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package com.inbravo.lang;
/**
* If a nested class is static, it's called Static Nested class
* If a nested class is NOT static, it's called Inner Class
*
* @author amit.dixit
*
*/
public final class NestedClassTest {
public static final void main(final String... args) {
final OuterClass.StaticNestedClass staticNestedClassInstance = new OuterClass.StaticNestedClass();
staticNestedClassInstance.printOuterClassFields();
// OuterClass.InnerClass innerClassInstance = new OuterClass.InnerClass(); <- Compiling Error
final OuterClass outerClassInstance = new OuterClass();
final OuterClass.InnerClass innerClassInstance = outerClassInstance.new InnerClass();
innerClassInstance.printOuterClassFields();
}
}
/**
*
* Outer class
*
*/
final class OuterClass {
private int a = 0;
int b = 1;
protected int c = 2;
public int d = 3;
private static int e = 4;
private static final void invokeStaticMethod() {
System.out.println("\t Static Method of OuterClass is invoked");
}
private final void invokeInstanceMethod() {
System.out.println("\t Instance Method of OuterClass is invoked");
}
/* If a nested class is static, it's called static nested class */
static final class StaticNestedClass {
public final void printOuterClassFields() {
System.out.println("Static Nested Class");
// System.out.println("\t a is " + a); <- Can't access instance fields
// invokeInstanceMethod(); <- Can't access instance method
System.out.println("\t Cannot access instance fields of OuterClass from StaticNestedClass");
System.out.println("\t Static field e is " + e);
invokeStaticMethod();
}
}
/* If a nested class is NOT static, it's called inner class */
final class InnerClass {
public final void printOuterClassFields() {
System.out.println("Inner Class");
System.out.println("\t Instance Field a is " + a);
System.out.println("\t Instance Field b is " + b);
System.out.println("\t Instance Field c is " + c);
System.out.println("\t Instance Field d is " + d);
System.out.println("\t Static field e is " + e);
invokeStaticMethod();
invokeInstanceMethod();
}
}
}