Can we call a “case” inside another case in the same switch statement in Java?

Question

My intention is to call two cases in another case in the same switch statement,

switch (orderType) { case 1: statement 1; break; case 2: statement 2; break; case 3: **call case 1;** **Call case 2;** break; default: break;` } 

Can we do this in Java?

Answer 1

Although you cannot directly influence switch cases, you can call the parent switch method from the same case and pass different arguments. For instance,

 void foo(int param1, String param2, ...) { switch (param1) { case 0: foo(1, "some string"); break; case 1: //do something break; default: break; } } 

Answer 2

No, you cannot go to the code snippet in another switch case. However, you can extract the code into your own method, which can be called from another case:

 switch (orderType) { case 1: someMethod1(); break; case 2: someMethod2(); break; case 3: someMethod1(); someMethod2(); break; default: break; } void someMethod1() { ... } void someMethod2() { ... } 

Answer 3

You cannot just call another case block like this. However, you could wrap each of these blocks in a method and reuse them:

 private void doSomething() { // implementation } private void doSomethingElse() { // implementation } private void runSwitch(int order) { switch (orderType) { case 1: doSomething(); break; case 2: doSomethingElse(); break; case 3: doSomething(); doSomethingElse(); break; default: break; } } 

Answer 4

As others have pointed out, you can implement your switching cases inside a method that takes a parameter that matches the desired switch case. These switching cases can recursively call the same method with the required switching cases. Here is a complete working example that allows you to check if a year is a leap year or not:

 public class LeapYear { static int year = 2016; public static void main(String[] args) { leapSwitch(1); } public static void leapSwitch(int switchcase) { switch (switchcase) { case 1: { if (year % 4 == 0) { leapSwitch(2); } else { leapSwitch(5); } } break; case 2: { if (year % 100 == 0) { leapSwitch(3); } else { leapSwitch(4); } } break; case 3: { if (year % 400 == 0) { leapSwitch(4); } else { leapSwitch(5); } } break; case 4: { System.out.println(year+ " is a leap year!"); } break; case 5: { System.out.println("Not a leap year..."); } break; } } }