java - BufferedWriter 不写入文件

Question

我必须从用户那里获取用户的姓名和地址并将其放入文本文件中。我写了以下代码:

package selfTest.nameAndAddress;

import com.intellij.codeInsight.template.postfix.templates.SoutPostfixTemplate;

import java.io.*;
import java.util.Arrays;

/**
 * Created by 
 */
public class Test {
    public static void main(String[] args) throws IOException {
        InputStreamReader isr=new InputStreamReader(System.in);
        BufferedReader br=new BufferedReader(isr);


        //creating addressbook text file
        File fl=new File("E:/addressbook.txt");
        fl.createNewFile();

        FileReader fr=new FileReader(fl);
        BufferedReader in=new BufferedReader(fr);



        boolean eof=false;
        int inChar=0;

        String[] name=new String[2];
        String[] address=new String[2];

        int counter=0;


        do{
            FileWriter fw=new FileWriter(fl);
            BufferedWriter out=new BufferedWriter(fw);

            System.out.println("Enter "+(counter+1)+" students name "+" and address");

            name[counter]=br.readLine();
            address[counter]=br.readLine();

            out.write(name[counter]);
            System.out.println("Nmae: "+name[counter]+" ddress: "+address[counter]);
            counter++;
        }while(counter<2);
    }
}

当我运行代码时，它需要用户输入，但文本文件是空的。地址和名称未写入文本文件。如何在上面的代码中将名称和地址存储到文本文件中。

Answer 1

您创建了 BufferedWriter，但从未创建 flush或 close

这些操作才是真正写入文件的内容

---

正如@ManoDestra 在评论中指出的那样，Java 支持 try-with-resources statement ，它允许您将语句格式化为:

try(BufferedWriter out = new BufferedWriter(new FileWriter(fl))) {

由于 BufferedWriter 实现了 AutoCloseable接口(interface)，Java 将在 try block 退出时自动清理 out