Top 10 Java Programming Best Practices
Good code adheres to certain principles, and understanding these can significantly enhance your chances of success. Here, we’ll share essential Java programming best practices that will guide you on your journey. We’ll explore key tips and tricks, ranging from general software development advice to specific Java coding standards and project-related insights. Let’s dive in!
1. Follow Coding Standards and Best Practices
Following coding standards is essential for the consistency and readability of code in both software code as well as normal programming code as it helps to debug and remove errors in the code. Oracle provides a set of code conventions for writing Java code, which covers topics such as naming conventions, indentation, and commenting. Adhering to these conventions can improve code readability, maintainability, and reduce the likelihood of errors in the code and help in debugging the code.
Example:
// Java Program to implement
// above approach
// Driver class
public class GFG {
private int variableOne;
private String variableTwo;
public GFG(int variableOne, String variableTwo)
{
this.variableOne = variableOne;
this.variableTwo = variableTwo;
}
public void setVariableOne(int variableOne)
{
this.variableOne = variableOne;
}
public int getVariableOne() { return variableOne; }
public void setVariableTwo(String variableTwo)
{
this.variableTwo = variableTwo;
}
public String getVariableTwo() { return variableTwo; }
}
2. Using Efficient Data Structures
In Java programming, choosing the right data structure is critical for the optimal performance of the code. For example, when working with large datasets, it is better to use an array or ArrayList instead of a LinkedList. Similarly, using a PriorityQueue can help improve the efficiency of certain algorithms. Such data structures can help you optimize your code and bring down the time and space complexity of the code.
Example:
// Java Program to demonstrate
// Using efficient Data Structures
import java.util.Arrays;
// Driver Class
public class GFG {
// main function
public static void main(String[] args)
{
int[] arr = { 5, 8, 1, 3, 7 };
// Use an efficient sorting algorithm
Arrays.sort(arr);
for (int i = 0; i < arr.length; i++) {
System.out.print(arr[i] + " ");
}
}
}
Output
1 3 5 7 8
3. Using Efficient Algorithms During Coding Contests
In programming, the efficiency of the used algorithms can make a significant difference in the performance of the code. It is essential to use efficient algorithms for solving problems during coding or participating in contests. When searching for an element in an array, it is better to use binary search instead of linear search. An efficient algorithm needs to be used in order to reduce the time complexity of the code and further optimize the code.
Example:
// Java Program to demonstate
// Using efficient algorithms during coding contests
// Driver Class
public class GFG {
// main function
public static void main(String[] args)
{
int[] arr = { 1, 3, 5, 7, 9 };
int target = 5;
int low = 0;
int high = arr.length - 1;
int mid;
// Use of efficient algorithms such
// as binary search
while (low <= high) {
mid = (low + high) / 2;
if (arr[mid] == target) {
System.out.println("Target found at index "
+ mid);
return;
}
else if (arr[mid] > target) {
high = mid - 1;
}
else {
low = mid + 1;
}
}
System.out.println("Target not found");
}
}
Output
Target found at index 2
4. Minimizing Input and Output Operations
In competitive as well as normal programming, (I/O) operations can be time-consuming which may cause your rank to go down during the contest. Therefore, it is essential to minimize the number of I/O operations as much as possible. You can read all the input data at once and store it in memory, and then perform all the computations before giving the output of the results.
the Example:
// Java Program to implement
// Minimizing input/output operations
import java.util.*;
import java.util.Scanner;
// Driver Class
public class GFG {
// main function
public static void main(String[] args)
{
Scanner sc = new Scanner(System.in);
int n = sc.nextInt();
int[] arr = new int[n];
for (int i = 0; i < n; i++) {
arr[i] = sc.nextInt();
}
int sum = 0;
for (int i = 0; i < n; i++) {
sum += arr[i];
}
System.out.println(sum);
}
}
Output
5
1 2 3 4 5
15
5. Avoiding Excessive Object Creation in Java
Creating objects in Java can be expensive in terms of time and memory while participating in contests. Therefore, it is best to avoid excessive object creation whenever possible during contests. One way to do this is to use primitive types instead of wrapper classes.
Example:
// Java Program to demonstrate approach of
// avoiding excessive object creation in Java
// Driver Class
public class GFG {
// main function
public static void main(String[] args)
{
int x = 5;
// Use primitive types instead of wrapper classes
Integer y = Integer.valueOf(x);
System.out.println(y);
}
}
Output
5
6. Use of Java Standard Library Collections
The Java Standard Library Collections which is comparable with C++ STL provides a wide range of classes and methods functions that can be used for solving various problems efficiently and optimally. Therefore, it is essential to be familiar with the Collections and use its classes and methods wherever possible.
Example:
// Java Program to Use of
// Java Standard Library Collections
import java.util.ArrayList;
// Driver class
class GFG {
// main function
public static void main(String[] args)
{
ArrayList<Integer> arrList
= new ArrayList<Integer>();
arrList.add(10);
arrList.add(20);
arrList.add(30);
System.out.println(arrList);
}
}
Output
[10, 20, 30]
7. StringBuilder for String Manipulation
Strings are immutable in Java, which means that each time a string is modified, a new string object is created in memory. This can be inefficient, especially when dealing with large strings. Therefore, it is best to use the StringBuilder class for string manipulation, as it allows for efficient string concatenation and modification and helps you in the contests.
Example:
// Java Program to demonstrate
// StringBuilder for string manipulation
// Driver Class
public class GFG {
// main function
public static void main(String[] args)
{
// Use StringBuilder instead of
// String for string manipulation
StringBuilder sb = new StringBuilder("Hello");
sb.append(" World");
System.out.println(sb.toString());
}
}
Output
Hello World
8. Use of Bitwise Operators
Bitwise operators can be used to solve problems more efficiently. Bitwise AND, OR, XOR, and shift operations can be used for various bitwise manipulations.
Example:
// Java Program to demonstrate
// bitwise operators
// Driver Class
class GFG {
// Main function
public static void main(String[] args)
{
int a = 5; // 101
int b = 3; // 011
int c = a & b; // 001
System.out.println(c);
}
}
Output
1
9. Multithreading
In certain scenarios, multithreading can be used to improve the performance of the code during programming. If the problem during the contest involves processing large data, you can divide the data into smaller chunks and process them in parallel using multiple threads.
Example:
// Java Program to implement
// Multithreading
class GFG extends Thread {
int start, end;
int[] arr;
int result;
public GFG(int start, int end, int[] arr)
{
this.start = start;
this.end = end;
this.arr = arr;
this.result = 0;
}
public void run()
{
for (int i = start; i <= end; i++) {
result += arr[i];
}
}
public static void main(String[] args)
{
int n = 10000000;
int[] arr = new int[n];
for (int i = 0; i < n; i++) {
arr[i] = i;
}
int numThreads = 4;
int chunkSize = n / numThreads;
GFG[] threads = new GFG[numThreads];
for (int i = 0; i < numThreads; i++) {
int start = i * chunkSize;
int end = (i + 1) * chunkSize - 1;
threads[i] = new GFG(start, end, arr);
threads[i].start();
}
int result = 0;
for (int i = 0; i < numThreads; i++) {
try {
threads[i].join();
result += threads[i].result;
}
catch (InterruptedException e) {
e.printStackTrace();
}
}
System.out.println(result);
}
}
Output
-2014260032
10. Optimizing the Code
It is important to optimize your code for performance during the contest. This can involve various techniques such as loop unrolling, reducing branching, and minimizing variable assignments. It is also essential to test your code thoroughly to identify and fix any performance issues and remove errors so it is necessary that your code can be debugged properly for errors and issues.
Here are two examples of code, one before optimization and the other after optimization:
Non-Optimized Code:
// Before optimization
public static int sumOfArray(int[] arr)
{
int sum = 0;
for (int i = 0; i < arr.length; i++) {
sum += arr[i];
}
return sum;
}
Optimized Code:
// After Optimization
public static int sumOfArray(int[] arr)
{
int sum = 0;
int i = 0;
int len = arr.length;
for (; i < len - (len % 4); i += 4) {
sum += arr[i] + arr[i + 1] + arr[i + 2]
+ arr[i + 3];
}
for (; i < len; i++) {
sum += arr[i];
}
return sum;
}
In the optimized code, we are using a generator expression inside the sum() function which creates a generator object that generates the squares of the numbers from 0 to n-1. The “sum()” function then adds up all the squares and returns the total. This is a more concise and efficient way of achieving the same result as the original code.
Top 10 Java Programming Best Practices
Programming is a mind sport where participating programmers strive to find the best solution to problems as quickly as possible. This practice is instrumental in honing problem-solving skills, which are crucial in software development. While C++ is a popular choice for programming, Java is majorly widely used in the software development industry.
For any developer, coding is a fundamental task, and mistakes are inevitable. Sometimes, the compiler will catch these mistakes and provide warnings. However, if the compiler fails to detect them, running the program efficiently becomes challenging. Therefore, it is crucial for any Java app development company to ensure its team follows best practices while developing Java projects. In this blog, we will explore various Java best practices that enable developers to create applications in a standardized manner, ensuring high-quality code and improved project efficiency.
This article is for programmers who want to improve their Java skills. We will discuss the 10 best programming practices for both Java programming and Java development. But before we start, let’s understand what Java programming is.
Table of Content
- What is Java Programming?
- Top 10 Java Programming Best Practices
- 1. Follow Coding Standards and Best Practices
- 2. Using Efficient Data Structures
- 3. Using Efficient Algorithms During Coding Contests
- 4. Minimizing Input and Output Operations
- 5. Avoiding Excessive Object Creation in Java
- 6. Use of Java Standard Library Collections
- 7. StringBuilder for String Manipulation
- 8. Use of Bitwise Operators
- 9. Multithreading
- 10. Optimizing the Code
- Advantages of Implementing These Java Best Practices
- Conclusion
But before we start let’s understand What is Java Programming?