public class Diamond{
    private int length;

    public Diamond(int l){
	length = l;
    }

    public void printOut(){
	for (int i=1; i<=length; i++){
	    printChars (length-i, ' ');
	    printChars (2*i-1, '*');
	    System.out.println();
	}
	for (int i=1; i<=length-1; i++){
	    printChars (i, ' ');
	    printChars (2*(length-i)-1, '*');
	    System.out.println();
	}
    }

    private void printChars(int n, char c){
	for (int j=1; j<=n; j++)
	    System.out.print(c);
    }

    public String toString(){
	String output = "";
        for (int i=1; i<=length; i++){
            output += charString (length-i, ' ');
            output += charString (2*i-1, '*');
            output += "\n";
        }
        for (int i=1; i<=length-1; i++){
            output += charString (i, ' ');
            output += charString (2*(length-i)-1, '*');
            output += "\n";
        }
	return output;
    }

    private String charString(int n, char c){
	String ret = "";
	for (int j=1; j<=n; j++)
	    ret += c;
	return ret;
    }
}