printthread.java

来自「初级学习资料必读本」· Java 代码 · 共 63 行

/*
 * 1.0 code.
 */

import java.applet.Applet;
import java.awt.Graphics;
import java.awt.TextArea;

public class PrintThread extends Applet {

    java.awt.TextArea display = new java.awt.TextArea(1, 80);
    int paintCount = 0;

    public void init() {
        //Create the text area and make it uneditable.
    	display = new TextArea(1, 80);
        display.setEditable(false);

	//Set the layout manager so that the text area 
	//will be as wide as possible.
        setLayout(new java.awt.GridLayout(1,0));

	//Add the text area to the applet.
        add(display);
        validate();

        addItem("init: " + threadInfo(Thread.currentThread()));
    }

    public void start() {
        addItem("start: " + threadInfo(Thread.currentThread()));
    }

    public void stop() {
        addItem("stop: " + threadInfo(Thread.currentThread()));
    }

    public void destroy() {
        addItem("destroy: " + threadInfo(Thread.currentThread()));
    }

    String threadInfo(Thread t) {
        return "thread=" + t.getName() + ", "
               + "thread group=" + t.getThreadGroup().getName();
    }
   
    void addItem(String newWord) {
        System.out.println(newWord);
        display.appendText(newWord + "\n");
        display.repaint();
        //A hack to get the applet update() method called
        //occasionally:
        if (++paintCount % 4 == 0) {
            repaint();
        }
    }

    public void update(Graphics g) {
        addItem("update: " + threadInfo(Thread.currentThread()));
        super.update(g);
    }
}