Как импортировать math java

Guide to Importing the Math Class in Java

Java is a programming language with a collection of packages, classes, and objects. The Java Math class is available in java.lang package, which is the default package of Java. The Java Math class has multiple methods that can be used to perform calculations, such as finding the square, square roots, tan(), cos(), and logs. This article will demonstrate the various ways you can use to import math in Java.

The Java Math class performs more complex mathematical computations than the fundamental Java math operators. To import Math in Java, you can use the “java.lang” package to access the methods or variables of the Java Math class using their class name. Another way of importing a Math class is to use the “java.lang.Math.*” import statement at the top of the code. This will allow access to all the members and the variables of the Math class without mentioning the class name.

Importing the Math Class in Java

The syntax used to import any package, as well as the class, is given as follows:

import packagename.classname;

To import the package “java.lang” with the “Math” class, we will have to write the code shown below:

The methods and variables of the Math class are static and hence can be accessed using the two ways highlighted below:

1. How to import Java Math class without using the import statement
2. How to import Java Math class while using the import statement

Let us now discuss each of the methods in detail.

Method 1: How to import Java Math class without using the import statement

In Java, the Math class belongs to the “java.lang” package; hence you can use the “Math” class without importing it. This package allows using the associated classes implicitly. In such a way, the methods of the Math class can be accessed with the class name. Let us look at the example below that demonstrates how to import the Java Math class without using the import statement:

In the example above, we can access the “PI,” which is a static variable of the “Math” class, to get the pi value. The most common example of using Pi is finding the area of a circle. In Java programming language, one can call the PI variable without having to import the “java.lang.Math package,” as shown below:

System.out.println(“The value of PI:” + Math.PI);

We shall execute the following examples to get a more concrete understanding of the syntax shown above: Feel free to try them since they have been tried and tested by our experts.

Example 1:

package JavaProgram; public class example < public static void main (String[] args) < System.out.println("The value of PI:" + Math.PI); >>

The output of the code is:

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How to Import Math in Java?

Java language is the collection of packages, classes, and objects. More specifically, the Java Math class is available in java.lang package, the default package of Java. The Math class in Java is utilized for different purposes. It contains multiple methods to perform calculations, such as finding square roots and logs.

This tutorial will demonstrate how to import math in Java.

How to Import Math in Java?

As we discussed above, the Math class belongs to java.lang package, so it helps to access the Math class implicitly. Now we will look at how we can import the Java Math class.

Syntax
The syntax to import any package or class is given as:

To import the package “java.lang” with the “Math” class, we will write something like this:

However, the methods and variables of the Math class are static, so you can access them by using two ways:

• Import Java Math class without using import statement
• Import Java Math class by using import statement

We will now check each of the mentioned methods one by one!

Method 1: Import Java Math Class Without Using Import Statement

In Java, you can use the “Math” class directly without importing it because the Math class belongs to the “java.lang” package that allows using the associated classes implicitly. In this way, we can access the methods of the Math class with the class name. For example:

Have a look at the given examples for calling the static methods and variables of the Math class without importing them.

Example 1
In this example, we will access the “PI” static variable of the “Math” class to get the value of Pi. The most common example of using Pi is finding the area of a circle in any language. In the Java programming language, you can call the PI variable without importing “java.lang.Math package” as follows:

Example 2
In the below example, we will call the “max()” method of the Math class to find the maximum number between “40” and “87”:

Example 3
Here, we will find out the square root of “100” using the “Math.sqrt()” method:

Method 2: Import Java Math Class Using Import Statement

You can also utilize the “import” statement to import the Math class as follows:

Asterisk (*) means “all”, and it signifies that all of the static variables and methods of the Math class will be imported.

The other way to use the import statement is add the variable or method name at the end like this:

The above-given statement will only import the “PI” static variable from the Math class.

Note: This method is more useful as it only requires a one-time definition at the top of the program. After that, you can utilize any method or variable without importing the Math class again and again.

Example 1
Here, we will first import the “java.lang.Math.*” class. Next, we will calculate the square root of a number “100” using the “sqrt()” method:

Then, calculate the maximum number between “40” and “87” with the help of the “max()” method of Math class:

Note that we are accessing both methods without mentioning the Math class, as it is imported before:

Example 2
Now, we will import the PI variable with the Java Math class:

Then, we will print out its predefined value using the “System.out.println()” method:

Example 3
In this example, we will calculate the power of “10” using the “pow” method of the Math class:

We have gathered all the basic and important information related to importing Math in Java.

Conclusion

To import Math in Java, you can use the “java.lang” package to access the methods or variables of the Java Math class with their class name. Another way to import a Math class is to add the “java.lang.Math.*” import statement at the top of the code. It will allow access to all the members and the variables of the Math class without mentioning the class name. In this tutorial, we discussed different ways to import Math in Java.

About the author

Farah Batool

I completed my master’s degree in computer science. I am an academic researcher and love to learn and write about new technologies. I am passionate about writing and sharing my experience with the world.

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Import Math Class in Java

How to import math class in Java? The Math class in Java is available in java.lang package. Since java.lang package is the default package to every Java program, therefore there is no need to import the Math class explicitly in the program.

• Directly through it’s class name (like Math.pow(), Math.sqrt())
• Using static import statement to import all static members of the class.

An example of directly using the class name to import math class in Java,

To get instant Java assignment help you need to contact experts. Let us see a Java program to demonstrate how to import math class in Java and use them in our program.

Java Program to Find the Area of a Circle.

See all variables and methods of Math class in Java with many examples:- Math class in Java. Also see:- Top 100+ Java Programming Examples With Output, Top 40+ Array Programs in Java

Static Import Math class in Java

We can import the Math class statically and then invoke static members without calling through its class name. Learn more about how static import works, and the difference between normal import vs static import in Java:- Static import in Java.

Statement to import Math class all static members:- import static java.lang.Math.*;

The “ import static java.lang.Math.*; ” statement will import all static variables and methods of the Math class.

Example of static import math class in Java

import static java.lang.Math.*; public class Test < public static void main(String[] args) < System.out.println(PI); // 3.141592653589793 System.out.println(E); // 2.718281828459045 System.out.println(pow(2, 3)); // 8.0 System.out.println(exp(1)); // 2.718281828459045 System.out.println(log10(10)); // 1.0 System.out.println(sqrt(64)); // 8.0 System.out.println(cbrt(64)); // 4.0 System.out.println(abs(-20)); // 20 System.out.println(max(10, -20)); // 10 System.out.println(min(10, -20)); // -20 >>

If we want to import only a particular static member using the static import concept then we have to use the following syntax:- import static package.className.staticMember;

It will import only a particular static member. Example:- import static Math.PI; to import only PI variable, import static Math.sqrt; to import only sqrt() method.

Program:- Java Program to find the area of a circle through a static import math class in Java,

import static java.lang.Math.PI; import static java.lang.Math.pow; public class Test < public static void main(String[] args) < int radius = 10; // circle area = π * r * r double area = PI * pow(radius, 2); // display area System.out.println(area); >>

Note that the Math class contains several methods having multiple overloaded forms. For example abs(), max() and min() methods contains 4 overloaded forms per method.

• public static int max(int a, int b)
• public static long max(long a, long b)
• public static float max(float a, float b)
• public static double max(double a, double b)

If the method contains several overloaded forms and we are using static import to import only that particular method then all of its overloaded forms are also imported. Still have doubts in importing Math Class, Get Expert Java Help from the best coders.

import static java.lang.Math.max; public class Test < public static void main(String[] args) < // int max(int a, int b) System.out.println(max(10, 20)); // 20 // long max(long a, long b) System.out.println(max(40L, 30L)); // 40 // float max(float a, float b) System.out.println(max(10.5F, 19.9F)); // 19.9 // double max(double a, double b) System.out.println(max(25.0, 15.5)); // 25.0 >>

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How to import math class in Java example

Math is an important class in Java that holds a lot of important methods and constants. For example, we can use this class to do logarithm, square root, and trigonometric calculations using its built in methods.

It is a public final class:

It belongs to java.lang package.

All methods and variables of this class are static. So, we can easily import these without using any import statements.

In this post, I will show you two different ways to import Math class in a Java program.

Method 1: Import without using any import statement:

We can use any method or constants defined in the Math class by using the class name. We don’t have to import it because java.lang package is the default package in a Java program.

class Main  public static void main(String[] args)  System.out.println(Math.PI); System.out.println(Math.E); System.out.println(Math.sin(30)); System.out.println(Math.cos(60)); System.out.println(Math.tan(30)); System.out.println(Math.min(10, 3)); System.out.println(Math.max(10, 20)); System.out.println(Math.sqrt(100)); System.out.println(Math.cbrt(1000)); > >

This class uses different constants and methods of the Math class without using import since all of these methods and constants are static.

If you run this program, it will print the below output:

3.141592653589793 2.718281828459045 -0.9880316240928618 -0.9524129804151563 -6.405331196646276 3 20 10.0 10.0

Method 2: Import using static import:

We can also use static import to import the members of the Math class. We can import all methods and constants or we can import only specific members.

If you use static import, we don’t have to use Math class to access.

For example, the below program uses static import to import only PI and E.

import static java.lang.Math.PI; import static java.lang.Math.E; class Main  public static void main(String[] args)  System.out.println(PI); System.out.println(E); > >

import static statements are used for static import. If you run this program, it will print the values of PI and E as defined in java.lang.Math class.

3.141592653589793 2.718281828459045

Note that we don’t have to use the classname if we use static import.

Static import all members:

Instead of importing specific members, we can also use * to import everything defined in a class.

import static java.lang.Math.*; class Main  public static void main(String[] args)  System.out.println(PI); System.out.println(E); > >

We can use anything defined in the Math class if we use * to import all.

How to use static import with overloading methods:

Overloading methods can be used in a similar way. We can use these methods directly and based on the parameters, it will pick the specific method.

import static java.lang.Math.*; class Main  public static void main(String[] args)  System.out.println(min(10, 20)); System.out.println(min(10.0, 20.0)); > >

Here, the first method calls:

public static int min(int a, int b)

and the second method calls:

public static long min(long a, long b)

We don’t have to define specifically, it will automatically decide which method to call based on the parameters.

If you run this program, it will print:

The first is an integer and the second is a long.

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