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switch Java Keyword

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The switch is a keyword defined in the java programming language.

switch Java Keyword

     

The switch is a keyword defined in the java programming language. Keywords are basically reserved words which have specific meaning relevant to a compiler in java programming language likewise the switch keyword indicates the following : 

-- The switch statement in java language enables the user to select the execution of one of code block from a group of similar code blocks on the basis of an expression.

-- Always the switch condition must be evaluated to a char, byte, short or int. then only the execution of the switch case will start.

-- Within a switch case, a case block cannot be terminated itself i.e. it does not have any implicit ending point.  So we provide a break statement at the end of each case block to exit from the switch statement.

-- If the break statement is lacking in the switch case then the flow of execution will flow into all following case and/or default blocks. That makes senseless to use the switch case.

Example to use the Switch keyword within a class in java programming language:

switch with an int value:

int arg = <few values>;

switch (arg ){

case 1:

<statements>
<statements>

break;

case 2:

<statements>
<statements>

break;

default:

<statements>

break;

}

switch with a char value:

char arg = <few values>;

switch (arg)

{

case 'y':

case 'Y':

<statements>

break;

case 'n':

case 'N':

<statements>

break;

default:

<statements>

break;

}

 

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Posted on: November 17, 2009

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