How to clear screen in java if the program runs in a window

[aravind12345]

I have made a Calculator and i need to add a Clear button but i don't know how to clear the screen in the program can someone tell me how i will be thank full. i have no errors or warnings.

This is the code.

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;



public class Calclator extends JFrame{
	public JButton addbutton;
	public JButton subtractbutton;
	public JButton multiplicationbutton;
	public JButton divisionbutton;
        I will insert button here
	public JTextField firstNumber;
	public JLabel firstNumberLabel;
	public JTextField secondNumber;
	public JLabel secondNumberLabel;
	public JTextField answer;
	public JLabel answerLabel;
	/*


*/
public Calclator(){
	this.setTitle("Self-Calculator");
	this.setSize(new Dimension(250,250));
	this.setLocation(MouseInfo.getPointerInfo().getLocation());
	this.setLayout(new FlowLayout());
	this.setResizable(false);
	this.addComponentListener(new ComponentListener(){

		public void componentHidden(ComponentEvent arg0) {}
		public void componentMoved(ComponentEvent arg0) {}
		public void componentResized(ComponentEvent arg0) {}
		public void componentShown(ComponentEvent arg0) {
		Calclator_load();	
		}
		
	});
			
	this.addbutton = new JButton();
	this.addbutton.setText("+");
	this.addbutton.addActionListener(new ActionListener(){
		public void actionPerformed(ActionEvent e){
			addbutton_ActionPerformed();
		}
		
	});
	
	this.subtractbutton = new JButton();
	this.subtractbutton.setText("-");
	this.subtractbutton.addActionListener(new ActionListener(){
		public void actionPerformed(ActionEvent e){
			subtractbutton_ActionPerformed();
		}
		
	});
	
	this.multiplicationbutton = new JButton();
	this.multiplicationbutton.setText("*");
	this.multiplicationbutton.addActionListener(new ActionListener(){
		public void actionPerformed(ActionEvent e){
			multiplicationbutton_ActionPerformed();
		}
		
	});
	
	this.divisionbutton = new JButton();
	this.divisionbutton.setText("/");
	this.divisionbutton.addActionListener(new ActionListener(){
		public void actionPerformed(ActionEvent e){
			divisionbutton_ActionPerformed();
		}
		
	});
	
	
	
	this.firstNumber = new JTextField();
	this.firstNumber.setText("                                    ");
	this.firstNumberLabel = new JLabel();
	this.firstNumberLabel.setText("FirstNumber");
	
	this.secondNumber = new JTextField();
	this.secondNumber.setText("                                   ");
	this.secondNumberLabel = new JLabel();
	this.secondNumberLabel.setText("SecondNumber");
	
	this.answer = new JTextField();
	this.answer.setText("                                          ");
	this.answer.setEditable(false);
	this.answerLabel = new JLabel();
	this.answerLabel.setText("Answer");
	
	
	add(addbutton);
	add(subtractbutton);
	add(multiplicationbutton);
	add(divisionbutton);
	add(firstNumberLabel);
	add(firstNumber);
	add(secondNumberLabel);
	add(secondNumber);
	add(answerLabel);
	add(answer);
}
private void Calclator_load(){
	firstNumber.setText("");
	secondNumber.setText("");
	answer.setText("");
	
}
private void addbutton_ActionPerformed(){
	try{
		int num1, num2;
		num1 = Integer.parseInt(firstNumber.getText());
		num2 = Integer.parseInt(secondNumber.getText());
		int answer2 = num1+num2;
		answer.setText(String.valueOf(answer2));
		
	}catch(Exception ex){
	JOptionPane.showMessageDialog(null, "Invalid Numbers");
		
	}
	
}
private void subtractbutton_ActionPerformed(){
	try{
		int num1, num2;
		num1 = Integer.parseInt(firstNumber.getText());
		num2 = Integer.parseInt(secondNumber.getText());
		int answer2 = num1-num2;
		answer.setText(String.valueOf(answer2));
		
	}catch(Exception ex){
	JOptionPane.showMessageDialog(null, "Invalid Numbers");
		
	}
	
}
private void multiplicationbutton_ActionPerformed(){
	try{
		int num1, num2;
		num1 = Integer.parseInt(firstNumber.getText());
		num2 = Integer.parseInt(secondNumber.getText());
		int answer2 = num1*num2;
		answer.setText(String.valueOf(answer2));
		
	}catch(Exception ex){
	JOptionPane.showMessageDialog(null, "Invalid Numbers");
		
	}
	
}
private void divisionbutton_ActionPerformed(){
	try{
		int num1, num2;
		num1 = Integer.parseInt(firstNumber.getText());
		num2 = Integer.parseInt(secondNumber.getText());
		int answer2 = num1/num2;
		answer.setText(String.valueOf(answer2));
		
	}catch(Exception ex){
	JOptionPane.showMessageDialog(null, "Invalid Numbers");
		
	}
	
}
Clear screen button function goes here
}

[Nepomuk]

Just to make sure I understand you correctly: You want to clear some JTextFields, correct? Well, JTextField extends JTextComponent and that has a setText(String) function. So you could do something like this:

answer.setText("");

As you're setting it to an empty string, it will be empty after that. You'll want to do this in the ActionListener of the Clear button of course.

[aravind12345]

Thanks you solved my problem. I would like to make button for the numbers as well but i don't know how can you tell me how?

[Nepomuk]

Where exactly are you stuck with that?