JUMP STATEMENTS in JAVA

JUMP STATEMENTS

                                                                                        

Java supports three jump statements: break, continue, and return. These statements transfer control to another part of your program.

1. break.

2. continue.

3. return.

1 The break statement

·         This statement is used to jump out of a loop.

·         On encountering a break statement within a loop, the execution continues with the  next statement outside the loop.

·         The remaining statements which are after the break and within the loop are skipped.

·         Break statement can also be used with the label of a statement.

·         A statement can be labeled as follows.

statementName : SomeJavaStatement

·         When we use break statement along with label as

break statementName;

An example of break statement

class break1

{

public static void main(String args[])

{

int i = 1;

while (i<=10)

{

System.out.println("\n" + i);

i++;

if (i==5)

{

break;

}

} }}

Output :

1

2

3

4

An example of break to a label

class break3

{

public static void main (String args[])

{

boolean t=true;

a:

{

b:

{

c:

{

System.out.println("Before the break");

if(t)

break b;

System.out.println("This will not execute");

}

System.out.println("This will not execute");

}

System.out.println("This is after b");

}

}

}

Output :

Before the break

This is after b

2 Continue statement

·         This statement is used only within looping statements.

·         When the continue statement is encountered, the next iteration starts.

·         The remaining statements in the loop are skipped. The execution starts from the top of loop again.

·          

The program below shows the use of continue statement.

class continue1

{

public static void main(String args[])

{

for (int i=1; i<1=0; i++)

{

if (i%2 == 0)

continue;

System.out.println("\n" + i);

}

}

}

Output :

1

3

5

7

9

3

3. The return statement

·         The last control statement is return. The return statement is used to explicitly return from a method.

·         That is, it causes program control to transfer back to the caller of the method.

·         The return statement immediately terminates the method in which it is executed.

The program below shows the use of return statement.

class Return1

{

public static void main(String args[])

{

boolean t = true;

System.out.println("Before the return.");

if(t)

return;       // return to caller

System.out.println("This won't execute.");

}

}

Output :

Before the return.