Java String.copyValueOf() Method

Last Updated : 24 Apr, 2025

The copyValueOf() method in Java is used to create a new String by copying characters from a character array. It is a static method of the String class.

Variants: There are two variants of this method.

Copy Entire Character Array
Copy Subarray

1. Copy Entire Character Array

This method copies the entire contents of a character array into a new string.

Syntax:

public static String copyValueOf(char[] ch)

Parameter: ch: The character array to copy.
Return Value: It returns a string containing the contents of the character array.

Example:

Java

// Java code to demonstrate the working of 
// copyValueOf implementation 1 
public class Geeks {
    
  public static void main(String args[]) {
      
    // Initialising Character array
    char[] ch = {'S', 'w', 'e', 't', 'a', ' ', 'D', 'a', 's', 'h'};
     
    // Copying value into a String
    String ch2 = String.copyValueOf(ch);
     
    System.out.println("The new copied string is: " + ch2);
  }
}

Output

The new copied string is: Sweta Dash

2. Copy Subarray

This method copies a specific portion that is a subarray of a character array into a new string.

Syntax:

public static String copyValueOf(char[] ch, int index, int count)

Parameter:
- ch: The character array to copy.
- index: Starting index to copy
- count: Number of characters to copy
Return Value: It returns a string consisting of the specified subarray of the character array.

Example:

Java

// Java code to demonstrate the working of 
// copyValueOf implementation 2
public class Geeks {
    
  public static void main(String args[]) {
      
    // Initialising Character array
    char[] ch = {'S', 'w', 'e', 't', 'a', ' ', 'D', 'a', 's', 'h'};
     
    // Copying only first 5 characters
    String ch2 = String.copyValueOf(ch, 0, 5);
     
    System.out.println("The new copied string is: " + ch2);
  }
}

Output

The new copied string is: Sweta

Application Example: Extracting Substrings

This function can be used to general copy or extract only prefix or suffix from the string using implementation 2. One possible example can be extracting only the amount from the given “Rs 1024” type of strings which deal with denominations.

Illustration:

Java

// Java code to demonstrate application of copyValueOf 
public class Geeks {
    
  public static void main(String args[]) {
      
    // Initialising Character array
    char[] ch = {'R', 's', ' ', '1', '0', '2', '4'};
     
    // Display original array
    System.out.print("The original array is: ");
    for (char c : ch) 
      System.out.print(c);
     
    System.out.print("\n");
     
    // Extract only "1024"
    String ch2 = String.copyValueOf(ch, 3, 4);
     
    System.out.println("The new string is: " + ch2);
  }
}

Output

The original array is: Rs 1024
The new string is: 1024

Java Vector copyInto() Method

Astha Tyagi

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Practice Tags :

Java String.copyValueOf() Method

1. Copy Entire Character Array

2. Copy Subarray

Application Example: Extracting Substrings

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