Here is a simple Java Applet program that accepts two floating point numbers, calculates their sum and displays the result:

```java
import java.applet.*;
import java.awt.*;
import java.awt.event.*;

public class SumApplet extends Applet implements ActionListener {
TextField text1, text2;

public void init() {
text1 = new TextField(10);
text2 = new TextField(10);

add(text1);
add(text2);

text1.addActionListener(this);
text2.addActionListener(this);
}

public void actionPerformed(ActionEvent ae) {
repaint();
}

public void paint(Graphics g) {
String s1, s2, sum;
float a=0, b=0, result=0;

g.drawString("Input a float number in each box ", 0, 50);

try {
s1 = text1.getText();
a = Float.parseFloat(s1);
s2 = text2.getText();
b = Float.parseFloat(s2);
result = a + b;
} catch(NumberFormatException e) {
g.drawString("Invalid Format", 0, 80);
return;
}

g.drawString("The sum is: " + String.valueOf(result), 0, 100);
}
}
```

This program creates two text fields for input. When you enter a number in each field and press Enter, the `actionPerformed` method is called, which triggers a repaint. The `paint` method is then called, which retrieves the text from the text fields, converts them to floats, adds them, and displays the result. If the text cannot be converted to a float, it catches the `NumberFormatException` and displays an error message.

Question

Here is a simple Java Applet program that accepts two floating point numbers, calculates their sum and displays the result:

```java
import java.applet.*;
import java.awt.*;
import java.awt.event.*;

public class SumApplet extends Applet implements ActionListener {
    TextField text1, text2;

public void init() {
        text1 = new TextField(10);
        text2 = new TextField(10);

add(text1);
        add(text2);

text1.addActionListener(this);
        text2.addActionListener(this);
    }

public void actionPerformed(ActionEvent ae) {
        repaint();
    }

public void paint(Graphics g) {
        String s1, s2, sum;
        float a=0, b=0, result=0;

g.drawString("Input a float number in each box ", 0, 50);

try {
            s1 = text1.getText();
            a = Float.parseFloat(s1);
            s2 = text2.getText();
            b = Float.parseFloat(s2);
            result = a + b;
        } catch(NumberFormatException e) {
            g.drawString("Invalid Format", 0, 80);
            return;
        }

g.drawString("The sum is: " + String.valueOf(result), 0, 100);
    }
}
```

This program creates two text fields for input. When you enter a number in each field and press Enter, the `actionPerformed` method is called, which triggers a repaint. The `paint` method is then called, which retrieves the text from the text fields, converts them to floats, adds them, and displays the result. If the text cannot be converted to a float, it catches the `NumberFormatException` and displays an error message.

Knowee AI · Accepted Answer