Unable to create while/boolean loop

Question

I am a noob to java. i am trying to create a while loop that will prompt the user after each process; as to whether or not they wish to continue. my progress looks like this.

    String proString,answer;
    char t,f,x;
    boolean exitTime;
    exitTime = false;
    proString = " Would You Like To Continue? \n";
    while(!exitTime) {
        continue;
    }
    answer = JOptionPane.showInputDialog(null," Would You Like To Continue? T/F ",HEADING,JOptionPane.INFORMATION_MESSAGE);
    x = char.parseChar(answer);

I have tried the following as well to no avail...

    Prompt= JOptonPane.showInputDialog(null,proString,HEADING,JOptionPane.QUESTION_MESSAGE); 
    input = char.parseChar(Prompt);
    if(input == "y") {
        break;
    }
    else if(input == "n") {
    }
    input = char.parseChar(Prompt);
    if(input != "y"||"n") {
        JOptionPane.showMessageDialog(null,"Invalid Input", "Error", JOptionPane.INFORMATION_MESSAGE);
    }
    else {
    }

I guess my question comes down to should i use JOptionPane.showInputDialog(...) or JOptionPane.showConfirmDialog(...) or another method? please show me how you would do this.

it would be a lot easier to help you if the code in your question was formatted properly. — Brandon
– Brandon, Commented Feb 27, 2015 at 0:17
hence 'i am a noob.' how can i create a while loop with my variables? — user4590204
– user4590204, Commented Feb 27, 2015 at 0:22
Can you provide code that compiles? As is there are many parts of your code with incorrect syntax. — TNT
– TNT, Commented Feb 27, 2015 at 0:23
i was using 'char input' because i was trying to get the question to return a char since i couldnt convert string to char...but this may be the wrong thinking... — user4590204
– user4590204, Commented Feb 27, 2015 at 0:32

Manoj Vadehra · Accepted Answer · 2016-01-15 08:07:47Z

2

What you need is to use a do-while loop:

//assume user does not want to continue.
boolean continue = false;
do
{
//process whatever you want

//ask the user
Prompt= JOptonPane.showInputDialog(null,proString,HEADING,JOptionPane.QUESTION_MESSAGE);
input = char.parseChar(Prompt);
//wait until you get a valid input
while(input != "y"||"n")
{
JOptionPane.showMessageDialog(null,"Invalid Input", "Error",JOptionPane.INFORMATION_MESSAGE);
Prompt= JOptonPane.showInputDialog(null,proString,HEADING,JOptionPane.QUESTION_MESSAGE); 
input = char.parseChar(Prompt);
}
//if user wants to continue, change your flag to true
if(input == "y") {
    continue = true;
}
//otherwise make it false
else if(input == "n") {
    continue = false;
}
while(continue); //if continue is true loop back

I haven't tested it but it should explain you the logic.

answered Jan 15, 2016 at 8:07

Manoj Vadehra

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