PrintWriter constructors

Question

I've listed below the 8 constructors of PrintWriter class.
PrintWriter(File file), PrintWriter(File file, String csn), PrintWriter(OutputStream out), PrintWriter(OutputStream out, boolean autoFlush), PrintWriter(String fileName), PrintWriter(String fileName, String csn), PrintWriter(Writer out), PrintWriter(Writer out, boolean autoFlush).

Questions:

1. If there's no PrintWriter contructor that takes PrintStream, then how come we can write a statment like I've written below?

2. If there's no PrintWriter contructor that takes BufferedWriter, then how come we can write a statment like I've written below?

         PrintWriter writer1 = new PrintWriter(System.out);
   
         PrintWriter writer2;
         writer2 = new PrintWriter(new BufferedWriter(new FileWriter(new File(outdir, reportFileName))));
   

Thanks in advance.

Answer 1

This is possible because PrintStream inherits from FilterOutputStream and the latter again from OutputStream.

A BufferedWriter inherits from Writer.

Writer and OutputStream are possible variables in the PrintWriter constructors. The big topic, what we are talking about here, is inheritance. There is a good post for this.