Writing Clean and efficient code-Java
Tags: java, coding, beginners, productivity
Published: 2023-06-01 21:49:40

In the world of software development, writing clean and efficient code is essential. It not only improves the maintainability of the codebase but also enhances collaboration among developers. In this blog post, we will explore some key principles and techniques for writing better code in Java. We'll discuss the benefits of adopting these practices and provide code examples that compare the traditional approach with a better way of writing code.

Utilize Meaningful Variable and Method Names:
One of the fundamental aspects of writing readable code is to use meaningful variable and method names. 

Normal Way:

```
int x = 5;
int y = 10;
int sum = x + y;
System.out.println("The sum is: " + sum);

```
Better Way:

```
int number1 = 5;
int number2 = 10;
int sum = number1 + number2;
System.out.println("The sum is: " + sum);

```
By using descriptive names, such as number1 and number2, it becomes easier to understand the purpose and context of the variables.

Employ Proper Code Formatting:
Maintaining consistent code formatting enhances code readability and reduces the likelihood of errors. 

Normal Way:

```
public void calculateSum(int a,int b){
int sum=a+b;
System.out.println("The sum is: "+sum);
}

```
Better Way:

```
public void calculateSum(int a, int b) {
    int sum = a + b;
    System.out.println("The sum is: " + sum);
}

```
By following consistent indentation, spacing, and placing opening and closing braces properly, the code becomes more readable and easier to navigate.

Avoid Magic Numbers:
Magic numbers are hard-coded numeric values without any explanatory context. They make the code difficult to understand and maintain.

Normal Way:

```
public double calculateArea(double radius) {
    double area = 3.14159 * radius * radius;
    return area;
}
```
Better Way:

```
private static final double PI = 3.14159;

public double calculateArea(double radius) {
    double area = PI * radius * radius;
    return area;
}
```
By introducing a constant PI, we provide a meaningful name for the value and improve the code's readability.

Use Proper Exception Handling:
Exception handling is crucial for writing robust code. It ensures that your application gracefully handles errors and failures.

Normal Way:

```
try {
    // Code that may throw an exception
} catch (Exception e) {
    // Handle the exception
}

```
Better Way:

```
try {
    // Code that may throw a specific exception
} catch (SpecificException e) {
    // Handle the specific exception
} catch (AnotherException e) {
    // Handle another specific exception
}

```
By catching specific exceptions instead of the general Exception, you provide better visibility into potential issues and improve error handling.

Use StringBuilder for String Manipulation:
In Java, manipulating strings using concatenation (+) can be inefficient, especially within loops. The StringBuilder class provides better performance. 

Normal Way:

```
String result = "";
for (int i = 0; i < 10; i++) {
    result += i + " ";
}
System.out.println(result);
```
Better Way:

```
StringBuilder result = new StringBuilder();
for (int i = 0; i < 10; i++) {
    result.append(i).append(" ");
}
System.out.println(result.toString());

```
Use Enhanced for-loop for Iterating Collections:
When iterating over collections like lists or arrays, using the enhanced for-loop (foreach loop) provides a more concise and readable code. 

Normal Way:

```
List<String> names = Arrays.asList("John", "Mary", "David");
for (int i = 0; i < names.size(); i++) {
    String name = names.get(i);
    System.out.println("Hello, " + name + "!");
}

```
Better Way:

```
List<String> names = Arrays.asList("John", "Mary", "David");
for (String name : names) {
    System.out.println("Hello, " + name + "!");
}

```
The enhanced for-loop eliminates the need for index-based access and simplifies the code.

Use Try-with-Resources for Auto-closing Resources:
When working with resources that need to be explicitly closed, such as streams or database connections, using the try-with-resources statement ensures their automatic closure, improving code reliability.

Normal Way:

```
BufferedReader reader = null;
try {
    reader = new BufferedReader(new FileReader("file.txt"));
    String line;
    while ((line = reader.readLine()) != null) {
        // Process the line
    }
} catch (IOException e) {
    // Handle the exception
} finally {
    if (reader != null) {
        try {
            reader.close();
        } catch (IOException e) {
            // Handle the exception
        }
    }
}

```
Better Way:

```
try (BufferedReader reader = new BufferedReader(new FileReader("file.txt"))) {
    String line;
    while ((line = reader.readLine()) != null) {
        // Process the line
    }
} catch (IOException e) {
    // Handle the exception
}

```
The try-with-resources statement automatically closes the BufferedReader at the end of the block, eliminating the need for manual resource handling.

Use Enum Instead of Constants:
When dealing with a fixed set of values, using enums provides better type-safety and code clarity compared to using plain constants. Consider the following example:
Normal Way:

```
public static final int MONDAY = 1;
public static final int TUESDAY = 2;
public static final int WEDNESDAY = 3;
// ...and so on...

```
Better Way:

```
public enum DayOfWeek {
    MONDAY,
    TUESDAY,
    WEDNESDAY,
    // ...and so on...
}

```
By using enums, you can express the intent clearly and leverage the compiler's type-checking capabilities.

Use Generics for Type Safety:
When working with collections or classes that need to be type-safe, using generics ensures compile-time type checking and eliminates the need for explicit type-casting.

Normal Way:

```
List list = new ArrayList();
list.add("Hello");
String greeting = (String) list.get(0);

```
Better Way:

```
List<String> list = new ArrayList<>();
list.add("Hello");
String greeting = list.get(0);

```
By specifying the generic type <String> in the declaration of List, we avoid the need for explicit type-casting and enhance code safety.

Conclusion:
Writing better code in Java is crucial for improving code quality, maintainability, and collaboration among developers. By following the principles discussed in this blog post, such as using meaningful names, proper formatting, avoiding magic numbers, proper exception handling, leveraging appropriate language features, and more, you can enhance the efficiency and readability of your codebase.