Application in Java
Creating a complete Java application involves writing Java code that accomplishes a specific task or provides a service. Java applications can vary widely in complexity, from simple command-line programs to sophisticated graphical user interfaces (GUIs) and web applications. Below, I’ll outline how to create a simple console-based Java application and a basic Java Swing GUI application as examples.
1. Simple Console-Based Java Application:
Here’s an example of a basic console-based Java application that calculates the sum of two numbers entered by the user:
import java.util.Scanner;
public class Calculator {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter the first number: ");
double num1 = scanner.nextDouble();
System.out.print("Enter the second number: ");
double num2 = scanner.nextDouble();
double sum = num1 + num2;
System.out.println("The sum is: " + sum);
scanner.close();
}
}
In this example:
- We import the
java.util.Scannerclass to read input from the user. - We create a
Scannerobject to read user input from the console. - We prompt the user for two numbers, read them, calculate their sum, and then display the result.
To run this program, save it in a file with the name Calculator.java, compile it using the javac command, and execute it using the java command.
2. Basic Java Swing GUI Application:
Creating a simple graphical user interface (GUI) application in Java using Swing involves more code and complexity. Below is a minimal example of a Java Swing GUI application that displays a “Hello, Swing!” message in a window:
import javax.swing.JFrame;
import javax.swing.JLabel;
public class HelloWorldSwing {
public static void main(String[] args) {
JFrame frame = new JFrame("Hello, Swing!");
JLabel label = new JLabel("Hello, Swing!");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(label);
frame.pack();
frame.setVisible(true);
}
}
In this example:
- We import classes from the
javax.swingpackage to create the GUI components. - We create a
JFrameto represent the application window. - We create a
JLabelto display the “Hello, Swing!” message. - We set the default close operation to exit the application when the window is closed.
- We add the
JLabelto the content pane of theJFrame, and then we pack and display the window.
To run this program, save it in a file with the name HelloWorldSwing.java, compile it using the javac command, and execute it using the java command.
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