showdocs.java

Java与面向对象程序设计实验教学讲义.复数类的实现,复数类的复杂运算,身份证号码的分析,图形界面设计

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.net.URL;
import java.net.MalformedURLException;

public class ShowDocs extends Applet 
                          implements ActionListener {
    
    AppletContext appletContext;
    TextField urlToShow;

    public void init() {
        appletContext = getAppletContext();
       
        setLayout(new GridLayout(2,1));
        urlToShow = new TextField(100);
        Button button = new Button("Show the URL ");
        button.addActionListener(this);
        add(urlToShow);
        add(button);

     }


    public void actionPerformed(ActionEvent event) {
           
       String urlString = urlToShow.getText();
        URL url = null;
        try {
            url = new URL(urlString);
        } catch (MalformedURLException e) {
            System.err.println("Malformed URL: " + urlString);
        }

        if (url != null) {
                    
                appletContext.showDocument(url, "_blank");
            }
      
    }
}