Data Conversion Using valueOf() method in Java - GeeksforGeeks

30 Mar, 2021
The valueOf() method converts data from its internal form into a human-readable form. It is static method that is overloaded within string for all of Java’s build-in types, so that each type can be converted properly into a string. 
It is called when a string representation of some other type data is needed-for example during 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 Few forms of valueOf() : 
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[])
Returns:  
It returns string representation of 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
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. 
shaileshpalkumar5
yogeshchanekar9552
Java-Strings
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Java-Strings
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