Question

我做错了什么？我真的不明白。它基本上应该显示我输入的文本，但是如果勾选复选框，它应该识别\n and \t并根据输出对它们做出响应。谢谢！

//html code is all follows 

<applet code="Echo.class" height=400 width=500></applet>
<param name="parameter" value="Echo.class">
</applet>

// this is the .java file 

import java.awt.*;
import java.applet.*;
import java.awt.event.*;

public class Echo extends Applet
{
    TextArea output;
    TextField input;
    Checkbox escape;
    Button submit;
    String s;
    boolean bool=true;
    String args;



    public void init ()
    {

        setLayout(new BorderLayout());

        final Applet Echo = this;

        s = "enter some text";
        input = new TextField(s);
        this.add(input,BorderLayout.SOUTH);
        output = new TextArea("");
        this.add(output,BorderLayout.CENTER);

        submit = new Button("button");
        this.add(submit,BorderLayout.EAST);
        submit.addActionListener(new Listener());

        escape = new Checkbox("checkbox");
        this.add(escape, BorderLayout.EAST);
        escape.addItemListener(new Listener());



    }


    public class Listener implements ActionListener, ItemListener

    {
        public  void actionPerformed(ActionEvent e)

        {
                args = this.getParameter("parameter");
                input.getText();
                output.setText();
            if (bool)
            {

                System.out.println(args.replaceAll("\\\\n", "\n").replaceAll("\\\\t","\t"));
            }
                else {
                    System.out.println(args);
                }
        }


        public void itemStateChanged(ItemEvent ie)
        {

            if(!escape.getState())

                bool=false;

        }
    }
}

Answer 1

output.setText(input.getText());

FYI。 Applet（awt）是一种相对废弃的技术。较新的JApplet（swing）也不再具有那么大的浏览器支持。

为什么我的Java Echo applet不起作用？

1 个答案: