java - How to convert a string to a byte array

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;  import java.io.UnsupportedEncodingException; import java.nio.charset.Charset; import java.nio.charset.StandardCharsets;   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);          // Convert the String to byte array         byte[] bytesOfAlphabet = alphabet.getBytes();          tv.setText(tv.getText() + "\nByte array (simple) : ");         // Iterate over the byte array         for(int i=0;i<bytesOfAlphabet.length;i++){             tv.setText(tv.getText() +""+ bytesOfAlphabet[i] + ", ");         }          // Get the byte array from string using Charset         byte[] byteArray = alphabet.getBytes(Charset.forName("UTF-8"));          tv.setText(tv.getText() + "\nByte array (Charset UTF-8) : ");         // Iterate over the byte array         for(int i=0;i<byteArray.length;i++){             tv.setText(tv.getText() +""+ byteArray[i] + ", ");         }          // Another way to convert string to byte array with Charset         byte[] byteArrayUTF8 = alphabet.getBytes(StandardCharsets.UTF_8);          tv.setText(tv.getText() + "\nByte array (StandardCharacters.UTF_8) : ");         // Iterate over the byte array         for(int i=0;i<byteArrayUTF8.length;i++){             tv.setText(tv.getText() +""+ byteArrayUTF8[i] + ", ");         }          // Another way to convert a string to byte array         // For this way we need to handle exception         try{             byte[] bytes = alphabet.getBytes("UTF-8");              tv.setText(tv.getText() + "\nByte array (UTF-8): ");             // Iterate over the byte array             for(int i=0;i<bytes.length;i++){                 tv.setText(tv.getText() +""+ bytes[i] + ", ");             }         }catch (UnsupportedEncodingException e){             e.printStackTrace();         }    } } 

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