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NestedClass.java
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103 lines (86 loc) · 2.74 KB
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package classObject;
interface AnonymousIntf {
void anonymousMethodOne();
void anonymousMethodTwo();
}
public class NestedClass {
static int sncv = 1;
int ncv = 2;
// creating reference of interface using anonymous class inside a class (Anonymous inner class).
AnonymousIntf ain = new AnonymousIntf() {
// Overriding and defining abstract methods of the interfaces inside the anonymous class.
@Override
public void anonymousMethodOne() {
System.out.println("inside Anonymous Method One\n overridden from anonymous interface abstract method.");
}
@Override
public void anonymousMethodTwo() {
System.out.println("inside anonymous interface two\n overriding the abstract method");
}
};
private int pin = 3;
// main() method starts.
public static void main(String[] args) {
NestedClass nc = new NestedClass();
// instantiation of the nested inner class using object of outer class.
NestedClass.NestedInnerOne nio = nc.new NestedInnerOne();
System.out.println(nio.idk);
nc.instantiateInnerClassTwo();
StaticNestedClass snc = new StaticNestedClass();
System.out.println(snc.st);
System.out.println(NestedClass.StaticNestedClass.stn);
snc.staticNestedClassMethod();
nio.NestedInnerOneSum();
System.out.println(nio.niopin++);
OuterSecondClass osc = new OuterSecondClass();
osc.DisplayOuterSecondClass();
localInnerMethod();
}
static void localInnerMethod() {
// inner class inside method i.e. local inner class.
class LocalInnerClass {
int lic = 7;
public void showLicVal() {
System.out.println(lic);
}
}
LocalInnerClass licl = new LocalInnerClass();
licl.showLicVal();
}
public void instantiateInnerClassTwo() {
NestedClassTwo nct = new NestedClassTwo();
System.out.println(nct.nm);
ain.anonymousMethodOne();
ain.anonymousMethodTwo();
}
// static inner class
static class StaticNestedClass {
static String stn = "Static Nested Class String";
int st = 5;
void staticNestedClassMethod() {
// System.out.println(ncv); // static class cannot refer to non static member of outer(enclosing) class.
System.out.println(sncv);
}
}
// member inner class.
class NestedInnerOne {
int idk = 4;
private int niopin = 6;
public void NestedInnerOneSum() {
System.out.println(idk + pin);
}
}
// member inner class.
class NestedClassTwo {
String nm = "Subhakanta Roul";
}
}
// outer class i.e. class declared outside the class(normal concrete class)
// to access inner class members from here, first create object of the outer class, then create object of inner class using outer class.
class OuterSecondClass {
NestedClass ncc = new NestedClass();
NestedClass.NestedInnerOne ncnio = ncc.new NestedInnerOne();
void DisplayOuterSecondClass() {
ncnio.NestedInnerOneSum();
}
}