Catch Negative Number

Hi experts,
Is anyone can teach me how to catch negative input in GUI. I use NumberFormatException but it only catches String. I'd like to know in either way (try-catch and throwing exception.
private void btnEnterActionPerformed(java.awt.event.ActionEvent evt)
String amount = txtAmount.getText();
if(!amount.equals(null) && !amount.equals(""))
try
double balance = depositTransaction.deposit(Double.parseDouble(this.txtAmount.getText()));
lblBalance.setText("Your account balance is: $" + balance);
catch(NumberFormatException e)
lblBalance.setText("Invalid deposit entry");
txtAmount.setText("");
btnEnter.setEnabled(false);
Thanks heaps.

There is no exception for negative numbers, because negative numbers are not exceptional when parsing for numbers.
Don't try to handle with with an exception, or in the catch block. Try to parse the string to get a number. If it fails with a parse exception, tell the user. If it doesn't fail, then after parsing, check to see if the number is negative. If it's negative, then tell the user. You'd do this in the try block not the catch block.

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Thread Running negative number of time.

Hi All,
I wrote a program to check the effects of Thread priority, however to my surprise the output is weired the higher priority thread shows that it run negative number of time, below is the code.
package javaProg.completeReferance;
class Clicker implements Runnable
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     volatile boolean running = true;
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          t=new Thread(this);
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Processing
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Thanks a lot , I changed int click to long and its
working fine.I am wondering why the Java Platform
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How to find Negative number

can any one pls tell me how to find negative number ?
Thanks

1. One easy method is to look for the giveaway dash in front of the number, e.g. "-1" is a negative number, given the "-" instead of the "1."
2. Negative numbers can also sneakily be found by multiplying i by itself: i^2^ is a negative number.
3. Negative numbers can hide in the exponent of e as complex numbers. e.g. e^i*pi^ is a negative number.
4. If we're referring to Java here, perhaps the following could be of some use:
final int ZERO = 0;
public static void main(String[] args) {
int a = 3;
int b = -13;
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boolean lessThanZero(int n) {
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}

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My mountain lion upgrade is take long after the initial installation finish it is showing increasing negative number like -50 munites remaining

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ekas

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I am facing exactly similar issue in my project. can anyone help?

Catch Negative Number

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