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Description:

The valueOf method returns the relevant Number Object holding the value of the argument passed. The argument can be a primitive data type, String, etc.

This method is a static method. The method can take two arguments, where one is a String and the other is a radix.

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Syntax:

All the variants of this method are given below:

static Integer valueOf(int i)
static Integer valueOf(String s)
static Integer valueOf(String s, int radix)

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The static valueOf method can be used to convert an array of characters into a string. There are several overloaded versions of the valueOf method that can be used to convert a charac- ter and numeric values to strings with different parameter types, char , double , long , int , and float

Methods	Descriptions
+valueOf(c: char): String	Returns a string consisting of the character c.
+valueOf(data: char[]): String	Returns a string consisting of the characters in the array.
+valueOf(d: double): String	Returns a string representing the double value.
+valueOf(f: float): String	Returns a string representing the float value.
+valueOf(i: int): String	Returns a string representing the int value.
+valueOf(l: long): String	Returns a string representing the long value.
+valueOf(b: boolean): String	Returns a string representing the boolean value.

Parameters:

Here is the detail of parameters:

• i -- An int for which Integer representation would be returned.

• s -- A String for which Integer representation would be returned.

• radix -- This would be used to decide the value of returned Integer based on passed String.

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Return Value:

• valueOf(int i): This returns an Integer object holding the value of the specified primitive.

• valueOf(String s): This returns an Integer object holding the value of the specified string representation.

• valueOf(String s, int radix): This returns an Integer object holding the integer value of the specified string representation, parsed with the value of radix.

public class Test{ 

   public static void main(String args[]){
      
      Integer x =Integer.valueOf(9);
      Double c = Double.valueOf(5);
      Float a = Float.valueOf("80");               

      Integer b = Integer.valueOf("444",16);

      System.out.println(x); 
      System.out.println(c);
      System.out.println(a);
      System.out.println(b);
   }
}

This produces the following result:

9
5.0
80.0
1092

Methods	Descriptions
static Float valueOf(float num )	Returns a Float object containing the value passed in num.
static Float valueOf(String str ) throws NumberFormatException	Returns the Float object that contains the value specified by the string in str.
static Double valueOf(double num	Returns a Double object containing the value passed in num.
static Double valueOf(String str ) throws NumberFormatException	Returns a Double object that contains the value specified by the string in str.
static Byte valueOf(byte num )	Returns a Byte object containing the value passed in num.
static Byte valueOf(String str ) throws NumberFormatException	Returns a Byte object that contains the value specified by the string in str.
static Byte valueOf(String str , int radix ) throws NumberFormatException	Returns a Byte object that contains the value specified by the string in str using the specified radix.
static Short valueOf(short num )	Returns a Short object containing the value passed in num.
static Short valueOf(String str ) throws NumberFormatException	Returns a Short object that contains the value specified by the string in str using radix 10.
static Short valueOf(String str , int radix ) throws NumberFormatException	Returns a Short object that contains the value specified by the string in str using the specified radix.
static Integer valueOf(int num	Returns an Integer object containing the value passed in num.
static Integer valueOf(String str ) throws NumberFormatException	Returns an Integer object that contains the value specified by the string in str.
static Integer valueOf(String str , int radix ) throws NumberFormatException	Returns an Integer object that contains the value specified by the string in str using the specified radix.
static Long valueOf(long num	Returns a Long object containing the value passed in num.
static Long valueOf(String str ) throws NumberFormatException	Returns a Long object that contains the value specified by the string in str.
static Long valueOf(String str , int radix ) throws NumberFormatException	Returns a Long object that contains the value specified by the string in str using the specified radix.
static Boolean valueOf(boolean boolVal	Returns the Boolean equivalent of boolVal
static Boolean valueOf(String boolString	Returns true if boolString contains the string “true” (in uppercase or lowercase). Otherwise, it returns false.
static > T valueOf(Class e-type , String name )	Returns the constant associated with name in the enumeration type specified by e-type.

Example

// Java program to demonstrate valueOf() method
public class ValueOfMethod
{
    public static void main(String[] args)
    {
        // demonstrating valueOf(int i) method
        System.out.println("Demonstrating valueOf(int i) method");
        Integer i =Integer.valueOf(50);
        Double d = Double.valueOf(9.36);
        System.out.println(i);
        System.out.println(d);

        // demonstrating valueOf(String s) method
        System.out.println("Demonstrating valueOf(String s) method");
        Integer n = Integer.valueOf("333");
        Integer m = Integer.valueOf("-255");
        System.out.println(n);
        System.out.println(m);

        // demonstrating valueOf(String s,int radix) method
        System.out.println("Demonstrating (String s,int radix) method");
        Integer y = Integer.valueOf("333",8);
        Integer x = Integer.valueOf("-255",16);
        Long l = Long.valueOf("51688245",16);
        System.out.println(y);
        System.out.println(x);
        System.out.println(l);

        // run-time NumberFormatException will occur in below cases
        Integer a = Integer.valueOf("Hello");
        Integer b = Integer.valueOf("Hello",16);
    }
}

This will produce the following result ?

Output

Demonstrating valueOf(int i) method
50
9.36
Demonstrating valueOf(String s) method
333
-255
Demonstrating (String s,int radix) method
219
-597
1365803589
Exception in thread "main" java.lang.NumberFormatException: For input string: "Hello"
        at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
        at java.lang.Integer.parseInt(Integer.java:580)
        at java.lang.Integer.valueOf(Integer.java:766)
        at ValueOfMethod.main(ValueOfMethod.java:30)
Press any key to continue . . .

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