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Switch statement

The switch statement has more alternative execution routes than the if and if-else commands. The primitive data types byte, short, char, and int are all compatible with switches. It also functions with enumerated types, the String class, and a couple of special classes that encase a few primitive types including Character, Byte, Short, and Integer.

Important points on switch statement

Switch statement

Java uses switch statements to allow the execution of a single statement under various conditions. Variables of many types, including short, byte, int, long, enum, and others, can be used with the switch statement.
The case value must be of switch expression type only.For example, if a switch statement evaluates an integer expression, the case values must be integers as well. If the switch expression is a string, so should the case values be.
The break statement is used to stop the execution of chain of statements. It's optional to use break keyword. If a break statement is not found after any paticular case then it will executes the next case.
Similar case values are not allowed to be used. If unique values are not utilised, the compiler issues a compile-time error.
Since flow is excluded from the switch statement, the final break is not technically necessary. To make editing the code simpler and less prone to error, it is advised to use breaks.
The default label for the case value is an optional feature.
You have the option to give one or N case values for a switch expression.

Syntax

 switch  (expression){

 case  value1:

     statement 1;  // your code  execute when condition 2 is true

     break;

 case  value2:

     statement 2;  // your code  execute when condition 2 is true

     break;

  default:

     statement 2;  // your code  execute when condition is false

Flow Chart

 // Decision-Making program using switch case statement

public class Student { 
	public static void main(String[] args) {  	      
        int month = 10;
        String monthName;
        switch (month) {
            case 1:  monthName = "January";
                     break;
            case 2:  monthName = "February";
                     break;
            case 3:  monthName = "March";
                     break;
            case 4:  monthName = "April";
                     break;
            case 5:  monthName = "May";
                     break;
            case 6:  monthName = "June";
                     break;
            case 7:  monthName = "July";
                     break;
            case 8:  monthName = "August";
                     break;
            case 9:  monthName = "September";
                     break;
            case 10: monthName = "October";
                     break;
            case 11: monthName = "November";
                     break;
            case 12: monthName = "December";
                     break;
            default: monthName = "Please Enter Valid Month number";
                     break;
        }
        System.out.println(monthName);
    }  
}

Output:

October

Java Enum in Switch Statement

Let's learn about enum from below point

By default, enum constants are final, static, and public.
Only interfaces can be implemented by an enum class.
In addition to constants, an enum class can also have attributes and methods.
Dot syntax is used to access enum constants.
Enum classes cannot extend other classes and cannot be used to generate new objects.

 // Java Enum program in Switch Statement

public class Student { 
	enum DayEnum {Sun, Mon, Tue, Wed, Thu, Fri, Sat}  
	public static void main(String[] args) {  		  
		DayEnum DaysName = DayEnum.Sun;       
         switch (DaysName)    
         {    
             case Sun:    
                 System.out.println("Sunday");    
                 break;    
             case Mon:    
                 System.out.println("Monday");    
                 break;    
             case Tue:    
                 System.out.println("Tuesday");    
                 break;         
             case Wed:    
                 System.out.println("Wednesday");    
                 break;    
             case Thu:    
                 System.out.println("Thursday");    
                 break;    
             case Fri:    
                 System.out.println("Friday");    
                 break;    
             case Sat:    
                 System.out.println("Saturday");    
                 break;                 	 
         }                
    }  
}

Output:

Sunday

Java Switch Statement without break statement

 // Java Enum program in Switch Statement

public class Student { 
	enum DayEnum {Sun, Mon, Tue, Wed, Thu, Fri, Sat}  
	public static void main(String[] args) {  		  
		DayEnum DaysName = DayEnum.Sun;       
         switch (DaysName)    
         {    
             case Sun:    
                 System.out.println("Sunday");    
                
             case Mon:    
                 System.out.println("Monday");    
                
             case Tue:    
                 System.out.println("Tuesday");    
                  
             case Wed:    
                 System.out.println("Wednesday");    
                 
             case Thu:    
                 System.out.println("Thursday");    
                
             case Fri:    
                 System.out.println("Friday");    
                 
             case Sat:    
                 System.out.println("Saturday");    
                          	 
         }                
    }  
}

Output:

Sunday

Monday

Tuesday

Wednesday

Thursday

Friday

Saturday

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Important points on switch statement

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