java - How to convert an array to a string

MainActivity.java 
 package com.cfsuman.me.javaexamples;  import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.widget.TextView; import java.util.Arrays;   public class MainActivity extends AppCompatActivity {     @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);          // Get widget reference from XML layout         TextView tv = (TextView) findViewById(R.id.tv);          // Initializing a new String array         String[] colors = new String[]{"Red","Green","Yellow","Black"};          tv.setText("String array : ");         // Iterate through the array         for(int i=0;i<colors.length;i++){             tv.setText(tv.getText() + colors[i]+", ");         }          // Convert the array to a String object         String colorsString = Arrays.toString(colors);         tv.setText(tv.getText() + "\nString (direct convert) : " + colorsString);          // Create a String from array elements by adding them manually         colorsString ="";         for(int i=0;i<colors.length;i++){             colorsString +=colors[i];         }         tv.setText(tv.getText() + "\nString (by loop) : " + colorsString);          // Create a String from array elements by adding them manually         // Use a custom separator         colorsString ="";         for(int i=0;i<colors.length;i++){             colorsString +=colors[i] + " | ";         }         tv.setText(tv.getText() + "\nString (loop and separator): " + colorsString);          // Create a String from array elements using StringBuilder         StringBuilder builder = new StringBuilder();         for(int i=0;i<colors.length;i++){             builder.append(colors[i]);         }         tv.setText(tv.getText() + "\nString (loop and StringBuilder): " + builder.toString());          // Create a String from array elements using StringBuilder         builder.setLength(0); // Empty the StringBuilder         for(int i=0;i<colors.length;i++){             builder.append(colors[i]);             builder.append(" : "); // Add a separator for array each element         }         tv.setText(tv.getText() + "\nString (loop and StringBuilder): " + builder.toString());          // Initialize a new int array         int[] result = new int[]{10,20,30,40,50};          tv.setText(tv.getText() + "\n\nInt array : ");         // Iterate through the int array         for(int i=0;i<result.length;i++){             tv.setText(tv.getText() + "" +result[i]+", ");         }          // Convert int array to a String object         String resultString = Arrays.toString(result);          // Display the converted String object         tv.setText(tv.getText() + "\nString (direct convert): " + resultString);     } }
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