public class Outer1
{
	public static void main(String[] args) 
	{
		Outer2 objOuter1 = new Outer2();
		Outer2.Inner1 objInner1 = objOuter1.new Inner1();  
		objInner1.innerMethod1();
	}
}

class Outer2 
{	
	public void makeInner()
	{
		Inner1 objInner1 = new Inner1();
		objInner1.innerMethod1();
	}
	
	class Inner1
	{
		public void innerMethod1()
		{
			System.out.println("This is Inner Method1");
		}
	}
}

Output

This is Inner Method1