simple menu base program java using while loop code example

Example 1: How to make a Java Main Menu Loop after using a case

int choiceentry;

do {
    System.out.println("Enter \"1\", \"2\" or \"3\"");
    choiceentry = scanchoice.nextInt();

    switch (choiceentry)
    {
        case 1:
            // do something
            break;
        case 2: 
            // ..something else
            break;
        case 3: 
            // .. exit program
            break;
        default:
            System.out.println("Choice must be a value between 1 and 3.");
    }   
} while (choiceentry != 3);

Example 2: How to make a Java Main Menu Loop after using a case

//set choiceentry to -1, this will make it to enter while loop
     int choiceentry = -1

    while(choiceentry < 1 || choiceentry > 3){

            System.out.println("Enter \"1\", \"2\", \"3\" or \"4\"");
            if(scanchoice.hasNextInt())
            choiceentry = scanchoice.nextInt();

    }

     switch(choiceentry){
        case 1:
           //do logic
           break;
        case 2:
           //do logic
           break;
        case 3:
           //do logic
           break;
   }