1 Thread-Objekt
Java-Code
Thread t = new Thread(
new Thread(){
@Override
public void run() {
while(true){
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("1: "+Thread.currentThread().getName());
System.out.println("2: "+this.getName());
}
}
}
);
t.start();Nach dem Login kopieren
2 Ausführbare Schnittstelle
Java-Code
Thread t2 = new Thread(
new Runnable(){
@Override
public void run() {
while(true){
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("3: "+Thread.currentThread().getName());
}
}
}
);
t2.start();Nach dem Login kopieren
unten Welcher Teil des Codes wird ausgeführt?
Java-Code
//只要重写了run方法,你从构造函数传递进去的线程对象就不会在执行
new Thread(new Runnable(){
@Override
public void run() {
while(true){
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("runnable: "+Thread.currentThread().getName());
}
}
}
){
@Override
public void run() {
while(true){
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("thread: "+Thread.currentThread().getName());
}
}
}.start();Nach dem Login kopieren
Die Ausgabeergebnisse lauten wie folgt:
Protokollcode
3: Thread-2
1: Thread-1
2: Thread-0
thread: Thread-3
Nach dem Login kopieren
Der folgende Code kommt von: JAVA Die vierte Ausgabe von Programming Thoughts erklärt den Unterschied zwischen dem Hinzufügen von Threads oder nicht!
Counter1.java zeigt nicht die Leistung des Hinzufügens von Threads
Counter2i.java Das Ergebnis ist nach dem Hinzufügen von Threads ganz anders. Ich habe eine innere Klasse hinzugefügt, die Thread
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
public class Counter1 extends Applet {
private static final long serialVersionUID = 1L;
private int count = 0;
private Button onOff = new Button("Toggle"), start = new Button("Start");
private TextField t = new TextField(10);
private boolean runFlag = true;
public void init() {
add(t);
start.addActionListener(new StartL());
add(start);
onOff.addActionListener(new OnOffL());
add(onOff);
}
@SuppressWarnings("static-access")
public void go() {
while (true) {
try {
Thread.currentThread().sleep(100);
} catch (InterruptedException e) {
}
if (runFlag)
t.setText(Integer.toString(count++));
}
}
class StartL implements ActionListener {
public void actionPerformed(ActionEvent e) {
go();
}
}
class OnOffL implements ActionListener {
public void actionPerformed(ActionEvent e) {
runFlag = !runFlag;
}
}
public static void main(String[] args) {
Counter1 applet = new Counter1();
Frame aFrame = new Frame("Counter1");
aFrame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
aFrame.add(applet, BorderLayout.CENTER);
aFrame.setSize(300, 200);
applet.init();
applet.start();
aFrame.setVisible(true);
}
}Nach dem Login kopieren
Java-Code
Counter3.java erbt, der implementiert die Runnable-Schnittstelle
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
public class Counter2i extends Applet {
private static final long serialVersionUID = 1L;
private class SeparateSubTask extends Thread {
int count = 0;
boolean runFlag = true;
SeparateSubTask() {
start();
}
public void run() {
while (true) {
try {
sleep(100);
} catch (InterruptedException e) {
}
if (runFlag)
t.setText(Integer.toString(count++));
}
}
}
private SeparateSubTask sp = null;
private TextField t = new TextField(10);
private Button onOff = new Button("Toggle"), start = new Button("Start");
public void init() {
add(t);
start.addActionListener(new StartL());
add(start);
onOff.addActionListener(new OnOffL());
add(onOff);
}
class StartL implements ActionListener {
public void actionPerformed(ActionEvent e) {
if (sp == null)
sp = new SeparateSubTask();
}
}
class OnOffL implements ActionListener {
public void actionPerformed(ActionEvent e) {
if (sp != null)
sp.runFlag = !sp.runFlag; // invertFlag();
}
}
public static void main(String[] args) {
Counter2i applet = new Counter2i();
Frame aFrame = new Frame("Counter2i");
aFrame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
aFrame.add(applet, BorderLayout.CENTER);
aFrame.setSize(300, 200);
applet.init();
applet.start();
aFrame.setVisible(true);
}
}Nach dem Login kopieren
Java-Code
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
public class Counter3 extends Applet implements Runnable {
private static final long serialVersionUID = 1L;
private int count = 0;
private boolean runFlag = true;
private Thread selfThread = null;
private Button onOff = new Button("Toggle"), start = new Button("Start");
private TextField t = new TextField(10);
public void init() {
add(t);
start.addActionListener(new StartL());
add(start);
onOff.addActionListener(new OnOffL());
add(onOff);
}
@SuppressWarnings("static-access")
public void run() {
while (true) {
try {
selfThread.sleep(100);
} catch (InterruptedException e) {
}
if (runFlag)
t.setText(Integer.toString(count++));
}
}
class StartL implements ActionListener {
public void actionPerformed(ActionEvent e) {
if (selfThread == null) {
selfThread = new Thread(Counter3.this);
selfThread.start();
}
}
}
class OnOffL implements ActionListener {
public void actionPerformed(ActionEvent e) {
runFlag = !runFlag;
}
}
public static void main(String[] args) {
Counter3 applet = new Counter3();
Frame aFrame = new Frame("Counter3");
aFrame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
aFrame.add(applet, BorderLayout.CENTER);
aFrame.setSize(300, 200);
applet.init();
applet.start();
aFrame.setVisible(true);
}
}Nach dem Login kopieren
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