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# 53 Real-World Java Projects Ideas To Boost Your Career

### Introduction

Wondering what is Java exponent and how to do exponents in Java?

There is nothing like an exponent in Java compared to other programming languages. You can add it using several methods, for instance, the Math.pow(), for-loop, and while loop.

All of these methods could be used to find the power of a number, but the pow() method is most commonly used to calculate the Java exponent. Because the Math.pow() method can measure the power of any number, i.e., positive or negative.

Furthermore, the Math.pow() method helps save a lot of time since there’s no need to define any user-defined logic, you need to import one static mathematics class i.e. java. util.Math. The operations supported by this math library include absolute value calculation, trigonometric value calculation, round value, exponent calculation, etc. In most cases, the output of all these mathematical operations is always “double,” but they can be converted to integers or floats when required.

An online Java training course can also teach these core exponential Java concepts.

So, without further ado, let’s see how to do Java exponents. But before moving on to the topic, let’s first take a look at a brief overview of exponential Java.

### Brief Overview of Java Exponents

Java exponents serves an instrumental role in mathematical concepts in programming. A base number and an exponent do the representation of power. The number that is being multiplied by itself is the base number. The number of times the base number is multiplied by itself is known as the exponent. It is a crucial mathematical concept that adds to calculating the powers of numbers in Java.

Now that we’ve understood the exponents in Java carry out an excellent job in programming, but to complete this job, we’ve got a method that follows a similar algorithm, which we used in earlier days.

To carry out this method, we must import one important package, Java.lang.Math. This package performs the exponents in Java as well as finds the max. and min. numbers, and the average of the given numbers. You can clearly understand Java Programming through Java tutorials or take up Java learning online classes.

Let’s explore more about Package for Java Exponent.

### What is a Package for Exponents in Java?

A package is referred to as a container in Java that has a collection of classes, sub-packages, and interfaces. Packages are more like a namespace that keeps the interrelated classes and interfaces in a group. Are you wondering how to do exponents? Stay tuned!

### How to do Exponents in Java?

Now that you have an idea of Java exponents let us know how to do exponents in Java!

• First of all, you should open the NetBeans or Eclipse IDE or any other Java IDE you prefer.
• Now you should open the existing Java file or create the new one as needed.
• In the third step, add the math class by writing the command import java.util.Math at the top of the document.

You must know how to call a method in Java; if not, acquiring the knowledge related to it in one go might result in information overload. Therefore, it's important to learn each topic separately.

Here we’re going to learn the pow() method in Java.

pow () method in Java

• This is the most important step, where you will learn how to calculate the exponent in Java.

Double result = Math.pow(number, exponent);

Now replace the number with a base value and the exponent with the power to be raised. For example –

Double result = Math.pow(4,2) i.e.

This result is 16, or 4^2

There are some special cases to consider when using the Pow () method in Java.

• If the second number is zero, either positive or negative, then the output would be 1.0.
• If the second number is one, the value would be the same as the first.
• If the second parameter is N, the result would also be N.

Let us explore a few related concepts to make the concepts easier for you.

#### exp () method in Java

With this method, you can calculate the base value of natural logarithms i.e. the power of an argument. The basic syntax of this method could be written as – Double exp(doubled)

Here, d could be any primitive data type. Here is one example for your reference on using this method to find the exponent value. ### Java code for Negative Exponents

Now that you have learned how to do exponents in Java let us learn how to find the value for negative exponents in Java. You can refer to the code below to better understand the concept.

import java.io.*; import java.util.Scanner; import java.lang.*; class NegativeExponents { public static void main(String[] args) { Scanner in = new Scanner(System.in); double n,x=125,y=2; n=1.0/(Math.pow(x,y)); System.out.println("Negative Exponent of x is = "+n); } }

You just need to copy and paste the content on your IDE and can calculate the final output. You just have to change the values, and the code itself does the rest. If you have doubts, you can contact our expert in Java online classes.

Let’s understand how to do performance analysis using Math operators in Java.

### Performance analysis with Math operators in Java

Performance analysis is usually based on numbers, so a Java developer must know how to perform different mathematical calculations in Java. Working with addition, subtraction, division, multiplication, etc, is easy in all programming languages. Still, you must put more effort and knowledge together to calculate roots, exponential in Java, and percentages.

Math operators in Java are the symbols that represent which operation to execute in a mathematical expression. In other words, these are different symbols that carry out arithmetic operations on two operands.

An operand could be a constant, a variable or an expression. When a mathematical expression is calculated, the resultant’s data type depends upon the data type of operands in the expression.

So, let us see how to calculate the aggregated performance data or how it works with averages with Math operators in Java for enterprises.

• #### Working with Averages

If you want to work with averages, you’ll notice that this is the most common performance tool for statistical data representation. It can usually provide the first impression of data and is used when a few values are very low, and a few are very high. So, the average may be good, but it sometimes lacks to identify the actual performance problems. When you have to analyse data over a long period of time for fluctuations, then the average does not generally work well in those cases. At the same time, when values are pretty small, the average is statistically imprecise.

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Here’s a simple program for your reference:

Ex: Write a Java program to calculate and print the average (or mean) of the stream of given numbers.

Java Code:

import java.util.*;

class solution {

// Prints average of a stream of numbers

static void streamAvg(float arr[])

{

int n = arr.length;

float avg = 0;

for (int i = 0; i < n; i++)

{

//avg = getAvg(avg, arr[i], i);

avg = (avg * i + arr[i]) / (i + 1);

System.out.printf("Average of %d numbers is %f \n",

i + 1, avg);

}

return;

}

// Calculate the new average

static float getAvg(float prev_avg, float x, int n)

{

return (prev_avg * n + x) / (n + 1);

}

public static void main(String[] args)

{

float arr[] = {10, 20, 30, 40, 50, 60, 70, 80, 90, 100};

streamAvg(arr);

}

}

Sample Output:

Average of 1 numbers is 10.000000

Average of 2 numbers is 15.000000

Average of 3 numbers is 20.000000

Average of 4 numbers is 25.000000

Average of 5 numbers is 30.000000

Average of 6 numbers is 35.000000

Average of 7 numbers is 40.000000

Average of 8 numbers is 45.000000

Average of 9 numbers is 50.000000

Average of 10 numbers is 55.000000

• #### How to Find the Minimum or Maximum Values?

With the minimum or maximum values in Java, you generally find the extremes or how these extremes are spread around. But they are not so meaningful for outliers. The data is rarely used in practice and does not accurately measure how often data was used. In a few cases, the occurrence could be one; for others, it could be hundreds or even thousands.

So, you should calculate the threshold value here and check that performance of an app should not move beyond the threshold values.

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For example:

Use Java Math min() to find the smallest number of three.

public class Main

{

public static void main( String[] args )

{/*from w w w . j av a 2s . c o m*/

java.util.Scanner input = new java.util.Scanner( System.in );

System.out.print( "Enter to first number: " );

int number1 = input.nextInt();

System.out.print( "Enter to seconde number: " );

int number2 = input.nextInt();

System.out.print( "Enter to third number: " );

int number3 = input.nextInt();

System.out.printf( "The menimum number is: %d%n", minimumTree( number1, number2, number3 ) );

}

public static int minimumTree( int number1, int number2, int number3 )

{

return Math.min( number1, Math.min( number2, number3 ) );

}

} ### Work with Averages

If you want to work with averages then you will notice that this is the most common performance tool for the statistical representation of the data. It can provide the first impression of data usually and it is used when a few values are very low and a few of them are very high. So, the average may be good but it sometimes lacks in identifying the actual performance problems. When you have to analyze data over a long period of time for fluctuations then the average does not work generally well in those cases. At the same time, when values are pretty small, the average is statistically imprecise.

### How to Find the Minimum or Maximum Values?

With the minimum or maximum values in Java, you generally find out the extremes or how these extremes are spread around. But they are not so meaningful for outliers. The data is rarely used in practice and it does not give an accurate measure of how many times was data used actually. In a few cases, the occurrence could be one and for others, it could be hundreds or even thousands. So, you should calculate the threshold value here and check that performance of an app should not move beyond the threshold values.

### Working with Exponents in Java

The median value is another popular way of presenting data and defining performance. The best part of why it is preferred is because it is higher closer to the real-world data representation, not calculated artificially like averages. Further, the impact of outliers is almost negligible on the median compared to the averages.

A middle value for sorted data is referred to as a Median, and the data can be sorted in ascending or descending order. A median also divides the data into two halves. Learn more about medians by taking up a professional Java online course.

### Working with median instead of average

The median value is another popular way of presenting data and defining performance. The best part of why it is preferred is because it is higher closer to the real-world data representation not calculated artificially like averages. Further, the impact of outliers is almost negligible on the median when compared to the averages.

### Working with Standard Deviation

Today, the average has limited significance only, but the median, Standard deviation, and Java exponents are considered more significant than other mathematical operations. The SD will give you an idea of the spread of actual values. The greater would be the standard deviation value, the larger would be the difference among measurement data. In most cases, the values are distributed normally; if your data does not follow this format, the application of standard deviation could be useless. It means we have to understand the underlying concepts first before we actually apply the concept.

In order to calculate the SD (Standard Deviation), the calculateSD () function is used. If an array of 10 nos. is sent to the function, it’ll calculate the SD and return it to the main() function. Java print arraylist also handles the intersection order internally.

### Working with Percentiles

Percentiles is one of the most absolute techniques to calculate data representation. It will give you the maximum value for a percentage of the overall measurements. Higher percentile values mean chances of success are greater than 95 percent. The outliers do not impact them and give an accurate presentation of the raw data. Further, they are also easy to calculate and measure when compared to averages or medians. The problem lies in calculating the real values because you need more data for the same. Try using it whenever it is possible to apply percentiles because it is faster and results in accurate analysis.

Here, you can see that there is a need to use different values together. Still, a depth idea of concept or mathematical operators in Java can always give you the best result and help in designing an amazing app applicable for real-time computations.

Did you know that approximately more than 3 billion devices use Java for software development? And there are a lot of job opportunities available for Java Developers. Therefore, if you are also preparing for a Java developer interview, here are the top Java interview questions and answers for beginners and professionals that will help you gain a deeper understanding of Java and be well-prepared for your job interview.

Let’s now look at the following example to understand how to work with Percentiles.

For example,

Input: arr[] = { 12, 60, 80, 71, 30 }

Output: { 0, 50, 100, 75, 25 }

Explanation:

Percentile of Student 1 = 0/4*100 = 0 (out of other 4 students no one has marks less than this student)

Percentile of Student 2 = 2/4*100 = 50 (out of other 4 students, 2 have marks less than this student)

Percentile of Student 3 = 4/4*100 = 100 (out of other 4 students, all 4 have marks less than this student)

Percentile of Student 4 = 3/4*100 = 75 (out of other 4 students, 3 have marks less than this student)

Percentile of Student 5 = 1/4*100 = 25 (out of other 4 students only 1 has marks less than this student)

Approach:

• So primarily, the percentile is a no. where a specific percentage of scores falls below that number.
•
• For instance: Suppose, in an examination, a student’s percentile is 75 then it means that the student has scored more than 75% of students who took the test.

• Now, to calculate percentile we’ve the following formula:
• PERCENTILE = (NUMBER OF STUDENTS WHO SCORED BELOW OR EQUAL TO THE DESIRED STUDENT/ TOTAL NUMBER OF STUDENTS – 1) * 100

Below is the implementation of the above approach:

 // Java program to calculate Percentile of Students class GFG {      // Function to calculate the percentile     static void percentile(int arr[], int n)     {         int i, count, percent;          // Start of the loop that calculates percentile         for (i = 0; i < n; i++)         {              count = 0;             for (int j = 0; j < n; j++)             {                  // Comparing the marks of student i                 // with all other students                 if (arr[i] > arr[j])                 {                     count++;                 }             }             percent = (count * 100) / (n - 1);              System.out.print("\nPercentile of Student "             + (i + 1) + " = " + percent);         }     }      // Driver Code     public static void main(String[] args)     {         int[] StudentMarks = { 12, 60, 80, 71, 30 };         int n = StudentMarks.length;         percentile(StudentMarks, n);     } }

Output:

Percentile of Student 1 = 0

Percentile of Student 2 = 50

Percentile of Student 3 = 100

Percentile of Student 4 = 75

Percentile of Student 5 = 25

### Exponents and logarithm functions in Java

There are plenty of functions that are dedicated to exponential and logarithmic calculations. Here, we will be discussing the most common functions that developers frequently use. A list of functions includes –

• `exp ()`
• `log ()`
• `log10 ()`
• `pow ()`
• `sqrt ()`

Let us discuss each of the functions in detail below –

#### 1). Math.exp ()

This function will return the exponential (e) value raised to the power of a given parameter. Here is one example of the function for your reference.

`double exp1 = Math.exp(1); System.out.println("exp1 = " + exp1); double exp2 = Math.exp(2); System.out.println("exp2 = " + exp2); The output for the given program would be – exp1 = 2.718281828459045 exp2 = 7.38905609893065`

#### 2). Math.log ()

With the help of this function, you can calculate the logarithm value of a given parameter. Simply put, this function will perform the reverse function of math.exp () function. Here is one example of the function for your reference.

double log1 = Math.log(1); System.out.println("log1 = " + log1); double log10 = Math.log(10); System.out.println("log10 = " + log10); The output for the given program would be – log1 = 0.0 log10 = 2.302585092994046

The next function is math.log10 () works almost similar to the log function, with the difference that it uses 10 as the base instead of the Euler number.

#### 3). Math.pow ()

This function will be taking two arguments instead of one. The function will return the first parameter raised to the power of the second parameter. Here is one example for your reference so you may get a better idea of using this function.

`double pow2 = Math.pow(2,2); System.out.println("pow2 = " + pow2); double pow8 = Math.pow(2,8); System.out.println("pow8 = " + pow8);`

The output for the given program would be –

#### 4). Math.sqrt ()

This function will help you in calculating the square root value of the given parameters. Here is one quick example to help you –

`double sqrt4 = Math.sqrt(4); System.out.println("sqrt4 = " + sqrt4); double sqrt9 = Math.sqrt(9); System.out.println("sqrt9 = " + sqrt9);`

The output for the given program would be –

`sqrt4 = 2.0 sqrt9 = 3.0`

### Final Words:

Exponential in Java is a crucial concept of Java that enables coding mathematical functions. A strong Concept for exponents is imperative for a Java programmer. The intricate mathematical concepts can be coded easily with the help of exponents.

Here is hoping you could have a brief insight on how to use the exponents in Java. The discussion doesn’t end here, but you have much to learn. For practical experience, you are recommended to join the Java certification training program and enhance your programming skills right away.

The right certification provides extensive industry knowledge and prepares you well for the interviews. If you want a bright career trajectory in the field, hurry up and be a trainee in the upcoming session at online Java training provided by Janbask Training to pave your way to reach heights and beyond!

• C

Do you provide a Java exponents tutorial?

• N

### Nash Martin

Is the Java programmer training easy?

• L

### Lane Clark

How can I be a pro Java programmer?

• C

### Colin Rodriguez

Thanks for the insight

• J

### Jorge Hall

The blog is really helpful to understand how to use the exponents!

• R

### Ronan Wright

What is the real-time usage of exponents?

• K

### Kyle Lee

Coding the mathematical concept is easier with Java exponents.

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