Java Numbers Class
Table of Contents
When we use Java Numbers Class in our java program, we use primitive data types such as byte, int, long, double, etc.
Example
int i = 1000; float f = 13.65; double d = 0xaf;
Wrapper Classes
Integer, Long, Double, Byte, Float, Short are sub-classes of the abstract class Number.
Boxing :- It is converting primitive datatype into object is called boxing.
Unboxing :- It is converting an object of a wrapper type into its corresponding primitive value is called unboxing.
Example of boxing and unboxing
public class Test {
public static void main(String args[]) {
Integer k = 7; // boxes int to an Integer object
k = k + 10; // unboxes the Integer to a int
System.out.println(k);
}
}
//
Output
17Number Methods
| Sr.No. | Method | Description |
|---|---|---|
| 1. | xxxValue() | It is converts the value of this Number object to the xxx data type and returns it. |
| 2. | compareTo() | This method compares this Number object to the argument. |
| 3. | equals() | This method checks whether this Number object is equal to the argument. |
| 4. | valueOf() | This method returns an Integer object holding the value of the specified primitive. |
| 5. | toString() | This method a String object representing the value of a specified int or Integer. |
| 6. | parseInt() | This method is used to get the primitive data type of a certain String that contains numeric value. |
| 7. | abs() | Get the absolute value of the argument. |
| 8. | ceil() | Get the smallest integer that is greater than or equal to the argument. Its returned as a double. |
| 9. | floor() | Get the largest integer that is less than or equal to the argument. Its returned as a double. |
| 10. | rint() | Get the integer that is closest in value to the argument. Its returned as a double. |
| 11. | round() | Get the closest long or int, as indicated by the method’s return type to the argument. |
| 12. | min() | Get the smaller of the two arguments. |
| 13. | max() | Get the larger of the two arguments. |
| 14. | exp() | Get the base of the natural logarithms, e, to the power of the argument. |
| 15. | log() | Get the natural logarithm of the argument. |
| 16. | pow() | Get the value of the first argument raised to the power of the second argument. |
| 17. | sqrt() | Get the square root of the argument. |
| 18. | sin() | Get the sine of the specified double value. |
| 19. | cos() | Get the cosine of the specified double value. |
| 20. | tan() | Get the tangent of the specified double value. |
| 21. | asin() | Get the arcsine of the specified double value. |
| 22. | acos() | Get the arccosine of the specified double value. |
| 23. | atan() | Get the arctangent of the specified double value. |
| 24. | atan2() | Its converts rectangular coordinates (x, y) to polar coordinate (r, theta) and returns theta. |
| 25. | toDegrees() | Its converts the argument to degrees. |
| 26. | toRadians() | Its converts the argument to radians. |
| 27. | random() | Get a random number. |
Question :-
- What is wrapper classes in Java?
- What is Java Numbers Class?
- How to use random() in Java?
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