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

7 votes131 views1 answer
How to reverse order of arraylist
Java
0 vote161 views1 answer
Menuitemcompat getactionview is deprecated in android
Java
8 votes134 views1 answer
Alertdialog show in android
Java
3 votes132 views1 answer
Fibunacci java
Java
4 votes177 views3 answers
Creating a 2d arraylist in java
Java
8 votes223 views3 answers
Printing arraylist
Java
136 votes374 views6 answers
How to generate a random number in java
Java
0 vote144 views2 answers
Java Program to Convert Milliseconds to Minutes and Seconds
Java
2 votes137 views1 answer
How to iterate through an array backwards java
Java
0 vote181 views1 answer
What went wrong: Execution failed for task ':app:processDebugMainManifest'. > Unable to make field private final java.lang.String java.io.File.path accessible: module java.base does not "opens java.io" to unnamed module @1ce90e66
Java