java分支结构

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if else

IfElse.java

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public class Test {

   public static void main(String args[]){
      int x = 30;

      if( x == 10 ){
         System.out.print("Value of X is 10");
      }
      else if( x == 20 ){
         System.out.print("Value of X is 20");
      }
      else if( x == 30 ){
         System.out.print("Value of X is 30");
      }
      else{
         System.out.print("这是 else 语句");
      }
   }
}

嵌套的if…else语句

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public class Test {

   public static void main(String args[]){
      int x = 30;
      int y = 10;

      if( x == 30 ){
         if( y == 10 ){
             System.out.print("X = 30 and Y = 10");
          }
       }
    }
}

switch语句

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public class Test {

   public static void main(String args[]){
      //char grade = args[0].charAt(0);
      char grade = 'C';

      switch(grade)
      {
         case 'A' :
            System.out.println("优秀"); 
            break;
         case 'B' :
         case 'C' :
            System.out.println("良好");
            break;
         case 'D' :
            System.out.println("及格");
         case 'F' :
            System.out.println("你需要继续努力");
            break;
         default :
            System.out.println("无效等级");
      }
      System.out.println("你的等级是 " + grade);
   }
}