Java Numbers Class

Numbers are primitive data types such as int, float, long, double.

Example:

int a = 2000;
float acg = 11.18;
double mask = 0acf;

Java give wrapper classes. All the wrapper classes (Integer, Long, Byte, Double, Float, Short) are subclasses of the abstract class Number. Following is an example of setting1 and setting2.

Example:

public class Test {

    public static void main(String args[]) {
        Integer x = 25; // setting1 int to an Integer object
        x =  x + 24;   // setting2 the Integer to a int
        System.out.println(x);
    }
}

output

49

When x is assigned an integer value, the compiler setting1 the integer because x is integer object. Later, x is setting2 so that they can be added as an integer.

Number Methods

compareTo() – Compares this Number object to the argument.
equals() – This method Determines whether this number object is equal to the argument.
valueOf() – Returns an Integer object holding the value of the specified primitive.
toString() – Returns a String object representing the value of a specified int or Integer.
xxxValue() – Converts the value of this Number object to the xxx data type and returns it.
abs() – Returns the absolute value of the argument.
ceil() – Returns the smallest integer that is greater than or equal to the argument. Returned as a double.
parseInt() – This method is used to get the primitive data type of a certain String.
floor() – Returns the largest integer that is less than or equal to the argument. Returned as a double.
round() – Returns the closest long or int, as indicated by the method’s return type to the argument.
rint() – Returns the integer that is closest in value to the argument. Returned as a double.
min() – Returns the smaller of the two arguments.
max() – Returns the larger of the two arguments.
log() – Returns the natural logarithm of the argument.
pow() – Returns the value of the first argument raised to the power of the second argument.