In Java, valueOf() method converts data from its internal form into a human-readable form. It is a static method that is overloaded within a string for all of Java’s built-in types so that each type can be converted properly into a string.
It is called when a string representation of some other type of data is needed for example during a concatenation operation. You can call this method with any data type and get a reasonable String representation valueOf() returns java.lang.Integer, which is the object representative of the integer.
Syntax of valueOf()
The syntax of valueOf() function for different kind of inputs are:
static String valueOf(int num) static String valueOf(float num) static String valueOf(boolean sta) static String valueOf(double num) static String valueOf(char[] data, int offset, int count) static String valueOf(long num) static String valueOf(Object ob) static String valueOf(char chars[])
Return Values of valueof()
It returns the string representation of the given value.
- valueOf(iNum): Returns the string representation of int iNum.
- String.valueOf(sta): Returns the string representation of the boolean argument.
- String.valueOf(fNum): Returns the string representation of the float fnum.
- String.valueOf(data, 0, 15): Returns the string representation of a specific subarray of the charArray argument.
- String.valueOf(data, 0, 5): Returns the string of charArray 0 to 5.
- String.valueOf(data, 7, 9): Returns the string of charArray starting index 7 and total count from 7 is 9.
Internal Working of valueof() Method
public static String valueOf(Object obj) {
return (obj == null) ? "null" : obj.toString();
}
Examples of Java valueOf() Method
Example 1:
Input : 30 // concatenating integer value with a String Output: 3091 Input : 4.56589 // concatenating float value with a String Output: 914.56589
Java
// Java program to demonstrate// working of valueOf() methodsclass ValueOfExa { public static void main(String arg[]) { int iNum = 30; double fNum = 4.56789; String s = "91"; // Returns the string representation of int iNum. String sample = String.valueOf(iNum); System.out.println(sample); // concatenating string with iNum System.out.println(sample + s); // Returns the string representation of the float // fnum. sample = String.valueOf(fNum); System.out.println(sample); // concatenating string with fNum System.out.println(s + sample); }} |
30 3091 4.56789 914.56789
Example 2:
Java
// Java program to demonstrate// working of valueOf() methodsclass ValueOfExa { public static void main(String arg[]) { char[] data = { 'G', 'E', 'E', 'K', 'S', ' ', 'F', 'O', 'R', ' ', 'G', 'E', 'E', 'K', 'S' }; String sample; // Returns the string representation // of a specific subarray of the chararray argument sample = String.valueOf(data, 0, 15); System.out.println(sample); // Returns the string of charArray 0 to 5 sample = String.valueOf(data, 0, 5); System.out.println(sample); // Returns the string of charArray starting // index 6 and total count from 6 is 8 sample = String.valueOf(data, 6, 8); System.out.println(sample); }} |
GEEKS FOR GEEKS GEEKS FOR GEEK
Example 3:
Input :Geeks for Geeks
// check if String value contains a
// specific string by method contains("Geeks");
Output:true
Java
// The following example shows the// usage of <strong>valueOf(boolean sta)</strong method.public class StringValueOfBoolean { public static void main(String[] args) { // declare a String String data = "Geeks for Geeks"; // check if String value contains a specific string boolean bool = data.contains("Geeks"); // print the string equivalent of our boolean check System.out.println(String.valueOf(bool)); }} |
true
Difference between parseInt and valueOf in Java
The API for Integer.valueOf(String) does indeed say that the String is interpreted exactly as if it were given to Integer.parseInt(String). However, valueOf(String) returns a new Integer() object whereas parseInt(String) returns a primitive int.
