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This repository was archived by the owner on Feb 10, 2024. It is now read-only.

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Ram swaroop
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‎_posts/2015-05-14-variables-and-literals.md

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@@ -420,7 +420,7 @@ the uninitialized variable, we can get different behavior depending on __what ty
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with (primitives or objects)__. The behavior also depends on __the level (scope) at which we are declaring our
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variable__.
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Default values for Instance variables (Primitive and Non-primitive):
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#### Default values for Instance variables (Primitive and Non-primitive):
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Variable Type | Default Value
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--------------|----------------
@@ -430,6 +430,41 @@ Variable Type | Default Value
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`char` | `'\u0000'`
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Object reference | `null` (not referencing any object)
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Therefore, for the below program:
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{% highlight java linenos %}
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public class Book {
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private String title; // instance reference variable
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private int noOfPages; // instance primitive variable
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public String getTitle() {
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return title;
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}
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public int getNoOfPages() {
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return noOfPages;
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}
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public static void main(String [] args) {
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Book b = new Book();
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System.out.println("The title is " + b.getTitle());
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System.out.println("No. of pages are " + b.getNoOfPages());
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}
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}
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{% endhighlight %}
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The output will be:
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`The title is null`
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`No. of pages are 0`
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__NOTE:__ `null` is not the same as an empty `String ("")`. A `null` value means the reference variable is not referring
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to any object on the heap.
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#### Array Instance Variable
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#### Default values for Local (also called Stack or Automatic) variables (Primitive and Non-primitive):
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{% include responsive_ad.html %}
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### Q&A

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