当我们需要跳出或结束多重循环时，除了在每一个循环体后面加一个break（continue）外，还可以通过label（标号）跳出多重循环（有点类似与goto语句），如下例：

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		int amount = in.nextInt();
		//使用label（标号）跳出多重循环
		OUT:
		for (int one = 0; one <= amount; ++one) {
			for (int five = 0; five <= amount / 5; ++five) {
				for (int ten = 0; ten <= amount / 10; ++ten) {
					for (int twenty = 0; twenty <= amount / 20; ++twenty) {
						if (one + five * 5 + ten * 10 + twenty * 20 == amount) {
							System.out.println(one + "张1元，" + five + "张5元，" + ten + "张10元，" + twenty + "张20元。");
							break OUT;  //此break可以跳出整个多重循环
						}
					}
				}
			}
		}

	}

}