jscrollpanedemo.java

java课程的资料以及实验的代码

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
 class JSrollPaneDemo extends JFrame{
  JLabel jl;
  public JSrollPaneDemo() {
    Container contentPane = getContentPane();
    contentPane.setLayout(new BorderLayout());

    JPanel jp = new JPanel();
    jp.setLayout(new GridLayout(20, 20));
    int b = 0;
    for(int i = 0; i < 20; i++) {
      for(int j = 0; j < 20; j++) {
        jp.add(new JButton("Button " + b));
        ++b;
      }
    }

    JScrollPane jsp = new JScrollPane(jp, 
ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED,
ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED);

    contentPane.add(jsp, BorderLayout.CENTER);
 	}
 	
  public static void main(String[] args){
  JSrollPaneDemo s=new JSrollPaneDemo();
  	s.setSize(400,300);
  	s.setVisible(true);
  }
}