/*
    Variables3.java
    CIS 160
    David Klick
    2015-09-02

    Demonstration of using reference variables.
*/

public class Variables3 {
    public static void main(String[] args) {
        // Variables can also refer to objects. They are called reference variables.
        // Objects are not one of the eight built-in data types.
        // String objects are one of the most commonly used objects in Java.
        // We still have to declare and initialize a reference variable before we use it.
        
        // Declare and initialize a few reference variables
        Object obj = new Object();   // Object is the data type, obj is the variable name
        
        // Strings are so commonly used that Java allows you to omit the "new String()"
        //    bit when creating them. The two lines below are equivalent.
        String str1 = new String("Hello, world!");
        String str2 = "Hello, world!";
        
        // You can use System.out to display objects (sort of)
        System.out.println(obj);
        System.out.println(str1);
        System.out.println(str2);
    }
}

/*
    You should see something like this when the program is run:

    java.lang.Object@15db9742
    Hello, world!
    Hello, world!
*/