import java.awt.*;
import java.awt.event.*;

public class KeyPress extends Frame{
    
    static String str ="";
    Label label;
    TextField txtField;
    public static void main(String[] args,) {
        
        KeyPress k = new KeyPress();
        if(str.equals("w")){
            Calcnew cn = new Calcnew();
            
            
        }
    
        
    }

    public KeyPress(){
        super("Key Press Event Frame");
        Panel panel = new Panel();
        label = new Label();
        txtField = new TextField(20);
        txtField.addKeyListener(new MyKeyListener());
        add(label, BorderLayout.NORTH);
        panel.add(txtField, BorderLayout.CENTER);
        add(panel, BorderLayout.CENTER);
        addWindowListener(new WindowAdapter(){
            public void windowClosing(WindowEvent we){
                System.exit(0);
            }
        });
        setSize(400,400);
        setVisible(true);
    }

    public class MyKeyListener extends KeyAdapter{
        
        
        public void keyPressed(KeyEvent ke){
            char i = ke.getKeyChar();
            str = Character.toString(i);
            String yo = "yo";
            label.setText(str);
            
            if(str.equals("k")){
                label.setText(yo);
                
                
            }
        
            
            
        }
    }    
    
    
    
}

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


public class Calcnew extends JFrame implements FocusListener {
    
    JTextField value1 = new JTextField("0", 5);
    JLabel plus = new JLabel("+");
    JTextField value2 = new JTextField("0", 5);
    JLabel equals = new JLabel("=");
    JTextField sum = new JTextField("0", 5);
    
    public Calcnew(){
        super("Add Two Numbers");
        setSize(350, 90);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        FlowLayout flow = new FlowLayout(FlowLayout.CENTER);
        setLayout(flow);
        value1.addFocusListener(this);
        value2.addFocusListener(this);
        
        sum.setEditable(false);
        add(value1);
        add(plus);
        add(value2);
        add(equals);
        add(sum);
        
        setVisible(true);
        
    }
    
    public void focusGained(FocusEvent event){
        
        
        try{
            float total = Float.parseFloat(value1.getText())+Float.parseFloat(value2.getText());
            
            sum.setText("" + total);
            
            
            
        
            
            
        }catch(NumberFormatException nfe){
            
            value1.setText("0");
            value2.setText("0");
            sum.setText("0");
            
        }
    }
    
    
    public void focusLost(FocusEvent event){
        focusGained(event);
        
    }
    
    
    //public static void main (String[] args){
    //    Calcnew frame = new Calcnew();
        
        
    //}
    

}