static int activeCount()
描述 (Description)
java.lang.Thread.activeCount()方法返回当前线程的线程组中活动线程的数量。
声明 (Declaration)
以下是java.lang.Thread.activeCount()方法的声明
public static int activeCount()
参数 (Parameters)
NA
返回值 (Return Value)
此方法返回当前线程的线程组中的活动线程数。
异常 (Exception)
NA
例子 (Example)
以下示例显示了java.lang.Thread.activeCount（）方法的用法。
package com.iowiki;
import java.lang.*;
public class ThreadDemo {
public static void main(String[] args) {
Thread t = Thread.currentThread();
t.setName("Admin Thread");
// set thread priority to 1
t.setPriority(1);
// prints the current thread
System.out.println("Thread = " + t);
int count = Thread.activeCount();
System.out.println("currently active threads = " + count);
Thread th[] = new Thread[count];
// returns the number of threads put into the array
Thread.enumerate(th);
// prints active threads
for (int i = 0; i < count; i++) {
System.out.println(i + ": " + th[i]);
}
}
}
让我们编译并运行上面的程序，这将产生以下结果 -
Thread = Thread[Admin Thread,1,main]
currently active threads = 1
0: Thread[Admin Thread,1,main]
