java语法中怎么使用switch语句

switch语句是一个多路分支语句。它提供了一种简单的方法，可以根据表达式的值将执行分派到代码的不同部分。基本上，表达式可以是byte、short、char和int原始数据类型。从JDK7开始，它还适用于枚举类型（Java中的Enums）、String类和Wrapper类。

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具体示列如下：

public class Test {
  public static void main(String[] args)
  {
    int day = 2;
    String dayType;
    String dayString;
    switch (day) {
    case 1:
      dayString = "Monday";
      break;
    case 2:
      dayString = "Tuesday";
      break;
    case 3:
      dayString = "Wednesday";
      break;
    case 4:
      dayString = "Thursday";
      break;
    case 5:
      dayString = "Friday";
      break;
    case 6:
      dayString = "Saturday";
      break;
    case 7:
      dayString = "Sunday";
      break;
    default:
      dayString = "Invalid day";
    }
    switch (day) {
    // multiple cases without break statements
    case 1:
    case 2:
    case 3:
    case 4:
    case 5:
      dayType = "Weekday";
      break;
    case 6:
    case 7:
      dayType = "Weekend";
      break;
    default:
      dayType = "Invalid daytype";
    }
    System.out.println(dayString + " is a " + dayType);
  }
}