How to convert an Array to String in Java?

Below are the various methods to convert an Array to String in Java:

1. Arrays.toString() method: Arrays.toString() method is used to return a string representation of the contents of the specified array. The string representation consists of a list of the array’s elements, enclosed in square brackets (“[]”). Adjacent elements are separated by the characters “, ” (a comma followed by a space). It returns “null” if the array is null.

   // Java program to demonstrate
   // working of Arrays.toString()
   
   import java.io.*;
   import java.util.*;
   
   class GFG {
       public static void main(String[] args)
       {
   
           // Let us create different types of arrays and
           // print their contents using Arrays.toString()
           boolean[] boolArr
               = new boolean[] { true, true, false, true };
           char[] charArr
               = new char[] { 'g', 'e', 'e', 'k', 's' };
           double[] dblArr
               = new double[] { 1, 2, 3, 4 };
           int[] intArr
               = new int[] { 1, 2, 3, 4 };
           Object[] objArr
               = new Object[] { 1, 2, 3, 4 };
   
           System.out.println(
               "Boolean Array: "
               + Arrays.toString(boolArr));
           System.out.println(
               "Character Array: "
               + Arrays.toString(charArr));
           System.out.println(
               "Double Array: "
               + Arrays.toString(dblArr));
           System.out.println(
               "Integer Array: "
               + Arrays.toString(intArr));
           System.out.println(
               "Object Array: "
               + Arrays.toString(objArr));
       }
   }
   Output:

   Boolean Array: [true, true, false, true]
   Character Array: [g, e, e, k, s]
   Double Array: [1.0, 2.0, 3.0, 4.0]
   Integer Array: [1, 2, 3, 4]
   Object Array: [1, 2, 3, 4]
   

2. StringBuilder append(char[]): The java.lang.StringBuilder.append(char[]) is the inbuilt method which appends the string representation of the char array argument to this StringBuilder sequence.

   // Java program to illustrate the
   // StringBuilder.append(char[]) method
   
   import java.lang.*;
   
   public class Geeks {
   
       public static void main(String[] args)
       {
   
           StringBuilder sbf
               = new StringBuilder("We are geeks ");
           System.out.println(sbf);
   
           // Char array
           char[] astr
               = new char[] { 'G', 'E', 'E', 'k', 'S' };
   
           // Appends string representation of char
           // array to this String Builder
           sbf.append(astr);
           System.out.println("Result after"
                              + " appending = "
                              + sbf);
   
           sbf = new StringBuilder("We are -");
           System.out.println(sbf);
   
           // Char array
           astr = new char[] { 'a', 'b', 'c', 'd' };
   
           /* Appends string representation of char
                   array to this StringBuilder */
           sbf.append(astr);
           System.out.println("Result after appending = " + sbf);
       }
   }
   Output:

   We are geeks 
   Result after appending = We are geeks GEEkS
   We are -
   Result after appending = We are -abcd