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

-2 votes121 views1 answer
How to add a number to the ascii value of a char in java
Java
0 vote133 views1 answer
Fix all 'Implicit call to array '.toString() problems
Java
0 vote146 views1 answer
Initialize linked list in java
Java
0 vote137 views1 answer
Write a java program to merge three singly linked list elements
Java
19 votes173 views6 answers
Flutter padding
Java
0 vote217 views1 answer
Spring boot intellij auto reload
Java Spring
0 vote130 views1 answer
Is the main method compulsory in Java?
Java
0 vote172 views1 answer
Sprint jpa properties for application.yml
Java
-2 votes118 views2 answers
How to get filename without extension in java
Java
0 vote112 views1 answer
Java random number generator 4
Java