AWT

18. Create a simple AWT application design a calculator that displays buttons, TextField with GridLayout manager.

            import java.awt.*;
            import java.awt.event.*;
            
            class MyFrame extends Frame {
                TextField tf = new TextField();       
                  TextField tf2 = new TextField();      
                  TextField selectedTextField;          
                TextField display = new TextField();  
                  double num1 = 0, num2 = 0, result = 0;
                char operator = ' ';
            
                MyFrame() {
                    setBounds(100, 100, 400, 400);
                    setLayout(null);
                    int x=0,y=0,tfw=200,tfh=20;
                    tf.setBounds((x+=50),(y+=100), tfw, tfh);
                    //System.out.println(x +" "+y);
                    tf2.setBounds((x+=250),(y), tfw, tfh);
                    display.setBounds((x+=250), (y), tfw, tfh);
                    // Set up independent text fields (tf and tf2)
                    tf.setColumns(10);
                    tf.setEditable(true);
                    add(tf);
            
                    tf2.setColumns(10);
                    tf2.setEditable(true);
                    add(tf2);
            
                    // Set up calculator display field
                    display.setColumns(20);
                    display.setEditable(false);
                    add(display);
            
                    // Focus listener for text fields to detect selected text field
                    tf.addFocusListener(new FocusAdapter() {
                        public void focusGained(FocusEvent e) {
                            selectedTextField = tf;
                        }
                    });
            
                    tf2.addFocusListener(new FocusAdapter() {
                        public void focusGained(FocusEvent e) {
                            selectedTextField = tf2;
                        }
                    });
            
                    // Create number buttons (0-9) and add them to the frame
                    int bx=0,by=150,w=50,h=50;
                    for (int i = 0; i <10; i++) {
            
                        Button btn=new Button(" "+i);
                        btn.setBounds((bx+=50), by, w, h);
                        System.out.println(bx);
                        add(btn);
                         if (i%3==0) {
                            by+=50;
                            bx=0;
                         }
                        
                        btn.addMouseListener(new MouseAdapter() {
                            public void mouseClicked(MouseEvent e) {
                                if (selectedTextField != null) {
                                    // Update the selected text field
                                    selectedTextField.setText(selectedTextField.getText() + btn.getLabel().trim());
                                } else {
                                    // Update the calculator display
                                    display.setText(display.getText() + btn.getLabel().trim());
                                }
                            }
                        });
                    }
            
                    // Create operation buttons (+, -, *, /, ., =) and add them to the frame
                 String[] operations = {"+", "-", "*", "/", ".", "="};
                 int i=1;
                 for (String op : operations) {
                    
                      Button btnop = new Button(op);
                      btnop.setBounds((bx+=50), by, w, h);
                     btnop.addActionListener(new ActionListener() {
                         public void actionPerformed(ActionEvent e) {
                            System.out.println(op);
                             handleOperation(op);
                         }
                     });
                     add(btnop);
                     System.out.println(i);
                     
                     if(i%3==0)
                     {
                        by+=50;
                        bx=0;
                     }
                     i++;
                 }
            
                    // Close window on exit
                    addWindowListener(new WindowAdapter() {
                        public void windowClosing(WindowEvent e) {
                            System.exit(1);
                        }
                    });
            
                    setVisible(true);
                }
            
                // Handle operation and equals button clicks for calculator
                private void handleOperation(String op) {
                    // System.out.println(op);
                    // System.out.println(tf.getText());
                    // System.out.println(tf2.getText());
                    switch (op) {
                        case "+": case "-": case "*": case "/":
                            num1 = Double.parseDouble(tf.getText());
                            operator = op.charAt(0);
                            display.setText("");
                            break;
                        case ".":
                            if (!display.getText().contains(".")) {
                                display.setText(display.getText() + ".");
                            }
                            break;
                        case "=":
                            num2 = Double.parseDouble(tf2.getText());
                            calculateResult();
                            display.setText(String.valueOf(result));
                            break;
                    }
                }
                private void calculateResult() {
                    switch (operator) {
                        case '+': result = num1 + num2; break;
                        case '-': result = num1 - num2; break;
                        case '*': result = num1 * num2; break;
                        case '/': result = num2 != 0 ? num1 / num2 : Double.POSITIVE_INFINITY; break;
                    }
                }
            }
            
            class Main {
                public static void main(String[] args) {
                    new MyFrame();
                }
            }
        

OUTPUT