Java inheritance: How to achieve something similar to “multiple inheritance” when it is not allowed in Java?

Question

This is a question mostly about Java inheritance. I am developing a program which has 2 windows, both of which will be developed in separate classes which will extend JPanel

Answer 1

You can do as below

public class Files extends JPanel{
}

public class FileSub1 extends Files{
}

public class FileSub2 extends Files{
}