Java是否可以直接调用Run()方法来启动一个新线程
时间：2020-02-23 14:33:58 来源:igfitidea点击:
不行，我们无法直接调用运行方法启动一个线程。
我们需要调用Start方法来创建一个新线程。
如果直接调用运行方法，它将不会创建一个新线程，它将与主要的堆栈相同。
package org.arpit.theitroad;
class CustomThread extends Thread {
public void run() {
for (int i = 0; i < 5; i++) {
try {
Thread.sleep(300);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("Thread is running :"+i);
}
}
}
public class StartThreadAgainMain {
public static void main(String[] args) {
CustomThread ct1 = new CustomThread();
CustomThread ct2 = new CustomThread();
ct1.run();
ct2.run();
}
}
运行上面的程序时，我们将得到以下输出：
Thread is running :0 Thread is running :1 Thread is running :2 Thread is running :3 Thread is running :4 Thread is running :0 Thread is running :1 Thread is running :2 Thread is running :3 Thread is running :4
正如我们在直接调用RUN方法的情况下，它不是创建新线程。
如果我们在上面的示例中使用start而不是运行：
package org.arpit.theitroad;
class CustomThread extends Thread {
public void run() {
for (int i = 0; i < 5; i++) {
try {
Thread.sleep(300);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("Thread is running :"+i);
}
}
}
public class StartThreadAgainMain {
public static void main(String[] args) {
CustomThread ct1 = new CustomThread();
CustomThread ct2 = new CustomThread();
ct1.start();
ct2.start();
}
}
运行上面的程序时，我们将得到以下输出：
Thread is running :0 Thread is running :0 Thread is running :1 Thread is running :1 Thread is running :2 Thread is running :2 Thread is running :3 Thread is running :3 Thread is running :4 Thread is running :4
不能直接调用run方法来创建线程，需要调用start方法来创建新线程。
