java - How to concatenate two arrays

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.RelativeLayout; import android.widget.TextView;  import java.util.ArrayList; import java.util.Collections; import java.util.List;   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 kafetaria         getSupportActionBar().setBackgroundDrawable(new ColorDrawable(Color.RED));          // Get widget reference from XML layout         RelativeLayout rl = (RelativeLayout) findViewById(R.id.rl);         TextView tv = (TextView) findViewById(R.id.tv);          // Empty the TextView         tv.setText("");          // Initialize a new Array         String[] redColors = new String[]{"Red", "Crimson", "Pink"};          // Initialize another Array         String[] blueColors = new String[]{"Blue", "AliceBlue"};          // Iterate over redColors array         tv.setText("Red colors : ");         for(int i=0;i<redColors.length;i++){             tv.setText(tv.getText() + redColors[i] + ", ");         }          // Iterate over blueColors array         tv.setText(tv.getText() + "\nBlue colors : ");         for(int i=0;i<blueColors.length;i++){             tv.setText(tv.getText() + blueColors[i] + ", ");         }          // Concatenate two arrays using custom method         String[] colors =concatenateTwoArrays(redColors, blueColors);          // Iterate over redColors array         tv.setText(tv.getText() + "\n\nAll colors : ");         for(int i=0;i<colors.length;i++){             tv.setText(tv.getText() + colors[i] + ", ");         }          // Initialize an Integer array         Integer[] numbers = new Integer[]{1,2,3,4};          // Iterate over numbers array         tv.setText(tv.getText() + "\n\nNumbers : ");         for(int i=0;i<numbers.length;i++){             tv.setText(tv.getText() + "" + numbers[i] + ", ");         }          // Initialize another Integer array         Integer[] numbersTenUp = new Integer[]{11,12,13};          // Iterate over numbersTenUp array         tv.setText(tv.getText() + "\nNumbers ten up : ");         for(int i=0;i<numbersTenUp.length;i++){             tv.setText(tv.getText() + "" + numbersTenUp[i] + ", ");         }          // Initialize another Integer array         Integer[] numbersFiftyUp = new Integer[]{51,55};          // Iterate over numbersFiftyUp array         tv.setText(tv.getText() + "\nNumbers fifty up : ");         for(int i=0;i<numbersFiftyUp.length;i++){             tv.setText(tv.getText() + "" + numbersFiftyUp[i] + ", ");         }          // Initialize an ArrayList         List<Integer> allNumbers = new ArrayList<>();          // Add numbers array elements to list         Collections.addAll(allNumbers,numbers);          // Add numbersTenUp array elements to list         Collections.addAll(allNumbers,numbersTenUp);          // Add numbersFiftyUp array elements to list         Collections.addAll(allNumbers,numbersFiftyUp);          // Concatenate all the three Integer arrays         // This is the way to concatenate multiple arrays         Integer[] result = allNumbers.toArray(new Integer[allNumbers.size()]);          // Iterate over concatenated Integer arrays         tv.setText(tv.getText() + "\n\nAll numbers : ");         for(int i=0;i<result.length;i++){             tv.setText(tv.getText() + "" + result[i] + ", ");         }     }      // Custom method to concatenate two String arrays     protected String[] concatenateTwoArrays(String[] arrayFirst,String[] arraySecond){         // Initialize an empty list         List<String> both = new ArrayList<>();          // Add first array elements to list         Collections.addAll(both,arrayFirst);          // Add another array elements to list         Collections.addAll(both,arraySecond);          // Convert list to array         String[] result = both.toArray(new String[both.size()]);          // Return the result         return result;     } }
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