java - 意外的输出...这个输出无论如何都不是我所期望的。这是什么

Question

我希望给定的代码在 src 文件夹中名为 OutFile.txt 的文本文件中写入以下内容(并且该文件的副本存在于项目的主目录中，其中存在 src 和 res 等其他文件夹)本项目简介:

Value at: 0 = 0
Value at: 1 = 1
Value at: 2 = 2

但它不会在文件中写入任何内容。并在控制台中给出以下输出:

0
0

0
0
0

代码:-

package exception_handling_1;

//Note: This class won't compile by design!
import java.io.FileWriter;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;

public class ListOfNumbers {

 private List<Integer> list;
 private static final int SIZE = 3;

 public ListOfNumbers () {
     list = new ArrayList<Integer>(SIZE);
     for (int i = 0; i < SIZE; i++) {
         list.add(new Integer(i));
     }
 }


 static PrintWriter out;

 public void writeList() {
     //PrintWriter out=null;
     try{
     out = new PrintWriter(new FileWriter("OutFile.txt"));
     for (int i = 0; i < SIZE; i++) {
         out.println("Value at: " + i + " = " + list.get(i));
     }
     }catch (Exception e){
         System.out.println("IO Exception!");
     }finally {
         out.close();
         }
 }


}

请告诉我为什么会得到这个输出。谢谢。

Answer 1

现在它工作正常，正如您猜测的输出

package com.prectice;
    import java.io.FileWriter;
    import java.io.PrintWriter;
    import java.util.ArrayList;
    import java.util.List;

    public class ListOfNumbers {

     private List<Integer> list;
     private static final int SIZE = 3;

     public ListOfNumbers () {
         list = new ArrayList<Integer>(SIZE);
         for (int i = 0; i < SIZE; i++) {
             list.add(new Integer(i));
         }
     }


     static PrintWriter out;

     public void writeList() {
         //PrintWriter out=null;
         try{
         out = new PrintWriter(new FileWriter("OutFile.txt"));
         for (int i = 0; i < SIZE; i++) {
             System.out.println("Value at: " + i + " = " + list.get(i));
         }
         }catch (Exception e){
             System.out.println("IO Exception!");
         }finally {
             out.close();
             }
     }
     public static void main (String[] args){
            ListOfNumbers list = new ListOfNumbers();
            list.writeList();
          }


    }