How to call and test Custom java code in talend

[gt0731]

Hi Everyone, 

We would like to try following a custom java code using talend. 

I stuck in following java code using java components. I am new to the component testing for java code

Also, I would like to make sure below code tested well before to put in a routine section 

We tried 

below post as well 

https://www.talendbyexample.com/talend-tjavaflex-component-reference.html

it did not work for me 

Here is Input code  

Split file based on size

   

import java.io.FileInputStream;
import java.io.FileOutputStream;

class FileSplitter {

  public static void main(String args[]) throws Exception {
    FileInputStream fis = new FileInputStream(args[0]);
    int size = 1024;
    byte buffer[] = new byte[size];

    int count = 0;
    while (true) {
      int i = fis.read(buffer, 0, size);
      if (i == -1)
        break;

      String filename = args[1] + count;
      FileOutputStream fos = new FileOutputStream(filename);
      fos.write(buffer, 0, i);
      fos.flush();
      fos.close();

      ++count;
    }
  }
}

   
    
    
  

Any help would be much appreciated 

How to test above code in tJava /tJavaFlex  before putting into  routines. ?