How to make your basic console-based app

Here's the basic frame for a console-based Java application:

class yourApp {
  public static void main (String args[]) { // Or 'String[] args'
    System.out.println("A line of text outputted to stdout");
  }
}

To get a line from standard input(stdin):

class yourApp {
  public static void main (String args[]) {
    String st="";         // Initialize a String object to an empty string
    int i;                // Chararacters inputted from stdin go here after being tested or appended to st
    while (true) {        // Loop forever or until a 'break' statement
      i=System.in.read(); // Get a char from stdin
      if (i==10) break;   // If it's a newline(ASCII 10) then exit
      st += (char)i;      // Cast i(an int) to a char and append it to our string
    }
  }
}

How to make your basic applet

This is a basic template for an applet:

import java.applet.Applet;
/* The extends keyword causes our class to 'extend' the Applet
   class we imported. In other words, we 'inherit' the Applet
   class' methods and public variables. What is inheritance?
   When a class inherits another class' methods and public vari-
   ables, they become available to the class that extended it */
class yourApplet extends Applet {
  public void init () {             // Do initialization stuff
  }
  public void paint (Graphics g) {  // Do stuff during a paint event
  }
  public void update (Graphics g) { // Do stuff when the screen is updated
  }
}

import java.awt.*;
import java.applet.Applet;
public class yourApplet extends java.applet.Applet {
  TextField inputField; // Our input box
  Button bt1;           // The OK button
  String st="";         // Holds the inputted text
  public void init () {
    // The parameter is how many characters wide it is
    TextField inputField=new TextField(15);
    Button bt1=new Button("&OK"); // Or whatever caption you want
    add(inputField); add(bt1);    // Add the controls
    /* Set the layout to a flow layout(I don't really know if
       this is necessary */
    setLayout(new FlowLayout());
  }
  // The action() method is called for any event
  public void action (Event e, Object what) {
    if (e.target==bt1) {          // Our OK button received an event
      // Call upon the powers of OOP to get the text of our input field
      st=inputField.getText();
    }
  } 
}

Threads

class yourApp extends Thread {
  public static void main (String args[]) {
    // Make a new thread object from our class
    Thread thread1=new Thread(new yourApp());
    // Start the thread
    thread1.start();
  }
  public void run () {
    // Some code here
  }
}