在java中如何让一个类既实现MouseListener又抛出IOException？

发布于 2024-12-18 00:53:58 字数 33 浏览 8 评论 0原文

抛出 IOException 是针对来自文件的输入。

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迷爱 2024-12-25 00:53:58

像这样的东西：

import java.awt.event.*;
import java.io.*;
class Foo implements MouseListener {
    void io() throws IOException {
        File file = new File("foo");
        FileReader fileReader = new FileReader(file);
        fileReader.read();
        // ...
    }
    @Override public void mouseClicked(MouseEvent arg0) {
        try {
            io();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
    @Override public void mouseEntered(MouseEvent arg0) {}
    @Override public void mouseExited(MouseEvent arg0) {}
    @Override public void mousePressed(MouseEvent arg0) {}
    @Override public void mouseReleased(MouseEvent arg0) {}
}

something like this:

import java.awt.event.*;
import java.io.*;
class Foo implements MouseListener {
    void io() throws IOException {
        File file = new File("foo");
        FileReader fileReader = new FileReader(file);
        fileReader.read();
        // ...
    }
    @Override public void mouseClicked(MouseEvent arg0) {
        try {
            io();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
    @Override public void mouseEntered(MouseEvent arg0) {}
    @Override public void mouseExited(MouseEvent arg0) {}
    @Override public void mousePressed(MouseEvent arg0) {}
    @Override public void mouseReleased(MouseEvent arg0) {}
}

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兲鉂ぱ嘚淚 2024-12-25 00:53:58

类不会引发异常，方法会引发异常。

public class Foo implements MouseListener {
    public void throwingUp() throws IOException {
        // ... Code that could throw IOE
    }
    // ... MouseListener impl
}

Classes don't throw exceptions, methods do.

public class Foo implements MouseListener {
    public void throwingUp() throws IOException {
        // ... Code that could throw IOE
    }
    // ... MouseListener impl
}

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懒的傷心 2024-12-25 00:53:58

类不会抛出 IOException，而方法会。您的类可以实现 MouseListener，但这些方法（mouseClicked、mousePressed 等）不能抛出 IOException。您必须将它们包装在 RuntimeException （或子类）中。例如，

   @Override
   public void mouseEntered(MouseEvent e) {
      try {
         methodThatMightThrowAnIOException();
      }
      catch (IOException ioe)
      {
         throw new RuntimeException(ioe);
      }
   }

其他方法，例如 methodThatMightThrowAnIOException()，可以抛出 IOException。

Classes do not throw IOExceptions, methods do. Your class can implement MouseListener, but those methods (mouseClicked, mousePressed etc...) cannot throw IOExceptions. You'll have to wrap them in a RuntimeException (or a subclass). e.g.

   @Override
   public void mouseEntered(MouseEvent e) {
      try {
         methodThatMightThrowAnIOException();
      }
      catch (IOException ioe)
      {
         throw new RuntimeException(ioe);
      }
   }

Other methods, like methodThatMightThrowAnIOException(), can throw IOExceptions.

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