File("C:\\Users\\吴修树\\Desktop\\out.txt");Scanner input = new Scanner(file1);while(input.hasNext()){String str = input.next();System.out.println(str);}input.close();}}