java4.0.txt

java中的一个使用程序

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class Test extends JFrame{

	private final class JActionListener implements ActionListener {

		public void actionPerformed(ActionEvent e) {
			if(e.getActionCommand()=="Left")
				jpcenter.moveleft();
			if(e.getActionCommand()=="Right")
				jpcenter.moveright();
			if(e.getActionCommand()=="Down")
				jpcenter.movedown();
			if(e.getActionCommand()=="Up")
				jpcenter.moveup();

		}

	}
	/**
	 * @param args
	 */
	JButton jbleft=new JButton("Left");
	JButton jbright=new JButton("Right");
	JButton jbdown=new JButton("Down");
	JButton jbup=new JButton("Up");
	JPcenter jpcenter=new JPcenter();
	public Test()
	{
		this.setLayout(new BorderLayout());
		JPanel jpsouth=new JPanel();
		jpsouth.add(jbleft);
		jpsouth.add(jbright);
		jpsouth.add(jbdown);
		jpsouth.add(jbup);
		this.add(jpsouth,BorderLayout.SOUTH);
		this.add(jpcenter,BorderLayout.CENTER);
		JActionListener jactionlistener=new JActionListener();
		jbleft.addActionListener(jactionlistener);
		jbright.addActionListener(jactionlistener);
		jbdown.addActionListener(jactionlistener);
		jbup.addActionListener(jactionlistener);
		
	}
	public static void main(String[] args) {
		Test test=new Test();
		test.setSize(300,200);
		test.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		test.setLocationRelativeTo(null);
		test.setTitle("Test window");
		test.setVisible(true);

	}

}