Java

hello world

public class aplication {

	public static void main(String[] args) {
		System.out.println("Hello world!");
		

	}

}

variables

public class variables {

	public static void main(String[] args) {
		int myInt = 88; //Integer 32 bit
                short myShort; //Short 16 bit
                long myLong; //Long 64 bit
                byte myByte; //Byte 8 bit

                double myDouble; //Double 
                float myFloat = 325.25f //Float
                
		char myChar = 'y'; //Char
                boolean myBoolean = true; //Boolean
	}

}