I need feedback on what to fill in for my raggedarray java program. Any suggestions would be helpful.

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Java

Java8

Hello everyone, so I am currently learning Java, and I have been working in a RaggedArray.java class which I have completed most of it. The problem is that I do not what to add to the public String toString Method. The file rag.txt:

3
/**/
17 39 82 108
117 8 25
47 58 63 72 99

is read into the field int [ ] [ ] rag by the program RaggedArray.java. I must provide code to the String toString() method so that it will return a string representing rag, i.e.,

17 39 82 108
117 8 25
47 58 63 72 99

with each int being right-justified in a field of width four, and with no line-feed character after the last line.

The RaggedArray.java is listed here:

public class RaggedArray {
    /**/
    private int [ ][ ] rag;
    /**/
    public static void main ( String [] arg ) {
    System.out.println( new RaggedArray() );
    return;
  }
    /**/
    public RaggedArray() {
    initFromFile("rag.txt");
  }
    /**/
    public String toString () {
    /**/
    String lf;
    /*
     *  lf == line-feed character
     */
    lf = System.lineSeparator();
    /*
     *  I have to write code here to finish my program.
     */
  }
    /**/
    private void initFromFile ( String fileName ) {
    /**/
    FileInput fi;
    int numRows;
    /**/
    fi = new FileInput(fileName);
    numRows = fi.readLineInt();
    rag = new int [numRows][];
    fi.readLine();
    for ( int i = 0; i < numRows; ++i ) rag[i] = fi.readLineInts();
    fi.close();
    /**/
    return;
  }
}

What I have tried:

I have written the RaggedArray to fill in the requirements, but I got stuck in what to write for the string toString method.