Definition

-class inside another class is called as nested class.

1- static nested class –

It’s is static class which is defined inside another class.

• static nested class can’t access instance variable directly

  

  2- non static class(Inner classes)

  2.1- member class

• It’s is class which is defined inside another class.

  

• member class can access instance variable directly.

  

  2.2- Local class

• It’s is class which is defined and used inside the method another class.

  

  2.3- Anonymous class

• It’s is nameless class which is defined inside body of constructor call.

  

code samples are here
1-Program to create static nested class ‘SmallStatic’ inside Outer class StaticInner and then create object of static nested class ‘SmallStatic’.

package innerClasses;

public class StaticInner { 
static class SmallStatic{ 
SmallStatic(){
System.out.println("i am from static class");
}
} 
public static void main(String[] args) { 
StaticInner.SmallStatic static1=new StaticInner.SmallStatic(); 
} 
}

Run this Program ▶️

package innerClasses;
public class MemberOut { <br />class SmallMember{ <br />SmallMember(){<br />System.out.println("i am called");<br />}<br />} <br />public static void main(String[] args) { <br />MemberOut.SmallMember member=new MemberOut().new SmallMember(); <br />} <br />}

package innerClasses;

public class MethodLocOut { <br />void shw2(){ <br />class SmMth{ <br />SmMth(){<br />System.out.println("i am called"); <br />}<br />} <br />SmMth mth=new SmMth();<br />} <br />public static void main(String[] args) { <br />MethodLocOut mLI=new MethodLocOut(); <br />mLI.shw2(); <br />}<br />}

package innerClasses;

public class AnonCls {
void show(){
System.out.println("hiui");
}

public static void main(String[] args) {
AnonymousClss clss=new AnonymousClss(){
void show(){
System.out.println("hiii");
}
};
clss.show();
}
}