jsp switch开关语句用法

switch  开关声明允许你选择一组语句中运行的一种选择,基于代码的返回值一个表达式。

switch (expression) {
case value_1 :

     statement (s);
     break;
case value_2 :
     statement (s);
     break;
  .
  .
  .
case value_n :
     statement (s);
     break;
default:
     statement (s);
}

实例测试

public class mainclass {

  public static void main(string[] args) {
    int i = 1;
    switch (i) {
    case 1 :
        system.out.println("one.");
        break;
    case 2 :
        system.out.println("two.");
        break;
    case 3 :
        system.out.println("three.");
        break;
    default:
        system.out.println("you did not enter a valid value.");
    }
  }

方法二 字符

public class mainclass {
 
  public static void main(string[] args) {
    char yesno = 'n';

    switch(yesno) {
      case 'n': case 'n':
           system.out.println("no selected");
           break;
      case 'y': case 'y':
           system.out.println("yes selected");
           break;
    }
  }
}

方法三

public class main {

  public static void main(string[] args) {
    int i = 0;
    switch (i) {

    case 0:
      system.out.println("i is 0");
    case 1:
      system.out.println("i is 1");
    case 2:
      system.out.println("i is 2");
    default:
      system.out.println("free flowing switch example!");
    }
  }
}
/*
i is 0
i is 1
i is 2
free flowing switch example!
*/