Java Integer valueOf() method

The valueOf() method of Java Integer class returns an Integer object holding the specified int value. The second method returns an Integer object holding the specified String value. The third syntax returns an Integer object which represents the specified String when parsed with the given radix. Syntax

1. public static Integer valueOf (int i)
2. public static Integer valueOf(String s) throws NumberFormatException
3. public static Integer valueOf(String s, int radix) throws NumberFormatException

 Parameters i- an int value s- the string to be parsed radix- the radix to be used in interpreting s Throws The valueOf() method throws: NumberFormatException- if the string does not contain a parsable int.  Return Value This method returns an int object holding the value represented by ‘i’ or by the string or by the string argument in the specified radix. Example 1

public class JavaIntegerValueOfExample1 {
    public static void main(String[] args) {
        // returns a Integer object which represents the specified int
        int val=12;
        System.out.println("valueOf() method returns : "+Integer.valueOf(val));
    }
}

Output

valueOf() method returns : 12

Example 2

public class JavaIntegrValueOfExample2 {
    public static void main(String[] args) {
        // returns a Integer object which represents the specified String
        String str="369876543234567890";
        //return an exception if the string does not contain a parsable byte
        System.out.println("valueOf() method returns : "+Integer.valueOf(str));
    }
}

Output

Exception in thread "main" java.lang.NumberFormatException: For input string: "369876543234567890"
              at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
              at java.lang.Integer.parseInt(Integer.java:583)
              at java.lang.Integer.valueOf(Integer.java:766)
              at com.TutorialAndExample.JavaIntegerValueOfExample2.main(JavaIntegerValueOfExample2.java:8)

Example 3

public class JavaIntegerValueOfExample3 {
    public static void main(String[] args) {
        // returns a Integer object which represents the specified String when parsed with the given radix
        String str="36";
        int radix=Character.MAX_RADIX;
        //return an exception if the string does not contain a parsable byte
        System.out.println("valueOf() method returns : "+Integer.valueOf(str,radix));
    }
}

Output

valueOf() method returns : 114

Example 4

public class JavaIntegerValueOfExample4 {
    public static void main(String[] args) {
        // returns a Integer object which represents the specified String
        String str="369";
        int radix=98;
        //return an exception if the radix is greater than Character.MAX_RADIX
        System.out.println("valueOf() method returns : "+Integer.valueOf(str,radix));
    }
}

Output

Exception in thread "main" java.lang.NumberFormatException: radix 98 greater than Character.MAX_RADIX
              at java.lang.Integer.parseInt(Integer.java:551)
              at java.lang.Integer.valueOf(Integer.java:740)
              at com.TutorialAndExample.JavaIntegerValueOfExample4.main(JavaIntegerValueOfExample4.java:9)