Java case keyword

The Java case keyword is a conditional label which is used with the switch statement. It contains a block of code which is executed only when the switch value matches with the case.

A switch statement can contain multiple case labels. Each case label must hold a different value. The case label can contain the break statement that terminates the flow of the execution.

Note - The case does not hold the value of boolean, float and double type.

Syntax

switch(expression){    
case value1:    
 //code to be executed;    
 break;  //optional  
case value2:    
 //code to be executed;    
 break;  //optional  
default:     
 code to be executed if all cases are not matched;    
}   

Examples of Java case keyword

Example 1: case label holding the string value

public class CaseExample1 {

	public static void main(String[] args) {
		
		String week="Monday";
		
		switch(week)
		
		{
		case "Monday": System.out.println("Monday");
		
		}
	}
}

Test it Now

Output:

Monday

Example 2: Multiple case labels

public class CaseExample2 {

	public static void main(String[] args) {
		
		String week="Monday";
		
		switch(week)
		
		{
		case "Monday": 
			System.out.println("Monday");
			break;
		case "Tuesday":
			System.out.println("Tuesday");
			break;
		case "Wednesday":
			System.out.println("Wednesday");
			break;
		case "Thursday": 
			System.out.println("Thursday");
			break;
		case "Friday":
			System.out.println("Friday");
			break;
		case "Saturday": 
			System.out.println("Saturday");
			break;
		case "Sunday":
			System.out.println("Sunday");
			break;
		default :
			System.out.println("default");
		}
	}
}

Test it Now

Output:

Monday

Example 3: case label holding an int value

public class CaseExample3 {

	public static void main(String[] args) {
		
		int num=20;
		
		switch(num)
		
		{
		case 10: 
			System.out.println("The number is 10");
			break;
		case 20:
			System.out.println("The number is 20");
			break;
		case 30:
			System.out.println("The number is 30");
			break;
	
		default :
			System.out.println("default");
		}
	}
}

Test it Now

Example 4: case label holding switch statement

public class CaseExample4 {

	public static void main(String[] args) {
		
		String college_name="BIT";
		int department_id=102;
		
		switch(college_name)
		
		{
		case "BIT": 
			System.out.println("BIT");
			switch(department_id)
			{
			case 101:
				System.out.println("Mechanical Department");
				break;
			case 102:
				System.out.println("Computer Department");
				break;
			case 103:
				System.out.println("Civil Department");
				break;
			}
			break;
		case "ITS":
			System.out.println("ITS");
			switch(department_id)
			{
			case 101:
				System.out.println("Mechanical Department");
				break;
			case 102:
				System.out.println("Computer Department");
				break;
			case 103:
				System.out.println("Civil Department");
				break;
			}
			break;
		case "ABS":
			System.out.println("ABS");
			switch(department_id)
			{
			case 101:
				System.out.println("Mechanical Department");
				break;
			case 102:
				System.out.println("Computer Department");
				break;
			case 103:
				System.out.println("Civil Department");
				break;
			}
			break;
	
		default :
			System.out.println("default");
		}
	}
}

Test it Now

Output: