Java如何通过扩展Thread类创建线程？
我们可以使用两种方法来创建线程。首先是通过扩展java.lang.Thread类，第二种方法是通过创建实现java.lang.Runnable接口的类。请参阅如何通过实现Runnable接口来创建线程？
在此示例中，我们将扩展Thread类。要在线程中运行代码，我们需要run()在类中提供方法。让我们看看下面的代码。
package org.nhooo.example.lang;
public class NumberPrinter extends Thread {
private String threadName;
private int delay;
public NumberPrinter(String threadName, int delay) {
this.threadName = threadName;
this.delay = delay;
}
//启动线程时将调用run()方法。
@Override
public void run() {
for (int i = 0; i < 10; i++) {
System.out.println("Thread [" + threadName + "] = " + i);
try {
Thread.sleep(delay);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
public static void main(String[] args) {
NumberPrinter printerA = new NumberPrinter("A", 1000);
NumberPrinter printerB = new NumberPrinter("B", 750);
printerA.start();
printerB.start();
}
}我们的代码的示例结果是：
Thread [A] = 0 Thread [B] = 0 Thread [B] = 1 Thread [A] = 1 Thread [B] = 2 Thread [A] = 2 Thread [B] = 3 Thread [A] = 3 Thread [B] = 4 Thread [B] = 5 Thread [A] = 4 Thread [B] = 6 Thread [A] = 5 Thread [B] = 7 Thread [A] = 6 Thread [B] = 8 Thread [B] = 9 Thread [A] = 7 Thread [A] = 8 Thread [A] = 9