Java String valueOf()

The valueOf() method returns the string representation of the argument passed.


class Main {
  public static void main(String[] args) {

    double interest = 923.234d;

// convert double to string System.out.println(String.valueOf(interest));
} } // Output: 923.234

Syntax of valueOf()

The syntax of the String valueOf() method for different data types is:

String.valueOf(boolean b)
String.valueOf(char c)
String.valueOf(char[] data)
String.valueOf(double d)
String.valueOf(float f)
String.valueOf(int b)
String.valueOf(long l)
String.valueOf(Object o)

Here, valueOf() is a static method. We call the valueof() method using the class name like this: String.valueOf(b);

valueOf() Parameters

The valueOf() method takes a single parameter.

  • data that is to be converted to a string

valueOf() Return Value

  • returns the string representation of the argument passed

Example: Java String valueOf() for Numbers

class Main {
  public static void main(String[] args) {
    int a = 5;
    long l = -2343834L;
    float f = 23.4f;
    double d = 923.234d;

    // convert numbers to strings
    System.out.println(String.valueOf(a));  // "5"
System.out.println(String.valueOf(l)); // "-2343834" System.out.println(String.valueOf(f)); // "23.4"
System.out.println(String.valueOf(d)); // "923.234" } }

Example 2: Convert char and char array to String

In Java, we can convert char and char array to string using the valueOf() method. For example,

class Main {
  public static void main(String[] args) {
    char c = 'J';
    char ch[] = {'J', 'a', 'v', 'a'};

    // convert char to string
System.out.println(String.valueOf(c)); // "J"
// convert char array to string
System.out.println(String.valueOf(ch)); // "Java"
} }

Convert subarray of the char Array to String

You can also convert a subarray of a character array to string. For this, we use this syntax.

valueOf(char[] data, int offset, int length)


  • data - the character array
  • offset - initial offset of the subarray
  • count - the length of the subarray

Example 3: Subarray of a char Array to String

class Main {
  public static void main(String[] args) {
    char ch[] = {'p', 'r', 'o', 'g', 'r', 'a', 'm'};
    int offset = 2;
    int length = 4;
    String result;

// subarray {'o', 'g', 'r', 'm'} is converted to string result = String.valueOf(ch, offset, length);
System.out.println(result); // "ogrm" } }

Example 4: Convert Object to String

import java.util.ArrayList;

class Main {
  public static void main(String[] args) {

    ArrayList<String> languages = new ArrayList<String>();

    String result;

// Output: "[Java, Python, Kotlin]" result = String.valueOf(languages);
System.out.println(result); } }

Here, an ArrayList object, languages, is converted to a string.

In Java, there is another method named copyValueOf() which is equivalent to the valueOf() method.

Note: You can also use the object.toString() method to convert an object to a string. To learn more, visit: Java Object toString() method.

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