class inside class java code example

Example 1: can we create a class inside a class in java

Yes you can

class OuterClass {
   class InnerClass {
   }
}

Example 2: inner and outer class in java

1. Can Outer class be static? --> No
2. Can inner class be static? --> Yes
3. Can you create an object from the inner class? --> Only if it's static
4. Can we have main method in inner class ? --> Only if it's static
5. Inner class can only be extended if it's static.