Java優(yōu)先級(jí)線程代碼示例
使用過Bit下載軟件的同學(xué)應(yīng)該很清楚，我們有多個(gè)下載任務(wù)同時(shí)執(zhí)行，而其中的某一個(gè)或多個(gè)是非常重要的，于是給這些任務(wù)設(shè)定一個(gè)高度優(yōu)先，以便任務(wù)可以獲取更多的帶寬盡早完成下載。Java線程的優(yōu)先級(jí)也差不多，優(yōu)先級(jí)越高排程器就會(huì)給它越多的CPU執(zhí)行時(shí)間，但請(qǐng)注意：如果有多個(gè)線程在等待一個(gè)機(jī)鎖的時(shí)候，并不是優(yōu)先級(jí)越高就可以越早執(zhí)行。
復(fù)制代碼 代碼如下:
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.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
/**
* 線程的優(yōu)先級(jí)
* 10個(gè)計(jì)數(shù)器線程分別被設(shè)置了不同的優(yōu)先級(jí)，我們通過計(jì)數(shù)器的累加來觀察優(yōu)先級(jí)的作用
* @author 五斗米
* @blog /pic/mq612
*/
public class TestMain extends JFrame {
private MyThread [] thread = null; /pic/p>
private JPanel pane = null;
private JButton startButton = null, stopButton = null; /pic/p>
public TestMain(){
super("線程的優(yōu)先級(jí)");
pane = new JPanel();
thread = new MyThread[10];
for(int i = 0; i < 10; i++){ /pic/p>
thread[i] = new MyThread(i + 1);
}
startButton = new JButton("執(zhí)行");
startButton.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e) {
for(int i = 0; i < 10; i++){
thread[i].start();
}
}
});
stopButton = new JButton("結(jié)束");
stopButton.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e) {
for(int i = 0; i < 10; i++){
thread[i].quit();
}
}
});
JPanel p = new JPanel();
p.add(startButton);
p.add(stopButton);
this.getContentPane().add(pane);
this.getContentPane().add(p, BorderLayout.NORTH);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setSize(500, 300);
this.setLocationRelativeTo(null);
this.setVisible(true);
}
/**
* 計(jì)數(shù)器線程
*/
class MyThread extends Thread{
private JTextField text = null; /pic/p>
private int i = 0; /pic/p>
private int priority = 0; /pic/p>
private JLabel label = null; /pic/p>
private boolean b = true; /pic/p>
public MyThread(int priority){
this.priority = priority;
this.setPriority(priority);
JPanel p = new JPanel();
label = new JLabel("Priority=" + priority);
text = new JTextField(12);
p.add(label);
p.add(text);
pane.add(p); /pic/p>
}
/**
* 結(jié)束線程
*/
public void quit(){
b = false;
}
public void run(){
while(b){
this.text.setText(Integer.toString(i++));
try {
this.sleep(1); /pic/p>
} catch (InterruptedException ex) {
ex.printStackTrace();
}
}
}
}
public static void main(String [] args){
new TestMain();
}
}
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