Java Interface Implementation Problem

Question

I have a little problem.

Class ll:

interface jj{ public class ll implements gg{ public static String j ="C:\\"; //some code here } }

Class ggg:

interface gg{ public class ggg extends JFrame implements jj{ //bunch of code + a textfield textField = new JTextField(); textField.setBounds(72, 120, 217, 20); textField.setColumns(10); //bunch of code } }

CLass aaa

public class aaa implements jj, gg { public aaa(){ //File chooser here + editing strin "j" from class "ll" File f = chooser.getSelectedFile(); if(f!=null) { jj.ll.j = f.getPath(); //And printing "j" string to the text field from ggg class gg.ggg.textField.setText(jj.ll.j); } } }

My problem is, that text field printing doesn't work. I tryed to System.out.println the jj.ll.j string to test if it has something. and yes it has and works how expected.

My advice is to not embed non-interface classes inside an interface. — Powerlord
– Powerlord, Commented Jul 21, 2010 at 17:01
I need to use j string in 3 others classes. it would be much easier if java mades a multi inheritance feature, but we have what we have. — artouiros
– artouiros, Commented Jul 21, 2010 at 17:10
@shevchuk, use inheritance only when there is a object graph with parent-child relationships between classes. You dont need inheritance to access the same object from 3 other classes. — Vineet Reynolds
– Vineet Reynolds, Commented Jul 21, 2010 at 17:29
is this intentionally being obfuscated beyond all meaning? This is one of the strangest ways of declaring "public constants" I've ever seen. — matt b
– matt b, Commented Jul 21, 2010 at 17:40

PhiLho · Accepted Answer · 2010-07-21 17:22:05Z

I don't get the logic of making a class inside an interface.

If you need the j string in various classes, just declare it as a public static field in some class. Implementing an interface to get a constant is quite old fashioned. If you use Java 1.5+, do a static import.

I don't really get how to do a static import. Could you please give an example.

Bill K · Accepted Answer · 2010-07-21 17:12:18Z

I'm a little surprised that the compiler lets you do that--but unless you are just curious, don't do this.

Just find another way.

Added complexity is never worth it.

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