不,你不能直接调用run方法来启动一个线程。您需要调用 start 方法来创建一个新线程。 如果你直接调用run方法,它不会创建一个新线程,它会和main在同一个栈中。 让我们在示例的帮助下理解:
package org.arpit.java2blog;
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();
}
}
当您运行上面的程序时,您将得到以下输出:
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
正如您所看到的,当我们直接调用 run 方法时,它并没有创建新线程。
如果您在上面的示例中使用 start 而不是 run:
package org.arpit.java2blog;
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();
}
}
当您运行上面的程序时,您将得到以下输出:
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方法创建线程,需要调用start方法创建新线程。
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