javainnerclass.pdf

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Java Inner Class
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What is an Inner Class?
●
Class declared within another class
●
Accessing the members of the inner class:
– Need to instatiate an object instance of an inner class
first
– Example:
innerObj.innerMember = 5;
//innerObj is an instance of the inner class
//innerMember is a member of the inner class
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Accessing Members of Outer class
within an Inner class
●
Methods of the inner class can directly access
members of the outer class
– Example:
1 class Out {
2 int OutData;
3 class In {
4 void inMeth() {
5 OutData = 10;
6 }
7 }
8 }
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Java Program Structure: Inner
Classes
1 class OuterClass {
2 int data = 5;
3 class InnerClass {
4 int data2 = 10;
5 void method() {
6 System.out.println(data);
7 System.out.println(data2);
8 }
9 }
10
11 //continued...
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Java Program Structure:
9 public static void main(String args[]) {
10 OuterClass oc = new OuterClass();
11 InnerClass ic = oc.new InnerClass();
12 System.out.println(oc.data);
13 System.out.println( ic.data2 );
14 ic.method();
15 }
16 }
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