String input validation java

Validating string input java

boolean quit = false;
do{ // change your while by this

    // your own stuff here


    // then after all your program stuff
    boolean choiceIsOK = false;
    do{
    String userinput = sc.next();
    char choice = userinput.toLowerCase().charAt(0);
    switch(choice){
    case 'y':
        // case y, do nothing, you could even remove that case.
        choiceIsOK = true;
        break;
    case 'n':
        // case n, do something here
        choiceIsOK = false;
        quit = true;
        break;
    default:
        // error or warning
        System.out.println("Type Y or N to respectively continue or quit");
        break;
    }
    }while(!choiceIsOK);
}while (!quit);

Source: stackoverflow.com

Similar codes

0 vote176 views1 answer
Android java get value from listview item
Java
0 vote187 views1 answer
My animal list
Java
0 vote180 views1 answer
Spring boot jackson infinite recursion
Java
-1 vote185 views1 answer
Local inner class in java
Java
1 vote233 views1 answer
How to check java path in mac
Java
1 vote186 views7 answers
Java to python
Java
3 votes232 views2 answers
File to image javafx
Java
2 votes181 views1 answer
How to format ddmmmyyyy to ddmmyy in java
Java
0 vote287 views1 answer
How to return arraylist as array in java
Java
8 votes215 views1 answer
Java convert a string to char[]
Java