Object references (I)
2 March 2008In this post, I will be talking about how to refer to an object. I will present a simple example to make things obvious.
We have a class called Student. It had 2 attributes, getter setter methods and a method named showAll() to show the contents of both the attributes.
public class Student { private int id; private String name; public Student(int id, String name) { this.id = id; this.name = name; } public Student() { // TODO Auto-generated constructor stub } public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public void showAll() { System.out.println("id: " + id); System.out.println("name: " + name); } }
So far so good. Now lets do some experiments.
// main method … Student obj1 = new Student(1, "Laiq"); System.out.println("From main: "); obj1.showAll(); testMe(obj1); System.out.println("From main: "); obj1.showAll(); … public static void testMe(Student a) { System.out.println("From testMe: "); a.showAll(); a.setName("Toni"); System.out.println("From testMe: "); a.showAll(); }
Output:
From main: id: 1 name: Laiq From testMe: id: 1 name: Laiq From testMe: id: 1 name: Toni From main: id: 1 name: Toni
Do read the next posts on this very topic for the comments on the output and for further examples.
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