java 多線程順序打印ABC

public class Main {

	public static String lock = "A";
	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Thread a = new A();
		Thread b = new B();
		Thread c = new C();
		a.start();
		b.start();
		c.start();
	}
}

public class A extends Thread {

	@Override
	public void run() {
		// TODO Auto-generated method stub
		int k = 0;
		while (k < 10) {
			synchronized (Main.lock) {
				if (Main.lock.equals("A")) {
					System.out.print("A");
					k++;
					Main.lock = "B";
				}
			}
		}
	}

}

public class B extends Thread {

	@Override
	public void run() {
		// TODO Auto-generated method stub
		int k = 0;
		while (k < 10) {
			synchronized (Main.lock) {
				if (Main.lock.equals("B")) {
					System.out.print("B");
					k++;
					Main.lock = "C";
				}
			}
		}
	}
}

public class C extends Thread{
	@Override
	public void run() {
		// TODO Auto-generated method stub
		int k = 0;
		while (k < 10) {
			synchronized (Main.lock) {
				if (Main.lock.equals("C")) {
					System.out.print("C");
					k++;
					Main.lock = "A";
				}
			}
		}
	}
	
}

結果：ABCABCABCABCABCABCABCABCABCABC