Java String valueOf() Method
The valueOf() method of the String class in Java helps to convert various data types like integers, floats, booleans, and objects into their string representations. It makes it simple to work with string manipulation, logging, and displaying data efficiently.
Example:
To convert a number into text for easy display or use in-text operations, we can use the valueOf() method.
// Java program to demonstrate
// working of valueOf() method
public class ValueOf {
public static void main(String[] args) {
int n = 21; // Declare an integer
String s = String.valueOf(n); // Convert integer to string
System.out.println("String representation: " + s);
}
}
Output
String representation: 21
Explanation: The number 21 is converted to the string "21" for easier use in text-related tasks.
Table of Content
Syntax of valueOf() Method
The syntax of valueOf() method for different kind of inputs are:
public static String valueOf(int i)
public static String valueOf(long l)
public static String valueOf(float f)
public static String valueOf(double d)
public static String valueOf(boolean b)
public static String valueOf(char c)
public static String valueOf(char[] data)
public static String valueOf(char[] data, int offset, int count)
public static String valueOf(Object obj)
Return Type: It returns a String that represents the input data. If the input is null, it returns the text "null".
Other Examples of String valueOf() Method
1. Convert Boolean to String Using valueOf()
Example:
public class ValueOf {
public static void main(String[] args) {
boolean b = true; // Boolean variable
String s = String.valueOf(b); // Convert boolean to string
System.out.println("" + s);
}
}
Output
true
Explanation: In the above example, the boolean true becomes the string "true" for display or text use.
2. Convert Object to String Using valueOf()
Example:
public class ValueOf {
public static void main(String[] args) {
Object o = null; // Null object
String s = String.valueOf(o); // Convert object to string
System.out.println("" + s);
}
}
Output
null
Explanation: In the above example, the method converts the null object into the text "null" without errors.
3. Convert Part of a Char Array to String Using valueOf()
Example:
public class ValueOf {
public static void main(String[] args) {
// Character array
char[] ch = { 'H', 'e', 'l', 'l', 'o', ' ', 'W', 'o', 'r', 'l', 'd' };
String s = String.valueOf(ch, 0, 5); // Convert first 5 characters to string
System.out.println("" + s);
}
}
Output
Hello
Explanation: In the above example, the first five characters ('H', 'e', 'l', 'l', 'o') are converted into the string "Hello".
