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 vote301 views1 answer
Algorithms - Max value
Java
1 vote290 views1 answer
Empty set java
Java
0 vote340 views2 answers
Has places api got deprecated???
Java
1 vote310 views1 answer
Selet all elemnts
Java
0 vote312 views2 answers
Replace everything before a character in java
Java
4 votes302 views3 answers
Array remove duplicate in java
Java
0 vote342 views1 answer
Add java 8 support to pom
Java
21 votes293 views2 answers
What does system.out.println(y + " ") result
Java
1 vote324 views1 answer
Find Minimum in Rotated Sorted Array
Java
3 votes303 views1 answer
Java get location of jar file
Java