Java Switch
Java Tutorial » Java Switch
Java switch statement executes one statement from multiple conditions and this it is like if .. else .. if sequence statement.
The switch statement works with: int, byte, short, enum types, long, string and some wrapper types like Int, Byte, Short and Long.
Syntax of Switch-case ::
switch(expression){
case val1:
//code to be executed;
break; //optional
case val2:
//code to be executed;
break; //optional
......
default:
code to be executed if all cases are not matched;
}
case val1:
//code to be executed;
break; //optional
case val2:
//code to be executed;
break; //optional
......
default:
code to be executed if all cases are not matched;
}
Switch statement executes one statement from multiple conditions, example
Example below uses the weekday number to calculate the weekday name.
Example
5 is for Friday
public class Main {
public static void main(String[] args) {
int day = 5;
switch (day) {
case 1:
System.out.println("1 is for Monday");
break;
case 2:
System.out.println("2 is for Tuesday");
break;
case 3:
System.out.println("3 is for Wednesday");
break;
case 4:
System.out.println("4 is for Thursday");
break;
case 5:
System.out.println("5 is for Friday");
break;
case 6:
System.out.println("6 is for Saturday");
break;
case 7:
System.out.println("7 is for Sunday");
break;
default: System.out.println("Our number not match with any day");
}
}
}
Output:public static void main(String[] args) {
int day = 5;
switch (day) {
case 1:
System.out.println("1 is for Monday");
break;
case 2:
System.out.println("2 is for Tuesday");
break;
case 3:
System.out.println("3 is for Wednesday");
break;
case 4:
System.out.println("4 is for Thursday");
break;
case 5:
System.out.println("5 is for Friday");
break;
case 6:
System.out.println("6 is for Saturday");
break;
case 7:
System.out.println("7 is for Sunday");
break;
default: System.out.println("Our number not match with any day");
}
}
}
5 is for Friday
Nested Switch Case statements
We can use a switch as part of the statement sequence of an outer switch. This is called a nested switch.
Example:
turbojet, vane engine, propeller
public class Main {
public static void main(String args[])
{
// nested switch case statement
char branch = 'C';
int collegeYear = 4;
switch( collegeYear )
{
case 1:
System.out.println("mathematics, physics, chemistry");
break;
case 2:
switch( branch )
{
case 'C':
System.out.println("Structure, Operating System, Java,");
break;
case 'E':
System.out.println("Processor, Memory, HDD");
break;
case 'M': System.out.println("Computer Operator, Assistant, Worker");
break;
}
break;
case 3:
switch( branch )
{
case 'C':
System.out.println("Machines, Calculations, Equals");
break;
case 'E':
System.out.println("Google design, Facebook, Instagram");
break;
case 'M':
System.out.println("Engine Internal Combustion, Mechanical Aerofoil");
break;
}
break;
case 4:
switch( branch )
{
case 'C':
System.out.println("turbojet, vane engine, propeller");
break;
case 'E':
System.out.println("carburetor, gasoline, compression");
break;
case 'M':
System.out.println("high pressure, compressor, turbine");
break;
}
break;
}
}
}
Output:public static void main(String args[])
{
// nested switch case statement
char branch = 'C';
int collegeYear = 4;
switch( collegeYear )
{
case 1:
System.out.println("mathematics, physics, chemistry");
break;
case 2:
switch( branch )
{
case 'C':
System.out.println("Structure, Operating System, Java,");
break;
case 'E':
System.out.println("Processor, Memory, HDD");
break;
case 'M': System.out.println("Computer Operator, Assistant, Worker");
break;
}
break;
case 3:
switch( branch )
{
case 'C':
System.out.println("Machines, Calculations, Equals");
break;
case 'E':
System.out.println("Google design, Facebook, Instagram");
break;
case 'M':
System.out.println("Engine Internal Combustion, Mechanical Aerofoil");
break;
}
break;
case 4:
switch( branch )
{
case 'C':
System.out.println("turbojet, vane engine, propeller");
break;
case 'E':
System.out.println("carburetor, gasoline, compression");
break;
case 'M':
System.out.println("high pressure, compressor, turbine");
break;
}
break;
}
}
}
turbojet, vane engine, propeller
java switch case, string, enum, case or, expression, break, constant expression required, multiple, case, instanceof, case enum
Java Switch - java
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