To ensure that only one case of a switch statement is executed, you need to use the break statement. : switch « Statements « SCJP

1. SCJP
2. Statements
3. switch

class MainClass{
 public static void main(String[] args) {
  int n = 3;
  switch(n) {
   case 1:
    System.out.println(1);
   case 2:
    System.out.println(2);
   case 3:
    System.out.println(3);
   case 4:
    System.out.println(4);
   case 5:
    System.out.println(5);
   case 6:
    System.out.println(6);
   case 7:
    System.out.println(7);
   default:
    System.out.println("default");
  }
 }
}

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default