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