JavaVariables.java

public class JavaVariables {
	public static void  main(String[] args) {
		// if we use the variable ; type name = value ;
		int x =5; // whole numbers -2^32 and 2^32
		// type and value must be match.
		
		double y = 4.5 ; // -2^64 and 2^64 
		//float g = 2.9 ; // -2^32 and 2^32
		String name = "Aliş";
		/*RULES for writing class name
		 * We cannot use the spaces in your class name.
		 * Class name cannot contain special char. !! _ $ letters numbers
		 * it starts with capital letter.
		 * 
		 
		 * Rules for writing variable's name
		 * It cannot be started number . It can be contain number.
		 * first word can be lower case letter,other words can be capital letter. exp; studentName
		 * 
		 */
		int a; // declare
		a= 8; // assing a value
		
		a=1000; // updating 
				
	// we give the variable's name. we should be careful because java is case sensitive prog. language.
		int b = 7 ;
		System.out.println(a);
		System.out.println(x+y);
		
	}
}