generator

package com.utm.lfpc_1_v6;

import android.os.Bundle;
import android.app.Activity;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.TextView;

import com.utm.lfpc_1_v6.R;

import java.util.StringTokenizer;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class MainActivity extends Activity {

    private String[] S = {
            "S",
            "cI"
    };
    private String[] I = {
        "I",
        "bJ",
        "fI",
        "eK",
        "e"
    };
    private String[] J = {
            "J",
            "nJ",
            "cS"
    };
    private String[] K = {
            "K",
            "nK",
            "m"
    };
private String sir = "";
private String finalSir;
private String upper;
     TextView sir1;
    private static final String TAG = "MOT_MyActivity";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        sir1 = (TextView)findViewById(R.id.editText1);
        Log.v(TAG, "Program Started");

    }
    public void generate_btn(View view) {
        int i=1;
        do {
            Log.v(TAG, "called RowGenerator " + i);
            finalSir = RowGenerator(sir);
            i=i+1;
        } while (finalSir.length()<5);

        sir1.setText(finalSir);
    }

    public String RowGenerator(String sir) {

        upper = "";

        Log.v(TAG, "RowGenerator Started");
        int randI = 1 + (int)(Math.random() * 4);
        int randJ = 1 + (int)(Math.random() * 2);
        int randK = 1 + (int)(Math.random() * 2);
        Log.v(TAG, "inside RowGenerator: randI " + randI + ", randJ " + randJ + ", randK "+ randK);

        String upper = sir.replaceAll("[^A-Z]+", "");
        sir = sir.replaceAll("[^A-Z]+", "");

        Log.v(TAG, "String upper " + upper);

//checking if there is a..z & sir>=5
        if ((sir.length()>=5) && upper.isEmpty()) {
            Log.v(TAG, "sir <5 & !b " + sir);
            return sir;
        } else if (sir.isEmpty()) {
            sir = S[1];
            Log.v(TAG, "First sir value: " + sir);
            RowGenerator(sir);
        } // if there is A..Z
        else if (!upper.equals(null)) {
            if(upper.equals(S[0])) {
                sir = sir + S[1];
            } else if (upper.equals(I[0])) {
                sir = sir + I[randI];
            } else if (upper.equals(J[0])) {
                sir = sir + J[randJ];
            } else if (upper.equals(K[0])) {
                sir = sir + K[randK];
            }
            Log.v(TAG, "new value added to sir: " + sir);
            RowGenerator(sir);

        }
        Log.v(TAG, "returning value ");
        return sir;
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

}