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Need help with an error check

  Asked By: Lourdes    Date: Jul 21    Category: Java    Views: 542

I'm trying to do an error check on a JTextField where the correct
input can be -999 to 1000. I've figured out how to check for "" &
length >4, but I'm completely lost as to how to do the "-" and check
to make sure the answer is numeric and not alpha. I'm supposed to be
using "String" methods for my error checks. Here's what I've gotten
so far:

public void actionPerformed (ActionEvent ae)
int inputTemp=0;//initialization of the sourceTemp to zero

if (tempInput.getText().equals(""))
//if user doesn't make a temp entry, show error msg
JOptionPane.showMessageDialog(null,"Please Enter Temp to
convert", "InputError", JOptionPane.ERROR_MESSAGE);

if (tempInput.getText().length()>4)
//if user enters a temp greater than 4 char, show error msg
JOptionPane.showMessageDialog(null, "Value is out of
range", "Value Error", JOptionPane.ERROR_MESSAGE);
tempInput.setText("");//set the tempInput text field to
tempInput.grabFocus();//set the focus to tempInput field
for (int i = 0; i < tempInput.getText().length(); i++)
StringBuffer tempIn = new StringBuffer(tempInput.getText());
if (tempIn.charAt(i) = "-")


//if the input is good, I have a series of if statements to do
calculations dependent upon which radio button isSelected();



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