How to get a java file class name by using System.getProperty?

Question

Suppose i have a file named DevelopmentFeeCalculator in the project folder, now i want to get the class name of this file

class main  {

    public static void main(String [] args) throws Exception
    {           
    String className = System.getProperty(DevelopmentFeeCalculator.class.getName());

    String
     className1 = System.getProperty("user.dir.DevelopmentFeeCalculator.class.getName()");

    String
     className2 = System.getProperty("DevelopmentFeeCalculator.class.getName()");

         }
    }

none of them works.

You don't need `System.getProperty`, use just `DevelopmentFeeCalculator.class.getName()` — , Mar 11 '17 at 22:02
What exactly do you need to do? If you need the class name, using system properties is not needed — , Mar 11 '17 at 22:24
I have got a sheet and My faculty draw a diagram where he shoed that we have to use System.getProperty function. I tried many wways but nothing happened. I dont know whether he will accept my project if i dont use this function — Ahsan Habib Himel, Mar 11 '17 at 22:30
You can use system properties for many things, but you don't need it to find the name of a class. I suggest you start from the beginning: https://docs.oracle.com/javase/tutorial/essential/environment/sysprop.html — , Mar 11 '17 at 23:23

score 0 · Answer 1 · answered Mar 11 '17 at 22:05

0

Well System.getProperty is not for that porpuse

Here you can read this:

https://docs.oracle.com/javase/tutorial/essential/environment/sysprop.html

If you want that you just to use:

 String className = System.getProperty(NumberStatistics.class.getName());
    System.out.println(className);
    String classNameCorrect = NumberStatistics.class.getName();
    System.out.println(classNameCorrect);

null reader.NumberStatistics

hope it helps

answered Mar 11 '17 at 22:05

Yussef

610
6
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My Instructor Wants me to use System.getProperty(DevelopmentFeeCalculator.class.getName()) – Ahsan Habib Himel Mar 11 '17 at 22:22

score 0 · Answer 2 · edited May 23 '17 at 11:53

Ok well as i said I don't know why you want to use that, i think maybe you want to read the path from the file or define something a value you know what i mean?

So if you wanna do it in that way you will need to add in your Property a new key and value like this:

package reader;

public class Main {
    public static void main(String[] args) {
        String key= Main.class.getName();
        String value = key;
        System.setProperty(key, value);
        System.out.println(System.getProperty(key));
    }
}

I got: reader.Main

As you can see Now i'm using what you wanted a key and i got the value ;)

Hope it helps

You can read a little bit about this here

How to add new System Properties in java

How to get a java file class name by using System.getProperty?

2 Answers2