Java線程基礎操作

線程的常用操作

package com.wkcto.chapter07.method;
/**
 * 演示線程的基本操作
 * 			Thread.currentThread()		返回當前線程
 * 			t1.getName()					返回線程名稱, 線程默認名稱 : Thread-0 / Thread-1 
 * 			t1.setName("t1")				設置線程名稱
 * 			t1.isAlive()					判斷線程是否終止
 * 			Thread.activeCount()			活動線程的數量
 * @author 蛙課網
 *
 */
public class Test01 {
	public static void main(String[] args) {
		Thread t1 = new Thread( new Runnable() {
			@Override
			public void run() {
				for( int i = 1; i<=100; i++){
//					System.out.println("sub thread: " + i);
					System.out.println( Thread.currentThread().getName() + "==>" + i);
				}
			}
		});	
		t1.setName("t1");
		t1.start();
		
		new Thread( new Runnable() {
			@Override
			public void run() {
				for( int i = 1; i<=100; i++){
					System.out.println( Thread.currentThread().getName() + "====>" + i);
				}
			}
		},  "t2").start();
		
		System.out.println("11 : " +  Thread.activeCount() );  		//活動線程的數量
		
		//main線程
		for( int i = 1; i<=100; i++){
			System.out.println( Thread.currentThread().getName() + "------->" + i);
		}
		
		System.out.println( "t1 alive: " + t1.isAlive());
		
		System.out.println("22 : " +  Thread.activeCount() );  		//活動線程的數量
	}
}

package com.wkcto.chapter07.method;
/**
 * 守護線程
 * 		為其他線程服務的, 不能單獨運行 , 當JVM中只有守護線程時, JVM退出 
 * @author 蛙課網
 *
 */
public class Test02 {

	public static void main(String[] args) {
		Thread t1 = new Thread(new Runnable() {
			@Override
			public void run() {
				for (int i = 1; i <= 100; i++) {
					System.out.println(Thread.currentThread().getName() + "--> " + i);
				}
			}
		} , "t1");
		t1.start();
		
		Thread t2 = new Thread(new Runnable() {
			@Override
			public void run() {
				for (int i = 1; i <= 500; i++) {
					System.out.println(Thread.currentThread().getName() + "----> " + i);
				}
			}
		} , "t2");
		t2.setDaemon( true ); 		//設置線程為守護線程
		t2.start();
		
		//main線程
		for (int i = 1; i <= 100; i++) {
			System.out.println(Thread.currentThread().getName() + "==> " + i);
		}
	}

}

package com.wkcto.chapter07.method;
/**
 * 判斷線程的狀態
 * @author 蛙課網
 *
 */
public class Test03 {

	public static void main(String[] args) {
		Thread t1 = new Thread(new Runnable() {
			@Override
			public void run() {
				for (int i = 1; i <= 100; i++) {
					System.out.println(Thread.currentThread().getName() + "--> " + i);
				}
			}
		});
		
		System.out.println("111: " + t1.getState());	 //111: NEW 新建狀態,剛剛創建了線程對象	
		t1.start();
		System.out.println("222: " + t1.getState());	//222: RUNNABLE 可運行狀態,就緒狀態, 調用了start()
		
		//main線程
		for (int i = 1; i <= 300; i++) {
			System.out.println(Thread.currentThread().getName() + "--> " + i);
		}
		
		System.out.println("333: " + t1.getState()); 	//333: TERMINATED 終止狀態,線程已結束	
		
	}

}

線程的生命周期