線程併發庫（創建線程、守護線程、暫停線程）

開啓線程第一種方式：

public class test {
	public static void main(String[] args) {
		Thread t1 = new MyThread();
		t1.start(); // 開線程
		for (int i = 0; i < 100; i++)
			System.out.println(Thread.currentThread().getName() + ": B: " + i);
	}
}
class MyThread extends Thread {
	public void run() {
		for (int i = 0; i < 100; i++)
			System.out.println(Thread.currentThread().getName() + ": A: " + i);
	}
}

開啓線程第二種方式：

public class test {
	public static void main(String[] args) {
		Thread t2 = new Thread(new MyRunnable());
		t2.start(); // 開線程
		for (int i = 0; i < 100; i++)
			System.out.println(Thread.currentThread().getName() + ": B: " + i);
	}
}
class MyRunnable implements Runnable {
	public void run() {
		for (int i = 0; i < 100; i++)
			System.out.println(Thread.currentThread().getName() + ": A: " + i);
	}
}

使用匿名內部類創建子線程：

		new Thread("線程3") {	
			public void run() {
				for (int i = 0; i < 100; i++)
					System.out.println(Thread.currentThread().getName() + ": C: " + i);
			}
		}.start();

		new Thread(new Runnable() {
			public void run() {
				for (int i = 0; i < 100; i++)
					System.out.println(Thread.currentThread().getName() + ": D: " + i);
			}
		}, "線程4").start();

守護線程：

		final Thread t1 = new Thread() {
			public void run() {
				for (int i = 0; i < 5; i++) {
					System.out.println(Thread.currentThread().getName() + ": " + i);
					try {
						Thread.sleep(1000);
					} catch (InterruptedException e) {
						e.printStackTrace();
					}
				}
			}
		};
		
		Thread t2 = new Thread() {
			public void run() {
				for (int i = 0; i < 10; i++) {
					System.out.println(Thread.currentThread().getName() + ": " + i);
					try {
						Thread.sleep(1000);
					} catch (InterruptedException e) {
						e.printStackTrace();
					}
				}
			}
		};
		t2.setDaemon(true);		// 設置爲守護線程, 不單獨運行
		t1.start();		// 5次, 5秒就結束了
		t2.start();		// 10次, 需要10秒
		
		// 程序在所有非守護線程執行結束之後才結束

當前線程暫停，等待加入的線程運行結束之後再繼續：

		final Thread t1 = new Thread() {
			public void run() {
				for (int i = 0; i < 5; i++) {
					System.out.println(Thread.currentThread().getName() + ": " + i);
					try {
						Thread.sleep(1000);
					} catch (InterruptedException e) {
						e.printStackTrace();
					}
				}
			}
		};
		
		Thread t2 = new Thread() {
			public void run() {
				for (int i = 0; i < 10; i++) {
					System.out.println(Thread.currentThread().getName() + ": " + i);
					try {
						Thread.sleep(1000);
						if(i == 1)
							t1.join();		// 當前線程暫停, 等待t1運行結束之後再繼續
					} catch (InterruptedException e) {
						e.printStackTrace();
					}
				}
			}
		};
			
		t1.start();		// 5次, 5秒就結束了
		t2.start();		// 10次, 需要10秒