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 votes253 views2 answers
Adjust font scale in android studio
Java
0 vote275 views1 answer
Comvertir a java
Java
0 vote289 views1 answer
What is return method in java
Java
0 vote277 views1 answer
Android conditional api level
Java
4 votes262 views2 answers
Java run cmd
Java
1 vote292 views1 answer
String array into LinkedList java
Java
0 vote314 views1 answer
Spring org.springframework.stereotype not visible
Java Spring
16 votes264 views5 answers
Converting char array to string
Java
0 vote290 views1 answer
Java newinstance alternative
Java
0 vote290 views2 answers
Setbackground java
Java