แนะนำภาษาจาวา

class father 
{
	int n_time;
	private int to_show (int run_time) 
	{
		run_time = n_time + 1; 
		return run_time;
	}
}
class child extends father 
{
	child() 
	{
		n_time = 5;
		System.out.println(to_show(n_time)); // 7
	}
	public static void main(String[] a) 
	{
		new child();
	}
	private int to_show (int run_time) 
	{
		run_time = n_time + 2; 
		return run_time;
	}
}

class x
{
	public static void main(String ar[])
	{
		int a = 1; int b; b = a; a = 2;
		int c[]={3}; int d[]=c; c[0]=4;
		System.out.println(a+b+c[0]+d[0]); 
	}   // 11
}

//<applet code=x.class width=100 height=100></applet>
import java.applet.*;
import java.awt.*;
public class x extends Applet 
{
	int i = 0;
	public void init() { i = 1; repaint(); }
	public void start() { i += 10; repaint(); }
	public void stop() { i += 100; repaint(); }
	public void destroy() { }
	public void paint(Graphics g) 
	{
		setBackground(new Color(255,255,200));
		Font fnt = new Font("Angsana NEW",Font.PLAIN,20);
		g.setFont(fnt);
		g.drawString(i + "ดูที่นี่",20,20);
	}
}

Subclass of Exception
java.lang.Object java.lang.Throwable java.lang.Error java.lang.Exception
AssertionError, AWTError, CoderMalfunctionError, FactoryConfigurationError, 
LinkageError, ThreadDeath, TransformerFactoryConfigurationError, VirtualMachineError 
java.lang.RuntimeException
java.lang.IndexOutOfBoundsException
java.lang.ArrayIndexOutOfBoundsException
class testofexception {
	public static void main(String[] args) {
		try  {
			System.out.println(1/0);	
		} catch (Exception e)  {
			System.out.println(e);
		}
		// java.lang.ArithmeticException: / by zero
	}
}