我目前正在学习Java中的线程基础知识，并尝试编写一个简单的线程组程序。虽然我按照教程网站上的方式编写了它，但我得到了不同类型的输出。以下是我的代码，我得到了不同的输出结果。
public class ThreadGroupDemo implements Runnable {
@Override
public void run() {
System.out.println(Thread.currentThread().getName());
// get the name of the current thread.
}
public static void main(String[] args) {
ThreadGroupDemo runnable = new ThreadGroupDemo();
ThreadGroup tg1 = new ThreadGroup("Parent Group");
// Creating thread Group.
Thread t1 = new Thread(tg1, new ThreadGroupDemo(), "one");
t1.start();
t1.setPriority(Thread.MAX_PRIORITY);
Thread t2 = new Thread(tg1, new ThreadGroupDemo(), "second");
t2.start();
t2.setPriority(Thread.NORM_PRIORITY);
Thread t3 = new Thread(tg1, new ThreadGroupDemo(), "Three");
t3.start();
System.out.println("Thread Group name : " + tg1.getName());
tg1.list();
}
}
我正在获取 输出为：
Thread Group name : Parent Group
Three
java.lang.ThreadGroup[name=Parent Group,maxpri=10]
second
one
Thread[one,10,Parent Group]
Thread[second,5,Parent Group]
Thread[Three,5,Parent Group]
输出应该像这样：
one
two
three
Thread Group Name: Parent ThreadGroup
java.lang.ThreadGroup[name=Parent ThreadGroup,maxpri=10]
Thread[one,5,Parent ThreadGroup]
Thread[two,5,Parent ThreadGroup]
Thread[three,5,Parent ThreadGroup]
我不明白为什么会发生这种情况？设置优先级能够帮助解决吗？
- public int activeCount(): returns the number of active threads in this thread group.
public int activeCount()：返回此线程组中活动线程的数量。- public int activeGroupCount(): returns an estimate of the number of active groups in this thread group.
public int activeGroupCount()：返回此线程组中活动组的数量的估计值。- public int getMaxPriority(): returns the maximum priority of this thread group.
public int getMaxPriority()：返回此线程组的最大优先级。- public String getName(): returns the name of this thread group.
public String getName()：返回此线程组的名称。- public ThreadGroup getParent(): returns the parent of this thread group.
public ThreadGroup getParent()：返回此线程组的父级。- public boolean isDaemon(): tests if this thread group is a daemon thread group.
public boolean isDaemon()：测试此线程组是否为守护线程组。- public boolean isDestroyed(): tests if this thread group has been destroyed.
public boolean isDestroyed()：测试此线程组是否已被销毁。- public void setDaemon(boolean daemon): changes the daemon status of this thread group.
public void setDaemon(boolean daemon)：更改此线程组的守护程序状态。- public void setMaxPriority(int pri): sets the maximum priority of this thread group.
public void setMaxPriority(int pri)：设置此线程组的最大优先级。- public void interrupt(): interrupts all threads in this thread group.
public void interrupt()：中断此线程组中的所有线程。- public void list(): prints information about this thread group to the standard output.
public void list()：将有关此线程组的信息打印到标准输出。- protected void finalize(): destroys this thread group and all its subgroups (if any).
protected void finalize()：销毁此线程组及其所有子组（如果有）。Example: 示例：public class Test extends Thread { public static void main(String args[]) throws Exception { ThreadGroup g1 = new ThreadGroup("Parent ThreadGroup"); Thread t1 = new Thread(g1, "thread 1"); Thread t2 = new Thread(g1, "thread 2"); g1.setMaxPriority(3); ThreadGroup g2 = new ThreadGroup(g1, "Child ThreadGroup"); Thread t3 = new Thread(g2, "thread 3"); System.out.println("Thread Group Name: " + g1.getName()); g1.list(); } }Output: 输出：Thread Group Name: Parent ThreadGroup java.lang.ThreadGroup[name=Parent ThreadGroup,maxpri=3] Thread[thread 1,5,Parent ThreadGroup] Thread[thread 2,5,Parent ThreadGroup] java.lang.ThreadGroup[name=Child ThreadGroup,maxpri=3] Thread[thread 3,5,Child ThreadGroup]In this example, we have created two ThreadGroups: "Parent ThreadGroup" and "Child ThreadGroup". We have also created three threads: "thread 1", "thread 2", and "thread 3". "thread 1" and "thread - Jaimin Patel