File Constructors Explanation

Question

I was unable to understand the following file constructors.

public File(String parent, String child) and 
public File(File parent, String child)

Answer 1

Let's explain with some examples:

Assuming that you have the following structure:

/dir1
  dir11

The constructor that you usually use new File("/dir1/dir11") is equivalent to

new File("/dir1", "dir11") (constructor taking 2 String as arguments)

and also equivalent to

new File(new File("/dir1"), "dir11") (constructor using a File as first argument).