In this article,Switch case control structure is explained in detail with examples.This control structure works same as that of cascading if else provided we use proper break statements and control the execution.
Syntax
switch(expressions)
{
case value1:
---statement1---
break;
case value 2:
---statment2---
break;
case value3:
---statement3---
break;
-----
-----
default:
----default statements---
}
Here,switch accepts expression value,such value is matched with case values linearly one after the other.which ever case value is matching with expressing value, its corresponding statements are executed with a break.
Break statements takes the control of execution directly out of switch control structure body i.e, it skips remaining cases and default case. If no case value is matching with expression value then the last default case statements are executed. (From topic Switch case control structure)
Ex
//program related to Switch case control structure--switch case.
class SwitchCaseConstruct
{
public static void main(String args[])
{
int i;
char ch;
ch='x';
switch(ch)
{
case 'x':
i=10;
break;
case 'y':
i=20; //(From topic Switch case control structure)
break;
case 'z':
i=30;
break;
default:
i=40;
}
System.out.println("Number value I is: "+i);
}
}
Output
Ex
//program related to Switch case control structure--switch case.
class SwitchCaseConstruct
{
public static void main(String args[])
{
int i;
char ch;
ch='y';
switch(ch)
{
case 'x':
i=10;
break;
case 'y':
i=20;
break;
case 'z':
i=30;
break;
default:
i=40;
}
System.out.println("Number value I is: "+i);
}
}
Output
Ex
//program related to Switch case control structure--switch case.
class SwitchCaseConstruct
{
public static void main(String args[])
{
int i;
char ch;
ch='z';
switch(ch)
{
case 'x':
i=10;
break;
case 'y':
i=20;
break;
case 'z':
i=30;
break;
default:
i=40;
}
System.out.println("Number value I is: "+i);
}
}
Output
Ex
//program related to Switch case control structure--switch case.
class SwitchCaseConstruct
{
public static void main(String args[])
{
int i;
char ch;
ch='A';
switch(ch) //(From topic Switch case control structure)
{
case 'x':
i=10;
break;
case 'y':
i=20;
break;
case 'z':
i=30;
break;
default:
i=40;
}
System.out.println("Number value I is: "+i);
}
}
Output
Special Cases
Ex
//program related to Switch case control structure--switch case.
class SwitchCaseConstruct
{
public static void main(String args[])
{
int i;
char ch;
switch(122) //accepted in java because it is int value.
{
case 'x':
i=10;
break;
case 'y':
i=20;
break;
case 122: // unicode value of z=122 so we removed "case z". If we keep both it gives duplicate value error.
i=35;
break;
default:
i=40;
}
System.out.println("Number value I is: "+i);
}
}
Output
Ex
//program related to Switch case control structure--switch case.
class SwitchCaseConstruct
{
public static void main(String args[])
{
int i;
char ch;
switch(120.5f) //do not accepted in java because it is float value.It shows error.
{
case 'x':
i=10;
break;
case 'y':
i=20;
break;
case 'z':
i=30;
break;
default:
i=40;
}
System.out.println("Number value I is: "+i);
}
}
Output
Ex
//program related to Switch case control structure--switch case.
class SwitchCaseConstruct
{
public static void main(String args[])
{
int i;
char ch;
switch((int)120.5f) //accepted in java.Float is converted to int (120) unicode value of x=120,output is case x.
{
case 'x':
i=10;
break;
case 'y':
i=20;
break;
case 'z':
i=30;
break;
default:
i=40;
}
System.out.println("Number value I is: "+i);
}
}
Output
Ex
//program related to Switch case control structure--switch case.
class SwitchCaseConstruct
{
public static void main(String args[])
{
int i;
char ch;
switch("hi") //from JDK 1.6; Switch with String is possible but we need to use double quotes.
{
case "x":
i=10;
break;
case "y":
i=20;
break;
case "z":
i=30;
break;
default:
i=40;
}
System.out.println("Number value I is: "+i);
}
}
Output
Continue to the next topic Looping control structures.
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