Thread: Experiencing a run time error, don't know what the problem is

Ok, so in my GUI application, it takes a string and converts it to a number, but there's a problem.

It generates a run time error

Here's the cod]

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Season extends JFrame
		implements ActionListener, KeyListener
{
	private JTextField inputTemp, dispSeason;
	private JButton determ;
	public Season()
	{
		super("Season.java");
 
		JLabel prompt = new JLabel("Enter a temperature");
		inputTemp = new JTextField(1);
		inputTemp.addKeyListener(this);
 
		JLabel result = new JLabel("The season probably is:");
		dispSeason = new JTextField(1);
		dispSeason.setEditable(false);
 
		determ = new JButton("Determine");
		determ.addActionListener(this);
 
		Container c = getContentPane();
		c.setBackground(Color.white);
 
		JPanel p = new JPanel();
		p.setLayout(new GridLayout(4,2));
		p.add(prompt);
		p.add(inputTemp);
		p.add(result);
		p.add(dispSeason);
		p.add(determ);
		c.add(p, BorderLayout.CENTER);
 
	}
 
	public void actionPerformed(ActionEvent e)
	{
 
		int temp = Integer.parseInt(inputTemp.getText());
		checkSeason(temp);
 
	}
 
	public void keyPressed(KeyEvent e1)
	{
		int key = e1.getKeyCode();
		int temp = Integer.parseInt(inputTemp.getText());
 
		if(key == KeyEvent.VK_ENTER)
			checkSeason(temp);
	}
	public void keyTyped(KeyEvent e){}
	public void keyReleased(KeyEvent e){}
 
	public void checkSeason(int temper)
	{
 
		if(temper > 110 || temper < -5)
			dispSeason.setText("Invalid Temperature");
		else
			if(temper >= 90)
				dispSeason.setText("Summer");
		else
			if(temper >= 70 && temper <90 )
				dispSeason.setText("Spring");
		else
			if(temper >= 50 && temper <70)
				dispSeason.setText("Fall");
		else
			if(temper < 50)
				dispSeason.setText("Winter");
	}
	public static void main(String[] args)
	{
		Season sea = new Season();
		sea.setBounds(300,300,400,200);
		sea.setDefaultCloseOperation(EXIT_ON_CLOSE);
		sea.setVisible(true);
	}
}

Here's what error says:

Exception in thread "AWT-EventQueue-0" java.lang.NumberFormatException: For input string: ""
	at java.lang.NumberFormatException.forInputString(NumberFormatException.java:48)
	at java.lang.Integer.parseInt(Integer.java:470)
	at java.lang.Integer.parseInt(Integer.java:499)
	at Season.keyPressed(Season.java:49)
	at java.awt.Component.processKeyEvent(Component.java:6225)
	at javax.swing.JComponent.processKeyEvent(JComponent.java:2801)
	at java.awt.Component.processEvent(Component.java:6044)
	at java.awt.Container.processEvent(Container.java:2041)
	at java.awt.Component.dispatchEventImpl(Component.java:4630)
	at java.awt.Container.dispatchEventImpl(Container.java:2099)
	at java.awt.Component.dispatchEvent(Component.java:4460)
	at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1850)
	at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:712)
	at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:990)
	at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:855)
	at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:676)
	at java.awt.Component.dispatchEventImpl(Component.java:4502)
	at java.awt.Container.dispatchEventImpl(Container.java:2099)
	at java.awt.Window.dispatchEventImpl(Window.java:2478)
	at java.awt.Component.dispatchEvent(Component.java:4460)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

Thank you if you can help.

NumberFormatException: For input string: ""
at java.lang.NumberFormatException.forInputString(Num berFormatException.java:48)
at java.lang.Integer.parseInt(Integer.java:470)
at java.lang.Integer.parseInt(Integer.java:499)
at Season.keyPressed(Season.java:49)

Look at line 49 in Season.java where the call to parseInt is made and see why the arg for the method is ""

For example:
Integer.parseInt(inputTemp.getText());

Do this in two steps. Get the contents of the text field and validate it before trying to use it.

I did find my error. I realized in my keyPressed method I should have out the parseInt under the if condition.

Thanks for the help!