CODEWITHSUNDEEP
javaloops
ewbrowning
ewbrowning

Reputation: 107

Java: Re-running user input in program after invalid entry (loop?)

After making an invalid entry, the invalid entry loop continues to appear in this program. I am seeking to keep asking the user for input until he/she enters valid data. Then I'd like to use that input to continue on with the program. I'm positive there's a type of loop associated with this. Thanks for your help.

identInput = JOptionPane.showInputDialog(null, "Please enter a student ID: ");
intID = Integer.parseInt(identInput);
savedIntID = Integer.parseInt(identInput);

for(x = 0; x < studentIDs.length; ++x)
{
    if(identInput.equals(studentIDs[x]))
    {
        JOptionPane.showMessageDialog(null, "The first name associated with \nStudent ID "
                + intID + " is: " + firstNames[x] + "\n" + firstNames[x] + "'s current GPA is: "
                + gPAs[x]);

        inputTruth = true;
        break;
    }
}

//The following will show up and continue to if the data is incorrect. Am not
//sure how to reuse if good data are entered.

while(inputTruth == false)
{
    JOptionPane.showInputDialog(null, "The Student ID you entered "
            + savedIntID + "\nis not valid. \nPlease enter another Student ID: ");
}

Upvotes: 0

Views: 795

Answers (3)

richard
richard

Reputation: 762

is this what you want ? 

inputTruth = false;

while(inputTruth == false)
{
  for(x = 0; x < studentIDs.length; ++x)
  {     
    if(identInput.equals(studentIDs[x]))
    {
     JOptionPane.showMessageDialog(null, "The first name associated with \nStudent ID "
       + intID + " is: " + firstNames[x] + "\n" + firstNames[x] + "'s current GPA is: " 
       + gPAs[x]);

     inputTruth = true;
     break;
   }
 }
 if (inputTruth == false) {
 identInput = JOptionPane.showInputDialog(null, "The Student ID you entered " 
  + savedIntID + "\nis not valid. \nPlease enter another Student ID: ");
  }
}

Upvotes: 1

Andreas L.
Andreas L.

Reputation: 2923

inputTruth = false;
while(inputTruth == false)
{
identInput = JOptionPane.showInputDialog(null, "Please enter a student ID: ");
intID = Integer.parseInt(identInput);
savedIntID = Integer.parseInt(identInput);

for(x = 0; x < studentIDs.length; ++x)
{
    if(identInput.equals(studentIDs[x]))
    {
        JOptionPane.showMessageDialog(null, "The first name associated with \nStudent ID "
                + intID + " is: " + firstNames[x] + "\n" + firstNames[x] + "'s current GPA is: "
                + gPAs[x]);

        inputTruth = true;
        break;
    }
}

//The following will show up and continue to if the data is incorrect. Am not
//sure how to reuse if good data are entered.

if(inputTruth == false)
{
    JOptionPane.showInputDialog(null, "The Student ID you entered "
            + savedIntID + "\nis not valid. \nPlease enter another Student ID: ");
}
}

Upvotes: 1

Sarz
Sarz

Reputation: 1976

You just Need a while loop

while(!isInputValid){
 //Take your input
 if(check == input){
   isInputValid = true;
 }else{
  //Please enter valid input try again.
 }
}

Upvotes: 1

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