java【源码】i/o乱七八糟

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package lianxi1;import java.util.*;import java.io.*;import javax.swing.JFileChooser;public class lianxi {                                                  public static void main(String[] args) throws FileNotFoundException{ /*JFileChooser filechooser=new JFileChooser();if(filechooser.showOpenDialog(null)==JFileChooser.APPROVE_OPTION){File file=filechooser.getSelectedFile();Scanner input=new Scanner(file);while(input.hasNext()){System.out.println(input.nextLine());}input.close();}*/File file=new File("image/zhang.txt");PrintWriter output=new PrintWriter("image/zhang.txt");System.out.println(file.getAbsoluteFile());                                                                                                                      output.println("zhagh diao");output.print("zhangbo");output.close();String a=new String();String b=new String();String c=new String();Scanner input=new Scanner(file);while(input.hasNext()){a=input.next();b=input.next();c=input.next();}System.out.println(a+"\n"+b+"\n"+c);input.close();                                                                                                                                                                                                                                                                                                                                                    }}