sender.java

矩阵乘法的计算程序

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

public class Sender extends Applet implements ActionListener 
{
	private String myName;
	private TextField nameField;
	private TextArea status;
	private String newline;
	
	public void init()
	{
		GridBagLayout gridBag=new GridBagLayout();
		GridBagConstraints c=new GridBagConstraints();
		setLayout(gridBag);
		
		Label receiverLabel=new Label("Receiver name:",Label.RIGHT);
		gridBag.setConstraints(receiverLabel,c);
		add(receiverLabel);
		
		nameField=new TextField(getParameter("RECEIVERNAME"),10);
		c.fill=GridBagConstraints.HORIZONTAL;
		gridBag.setConstraints(nameField,c);
		add(nameField);
		nameField.addActionListener(this);
		
		Button button=new Button("Send message");
		c.gridwidth =GridBagConstraints.REMAINDER ;//行结束
		c.anchor =GridBagConstraints.WEST;
		c.fill =GridBagConstraints.NONE;
		gridBag.setConstraints(button,c);
		add(button);
		button.addActionListener(this);
		
		status=new TextArea(5,60);
		status.setEditable(false);
		c.anchor =GridBagConstraints.CENTER ;
		c.fill =GridBagConstraints.BOTH ;
		c.weightx =1.0;
		c.weighty =1.0;
		gridBag.setConstraints(status,c);
		add(status);
		
		myName=getParameter("NAME");
		Label senderLabel=new Label("(My name is"+myName+".)",Label.CENTER );
		//c.weightx =0;//为什么必须设
		//c.weighty =0;
		gridBag.setConstraints(senderLabel,c);
		add(senderLabel);
		
		newline=System.getProperty("line.separator");
	}
	
	public void actionPerformed(ActionEvent event){
		Applet receiver=null;
		String receiverName=nameField.getText();
		receiver=getAppletContext().getApplet(receiverName);//从网页中获取指定名称的小应用程序
		if(receiver !=null){
			if(!(receiver instanceof Receiver)){
				status.append("Found applet named"+receiverName+","+"but it's not a Receiver objesct"+newline);
			}else{
				status.append("Found applet named"+receiverName+newline+" sending message to it."+newline);
				((Receiver)receiver).processRequestFrom(myName);
			}
		}else{
					 status.append("Couldn't find any applet named"+receiverName+"."+newline);
				 }
		
	}
	
	public Insets getInsets(){
		return new Insets(3,3,3,3);
	}
	

	public void paint(Graphics g){
		g.drawRect(0,0,getSize().width-1,getSize().height-1);
	}
	
	public String getAppletInfo(){
		return "Sender by Dong,li";
	}
}