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public static void main(String[] args) {
System.out.println("Hello World!"); // Prints the string to the console.
}
}
// OddEven.java
import javax.swing.JOptionPane;
public class OddEven {
private int userInput; // a whole number("int" means integer)
/**
* This is the constructor method. It gets called when an object of the OddEven type
* is being created.
*/
public OddEven() {
/*
* In most Java programs constructors can initialize objects with default values, or create
* other objects that this object might use to perform its functions. In some Java programs, the
* constructor may simply be an empty function if nothing needs to be initialized prior to the
* functioning of the object. In this program's case, an empty constructor would suffice.
* A constructor must exist; however, if the user doesn't put one in then the compiler
* will create an empty one.
*/
}
/**
* This is the main method. It gets called when this class is run through a Java interpreter.
* @param args command line arguments (unused)
*/
public static void main(final String[] args) {
/*
* This line of code creates a new instance of this class called "number" (also known as an
* Object) and initializes it by calling the constructor. The next line of code calls
* the "showDialog()" method, which brings up a prompt to ask you for a number.
*/
OddEven number = new OddEven();
number.showDialog();
}
public void showDialog() {
/*
* "try" makes sure nothing goes wrong. If something does,
* the interpreter skips to "catch" to see what it should do.
*/
try {
/*
* The code below brings up a JOptionPane, which is a dialog box
* The String returned by the "showInputDialog()" method is converted into
* an integer, making the program treat it as a number instead of a word.
* After that, this method calls a second method, calculate() that will
* display either "Even" or "Odd."
*/
userInput = Integer.parseInt(JOptionPane.showInputDialog("Please enter a number."));
calculate();
} catch (final NumberFormatException e) {
/*
* Getting in the catch block means that there was a problem with the format of
* the number. Probably some letters were typed in instead of a number.
*/
System.err.println("ERROR: Invalid input. Please type in a numerical value.");
}
}
/**
* When this gets called, it sends a message to the interpreter.
* The interpreter usually shows it on the command prompt (For Windows users)
* or the terminal (For *nix users).(Assuming it's open)
*/
private void calculate() {
if ((userInput % 2) == 0) {
JOptionPane.showMessageDialog(null, "Even");
} else {
JOptionPane.showMessageDialog(null, "Odd");
}
}
}
// Hello.java
import javax.swing.JApplet;
import java.awt.Graphics;
public class Hello extends JApplet {
public void paintComponent(final Graphics g) {
g.drawString("Hello, world!", 65, 95);
}
}
<html>
<head>
<title>Hello World Applet</title>
</head>
<body>
<applet code="Hello.class" width="200" height="200">
</applet>
</body>
</html>
// Hello.java
import java.io.*;
import javax.servlet.*;
public class Hello extends GenericServlet {
public void service(final ServletRequest request, final ServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
final PrintWriter pw = response.getWriter();
try {
pw.println("Hello, world!");
} finally {
pw.close();
}
}
}
// Hello.java (Java SE 5)
import javax.swing.*;
public class Hello extends JFrame {
public Hello() {
super("hello");
super.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
super.add(new JLabel("Hello, world!"));
super.pack();
super.setVisible(true);
}
public static void main(final String[] args) {
new Hello();
}
}
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