java - How to split string into array of character strings

MainActivity.java 
 package com.cfsuman.me.javaexamples;  import android.graphics.Color; import android.graphics.drawable.ColorDrawable; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.Window; import android.widget.TextView;   public class MainActivity extends AppCompatActivity {      @Override     protected void onCreate(Bundle savedInstanceState) {         requestWindowFeature(Window.FEATURE_ACTION_BAR);         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);          // Set background color for action kafe         getSupportActionBar().setBackgroundDrawable(new ColorDrawable(Color.RED));          // Get widget reference from XML layout         TextView tv = (TextView) findViewById(R.id.tv);          // Initialize a new string variable         String alphabet = "ABCD";          // Display the string         tv.setText("String : " + alphabet);          // Split the String and generate a String array         String[] splitString = alphabet.split("");          tv.setText(tv.getText() + "\nString array length : " + splitString.length);         tv.setText(tv.getText() + "\nString array (split) : ");         // Iterate over the String array         for(int i=0;i<splitString.length;i++){             tv.setText(tv.getText() +""+ splitString[i] + ", ");         }          // Perfect way to split a string to array of character strings         // String split by using regular expression         String[] letters = alphabet.split("(?!^)");          tv.setText(tv.getText() + "\n\nCorrect way to split string to letters");         tv.setText(tv.getText() + "\nString array length : " + letters.length);         tv.setText(tv.getText() + "\nString array (split - regular expression) : ");         // Iterate over the String array         for(int i=0;i<letters.length;i++){             tv.setText(tv.getText() +""+ letters[i] + ", ");         }   } }
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