系列十四、while & do...while & switch模板代码

一、while & do...while & switch模板代码

1.1、while

/**
 * 需求：使用while循环打印5遍Hello World!
 */
@Test
public void print5() {
	int i = 1;
	while (i <= 5) {
		System.out.println("Hello World! " + LocalDateTime.now());
		// 线程休眠（单位：秒）
		try { TimeUnit.SECONDS.sleep(1); } catch (Exception e) {e.printStackTrace();}
		i++;
	}
}

1.2、do...while

/**
 * 需求：使用do...while循环打印10遍你好世界!
 */
@Test
public void print10() {
	int i = 1;
	do {
		System.out.println("你好世界! " + LocalDateTime.now());
		// 线程休眠（单位：秒）
		try { TimeUnit.SECONDS.sleep(1); } catch (Exception e) {e.printStackTrace();}
		i++;
	} while (i <= 10);
}

1.3、switch

/**
 * 根据输入的weekDay，输出具体的日期信息
 */
@Test
public void switchDateTest() {
	// Monday、Tuesday、Wednesday、Thursday、Friday、Saturday、Sunday
	String weekDay = "Wednesday2";
	switch (weekDay) {
		case "Monday":
			System.out.println("今天星期一");
			break;
		case "Tuesday":
			System.out.println("今天星期二");
			break;
		case "Wednesday":
			System.out.println("今天星期三");
			break;
		case "Thursday":
			System.out.println("今天星期四");
			break;
		case "Friday":
			System.out.println("今天星期五");
			break;
		case "Saturday" :
			System.out.println("今天星期六");
			break;
		case "Sunday":
			System.out.println("今天星期日");
			break;
		default:
			System.out.println("日期不对");
	}
}