Branching Statements(switch, jump statement: break, continue and return)

switch statement

The switch statement is a multi way branch statement. It provides an easy way to dispatch execution to different parts of code based on the value of the expression.

Syntax:

switch (expression)
{
  case value1:
    statement 1;
    break;
  case value2:
    statement 2;
    break;
  .
  .
  case valueN:
    statementN;
    break;
  default:
    statementDefault;
}

Example:-

class Casedemo 
{ 
    public static void main(String args[]) 
    { 
        int i = 9; 
        switch (i) 
        { 
        case 0: 
            System.out.println("i is zero."); 
            break; 
        case 1: 
            System.out.println("i is one."); 
            break; 
        case 2: 
            System.out.println("i is two."); 
            break; 
        default: 
            System.out.println("i is greater than 2."); 
        } 
    } 
} 
Output:-
i is greater than 2.
jump statement:-
java supports three jump statement: break, continue and return. These three statements transfer control to other part of the program.
Break:-
In Java, break is majorly used for:
Terminate a sequence in a switch statement (discussed above).
To exit a loop.
Used as a “civilized” form of goto.

Syntax:
label:
{
  statement1;
  statement2;
  statement3;
  .
  .
}



Example:-

class Demo 
{ 
    public static void main(String args[]) 
    { 
        // Initially loop is set to run from 0-9 
        for (int i = 0; i < 10; i++) 
        { 
            // terminate loop when i is 5. 
            if (i == 5) 
                break; 
  
            System.out.println("i: " + i); 
        } 
        System.out.println("Loop complete."); 
    } 
} 

Output:-
i: 0
i: 1
i: 2
i: 3
i: 4
Loop complete.
Continue:-
Sometimes it is useful to force an early iteration of a loop. That is, you might want to continue running the loop but stop processing the remainder of the code in its body for this particular iteration. This is, in effect, a goto just past the body of the loop, to the loop’s end. The continue statement performs such an action.


Example:-
class Demo 
{ 
    public static void main(String args[]) 
    { 
        for (int i = 0; i < 10; i++) 
        { 
            
            if (i%2 == 0) 
                continue; 
                  System.out.print(i + " "); 
        } 
    } 
} 

Output:-
1 3 5 7 9 
return:-
The return statement is used to explicitly return from a method. That is, it causes a program control to transfer back to the caller of the method.
Example:-
class Return 
{ 
    public static void main(String args[]) 
    { 
        boolean t = true; 
        System.out.println("Before the return."); 
      
        if (t) 
            return; 
          System.out.println("This won't execute."); 
    } 
}

output:- 
Before the return.