您可以使用具有以下两个
CASE语句。
case text1: case text4:{ //blah break; }请参见此示例：该代码示例计算特定月份中的天数：
class SwitchDemo { public static void main(String[] args) { int month = 2; int year = 2000; int numDays = 0; switch (month) { case 1: case 3: case 5: case 7: case 8: case 10: case 12: numDays = 31; break; case 4: case 6: case 9: case 11: numDays = 30; break; case 2: if (((year % 4 == 0) &&!(year % 100 == 0)) || (year % 400 == 0)) numDays = 29; else numDays = 28; break; default: System.out.println("Invalid month."); break; } System.out.println("Number of Days = " + numDays); }}这是代码的输出：
Number of Days = 29
贯穿：
另一个兴趣点是中断声明。每个break语句终止封闭的switch语句。控制流从切换块后的第一条语句继续。break语句是必需的，因为如果没有它们，则是switch块中的
fallthrough语句：匹配case标签之后的所有语句将按顺序执行，而不管后续case标签的表达式如何，直到遇到break语句为止。
示例代码：
public class SwitchFallThrough { public static void main(String[] args) { java.util.ArrayList<String> futureMonths = new java.util.ArrayList<String>(); int month = 8; switch (month) { case 1: futureMonths.add("January"); case 2: futureMonths.add("February"); case 3: futureMonths.add("March"); case 4: futureMonths.add("April"); case 5: futureMonths.add("May"); case 6: futureMonths.add("June"); case 7: futureMonths.add("July"); case 8: futureMonths.add("August"); case 9: futureMonths.add("September"); case 10: futureMonths.add("October"); case 11: futureMonths.add("November"); case 12: futureMonths.add("December"); default: break; } if (futureMonths.isEmpty()) { System.out.println("Invalid month number"); } else { for (String monthName : futureMonths) { System.out.println(monthName); } } }}这是代码的输出：
AugustSeptemberOctoberNovemberDecember
在switch语句中使用字符串
在Java SE 7和更高版本中，可以在switch语句的表达式中使用String对象。以下代码示例，基于名为month的字符串的值显示月份数：
public class StringSwitchDemo { public static int getMonthNumber(String month) { int monthNumber = 0; if (month == null) { return monthNumber; } switch (month.toLowerCase()) { case "january": monthNumber = 1; break; case "february": monthNumber = 2; break; case "march": monthNumber = 3; break; case "april": monthNumber = 4; break; case "may": monthNumber = 5; break; case "june": monthNumber = 6; break; case "july": monthNumber = 7; break; case "august": monthNumber = 8; break; case "september": monthNumber = 9; break; case "october": monthNumber = 10; break; case "november": monthNumber = 11; break; case "december": monthNumber = 12; break; default: monthNumber = 0; break; } return monthNumber; } public static void main(String[] args) { String month = "August"; int returnedMonthNumber = StringSwitchDemo.getMonthNumber(month); if (returnedMonthNumber == 0) { System.out.println("Invalid month"); } else { System.out.println(returnedMonthNumber); } }}该代码的输出为8。
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