如下代码:
init()是如何调用start()方法启动线程的?
import java.applet.*;
import java.awt.*;
public class MyThread extends Applet implements Runnable {
int x = 0,y = 5;
Thread Scrollwords = null;
public void init() {
setFont(new Font("TimeRomen",Font.BOLD,16));
}
public void start() {
if(Scrollwords==null) {
Scrollwords = new Thread(this);
Scrollwords.start();
}
}
public void run() {
while(Scrollwords!=null) {
x=x+1;
y=y+1;
if(x>200)
x=0;
if(y>100)
y=10;
repaint();
try {
Thread.sleep(20);
}
catch(InterruptedException e){e.printStackTrace();}
}
}
public void paint(Graphics g) {
g.drawString("Here is big club", x, y);
}
public void stop(){
Thread.yield();
Scrollwords = null;
}
}
init()是如何调用start()方法启动线程的?
import java.applet.*;
import java.awt.*;
public class MyThread extends Applet implements Runnable {
int x = 0,y = 5;
Thread Scrollwords = null;
public void init() {
setFont(new Font("TimeRomen",Font.BOLD,16));
}
public void start() {
if(Scrollwords==null) {
Scrollwords = new Thread(this);
Scrollwords.start();
}
}
public void run() {
while(Scrollwords!=null) {
x=x+1;
y=y+1;
if(x>200)
x=0;
if(y>100)
y=10;
repaint();
try {
Thread.sleep(20);
}
catch(InterruptedException e){e.printStackTrace();}
}
}
public void paint(Graphics g) {
g.drawString("Here is big club", x, y);
}
public void stop(){
Thread.yield();
Scrollwords = null;
}
}
import java.applet.*;
import java.awt.*; public class MyThread extends Applet implements Runnable {
int x = 0,y = 5;
Thread Scrollwords = null; public void init() {
setFont(new Font("TimeRomen",Font.BOLD,16));
} public void start() {
if(Scrollwords==null) {
Scrollwords = new Thread(this);
Scrollwords.start();
}
} public void run() {
while(Scrollwords!=null) {
x=x+1;
y=y+1;
if(x>200)
x=0;
if(y>100)
y=10;
repaint();
try {
Thread.sleep(20);
}
catch(InterruptedException e){e.printStackTrace();}
}
} public void paint(Graphics g) {
g.drawString("Here is big club", x, y);
} public void stop(){
Thread.yield();
Scrollwords = null;
}
}
start()
stop()
destroy()
是Applet的生命周期,在init()方法后,系统自动调用start()方法,
或者当用户从其它页面转到包含applet的页面时,该方法也被调用。