Number Class in Java

Introduction

 

There is a special class known as the Number class. It is used when we want objects in place of data types.

 

Number Class in Java

 

In Java, we need to deal with objects. So we have the Number class in Java. The Number class contains all the wrapper classes in Java. So when we want objects in place of data types in Java, we use the Number class. The java.lang package contains the Number class in Java.

 

Methods of Number Class

 

The Number class in Java has many methods. Some of them are explained below.

 

compareTo( )

 

The Number class object is compared with the argument by this method. We can compare Byte, Integer and so on. The Number and argument should be of the same data type for comparison.

 

Syntax

 

public int compareTo( NumberSubClass referenceName )

 

It will return the value zero if the argument is equal to the Integer.
It will return the value minus one if the argument is greater than the Integer.
It will return the value one if the argument is smaller than the Integer.

 

Example

package demo;
public class Demo {
 public staticvoid main(String args[]) {
  Integer a = 7;
  System.out.println(a.compareTo(2));
  System.out.println(a.compareTo(7));
  System.out.println(a.compareTo(9));
 }
}

Output

 

equals( )

 

It is checked by this method that the object of the Number class and the argument are equal.

 

Syntax

 

public boolean equals(Object o) 

 

It will return the value true if they are equal.
It will return the value false if they are unequal.

 

Example

package demo;
publicclass Demo {
 public staticvoid main(String args[]) {
  Integer a = 6;
  Integer b = 9;
  Integer c = 6;
  Short x = 7;
  System.out.println(a.equals(b));
  System.out.println(a.equals(c));
  System.out.println(a.equals(x));
 }
}

Output

 

abs( )

 

The Absolute value is returned.

 

Syntax

 

double abs(double d)

float abs(float f)

int abs(int i)

long abs(long lng)

 

Example

package demo;
public class Demo {
 public staticvoid main(String args[]) {
  Integer a = -8;
  double d = -100;
  float f = -90;
  System.out.println(Math.abs(a));
  System.out.println(Math.abs(d));
  System.out.println(Math.abs(f));
 }
}

Output

 

ceil( )

 

It will provide an Integer as output. It will be equal to or greater than the argument.

 

Syntax

 

double ceil(double d)

double ceil(float f)

 

Example

package demo;
public class Demo {
 public staticvoid main(String args[]) {
  double x = -10.777;
  System.out.println(Math.ceil(x));
 }
}

Output

 

 

floor( )

 

It will also give an Integer as the output. It will be equal to or smaller than the argument.

 

Syntax

 

double floor(double d)

double floor(float f)

 

Example

package demo;
public class Demo {
 public staticvoid main(String args[]) {
  double x = -10.777;
  System.out.println(Math.floor(x));
 }
}

Output

 

rint( )

 

It will provide an Integer that is nearby to the argument.

 

Syntax

  

double rint(double d)

 

Example

package demo;
public class Demo {
 public staticvoid main(String args[]) {
  double x = 10.7;
  double y = 10.5;
  double z = 10.1;
  System.out.println(Math.rint(x));
  System.out.println(Math.rint(y));
  System.out.println(Math.rint(z));
 }
}

Output

 

 

random( )

 

It will provide a random number. The range will be between 0.0 and 1.0.

 

Syntax

 

static double random()

 

Example

package demo;
public class Demo {
 public staticvoid main(String args[]) {
  System.out.println(Math.random());
  System.out.println(Math.random());
  System.out.println(Math.random());
 }
}

Output

 

 

Summary

 

This article has explained the Number class in Java.