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、SundayString 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");}
}