1.switch statement in Java

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In Java, the switch statement is used for flow control based on the value of an expression. It allows you to write more concise and readable code when you have multiple conditions to check against a single variable. The basic syntax of a switch statement looks like this:

syntax :

            switch (expression) {
                case value1:
                    // Code to execute if expression matches value1
                    break;
                case value2:
                    // Code to execute if expression matches value2
                    break;
                // More case statements...
                default:
                    // Code to execute if none of the cases match
            }
        

Elaborate with a simple example :

 
          
 
 /*Now we are going to design a simple code in switch case in java 
   here we will take the month number number as the input from the user  
   and then we will check each case and print the appropriate month name  
       */ 
             
            import java.util.* ; 
            public class MINtech{ 
                public static void main(String args[]){ 
                    // calling the scanner class 
                    Scanner sc = new Scanner(System.in); 
                    System.out.println("Enter Month numebr(1-12) : ") ; 
                    // taking int as a input  
                    int num = sc.nextInt(); 
                 
                   // Initializing switch condition 
                    switch(num){ 
                        // checking whether the num is equals to 1 or not  
                        case 1 : 
                            // Printing month name  
                            System.out.println("Jan"); 
                            //Using break to exit case  
                            break ; 
                        // checking whether the num is equals to 1 or not  
                        case 2 :  
                            // Printing month name  
                            System.out.println("Feb"); 
                            //Using break to exit case 
                            break; 
                         case 3 : 
                            System.out.println("Mar"); 
                            break ; 
                        case 4:  
                            System.out.println("Apr"); 
                            break; 
                         case 5 : 
                            System.out.println("May"); 
                            break ; 
                        case 6 :  
                            System.out.println("Jun"); 
                            break; 
                         case 7 : 
                            System.out.println("Jul"); 
                            break ; 
                        case 8 :  
                            System.out.println("Aug"); 
                            break; 
                         case 9 : 
                            System.out.println("Sep"); 
                            break ; 
                        case 10 :  
                            System.out.println("Oct"); 
                            break; 
                         case 11 : 
                            System.out.println("Nov"); 
                            break ; 
                        case 12 :  
                            System.out.println("Dec"); 
                            break; 
                        // default will executed if num is not matched with 
                        //the anyone of the above mentioned cases  
                        default: 
                        System.out.println("Inavalid month"); 
                        break ; 
                    } 
                } 
            } 
       
        

Output

        Enter Month numebr(1-12) : 
        3
        Mar
                
        Enter Month numebr(1-12) : 
        5
        May
                
        Enter Month numebr(1-12) : 
        12
        Dec
                
        Enter Month numebr(1-12) : 
        14
        Inavalid month

        

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