Question

这是我的代码，我尝试将数据（Ime-name，Pasma-breed，Starost-age，Teza-weight）写入arraylist然后从数组列表到.txt文件。它必须为5只狗（Pes）做，所以我已经习惯了我希望是否有人可以检查它并给我一个反馈。写入数组列表然后写入.txt文件时遇到问题。

谢谢：）

import java.io.File;
import java.io.FileWriter;
import java.util.ArrayList;
import java.util.Scanner;

class Pes {
    private String Ime;
    private String Pasma;
    private int Starost;
    private double Teza;

    public void setIme(String Ime) {
        this.Ime = Ime;
    }

    public String getIme() {
        return Ime;
    }

    public void setPasma(String Pasma) {
        this.Pasma = Pasma;
    }

    public String getPasma() {
        return Pasma;
    }

    public void setStarost(int Starost) {
        this.Starost = Starost;
    }

    public int getStarost() {
        return Starost;
    }

    public void setTeza(double Teza) {
        this.Teza = Teza;
    }

    public double getTeza() {
        return Teza;
    }

    Pes() {
        Ime = "";
        Pasma = "";
        Starost = 0;
        Teza = 0;
    }

}

public class Aplikacija {

    public static void main(String[] args) {

        new File("Psi.txt");
        Scanner input = new Scanner(System.in);

        for (int i = 0; i <= 5; i++) {
            System.out.println("Vpišite ime!");
            String Ime = input.nextLine();

            System.out.println("Vpišite pasmo!");
            String Pasma = input.nextLine();

            System.out.println("Izberite starost!");
            int Starost = input.nextInt();

            System.out.println("Izberite tezo!");
            double Teza = input.nextDouble();

            Pes Pes1 = new Pes();
            Pes1.setIme(Ime);
            Pes1.setPasma(Pasma);
            Pes1.setStarost(Starost);
            Pes1.setTeza(Teza);
            new ArrayList<Pes>();
            Pes1.add(new Pes(Ime, Pasma, Starost, Teza));
            input.close();
        }

        FileWriter writer = new FileWriter("Psi.txt");
        for (String str : arr) {
            writer.write(str);
        }
        writer.close();
    }
}

Answer 1

您需要使用BufferedWriter

FileWriter writer = new FileWriter("Psi.txt");
BufferedWriter bw = new BufferedWriter(writer);
for (String str : arr) {
    bw.write(str);
}
writer.close(); // or use try-with-resources if you use Java SE 7
bw.close();

例如，请参阅How to write in file教程。

或者您可以使用PrintWriter，这在您的情况下更简单。

PrintWriter writer = new PrintWriter("psi.txt", "UTF-8");
for (String str : arr) {
    writer.println(str);
}
writer.close();

Answer 2

试一试：

      import java.io.*;

      class class_Name
   {
     //your code 

       try
     {
       File file = new File("../filename.txt");
       FileWriter fw = new FileWriter(file.getAbsoluteFile());
       BufferedWriter writer = new BufferedWriter(fw);
         for (String str : arr) 
          {
           writer.write(str);
           }
     }
     catch(Exception e)
     {
       e.printstackTrace();
     }

   }// end of Class

Java arraylist将数据转换为.txt

2 个答案: