switch-case 无 break 如何打印

一、switch-case 无 break 时打印

public class Test {
     

	public static void main(String[] args) {
     
		int a = 1;
		switch (a) {
     
		case 1:
			System.out.println("1");
		case 2:
			System.out.println("2");
		}
	}

}

二、switch-case 有 break 时打印

public class Test {
     

	public static void main(String[] args) {
     
		int a = 1;
		switch (a) {
     
		case 1:
			System.out.println("1");
			break;
		case 2:
			System.out.println("2");
			break;
		}
	}

}