java.lang.ThreadGroup.setMaxPriority()%uA0方法设置组的最高优先级。线程组中的线程已经具有更高的优先级不会受到影响。
声明
以下是java.lang.ThreadGroup.setMaxPriority()方法的声明
public final void setMaxPriority(int pri)
参数
-
pri%uA0-- 这是线程组的新的优先级。
返回值
此方法不返回任何值。
异常
-
SecurityException%uA0-- 如果当前线程无法修改此线程组。
例子
下面的例子显示java.lang.ThreadGroup.setMaxPriority()方法的使用。
package com.yiibai import java.lang.* public class ThreadGroupDemo implements Runnable { public static void main(String[] args) { ThreadGroupDemo tg = new ThreadGroupDemo() tg.func() } public void func() { try { // create a parent ThreadGroup ThreadGroup pGroup = new ThreadGroup("Parent ThreadGroup") // set maximum priority as 8 for Parent pGroup.setMaxPriority(Thread.MAX_PRIORITY - 2) // create a child ThreadGroup for parent ThreadGroup ThreadGroup cGroup = new ThreadGroup(pGroup, "Child ThreadGroup") // set maximum priority as 5 for child cGroup.setMaxPriority(Thread.NORM_PRIORITY) // create a thread with Priority as MAX Thread t1 = new Thread(pGroup, this) t1.setPriority(Thread.MAX_PRIORITY) System.out.println("Starting " + t1.getName() + "...") t1.start() // create another thread with Priority as MAX Thread t2 = new Thread(cGroup, this) t1.setPriority(Thread.MAX_PRIORITY) System.out.println("Starting " + t2.getName() + "...") t2.start() // display the number of active threads with actual priority System.out.println("Active threads in "" + pGroup.getName() + "" = " + pGroup.activeCount()) // block until the other threads finish t1.join() t2.join() } catch (InterruptedException ex) { System.out.println(ex.toString()) } } // implements run() public void run() { for(int i = 0i < 1000i++) { i++ } System.out.println(Thread.currentThread().getName() + " [priority = " + Thread.currentThread().getPriority() + "] finished executing.") } }
让我们来编译和运行上面的程序，这将产生以下结果：
Starting Thread-0... Starting Thread-1... Active threads in group "Parent ThreadGroup" = 2 Thread-0 [priority = 8] finished executing. Thread-1 [priority = 5] finished executing.