What is the difference between Java functions and other programming language functions?

Java functions have the following differences compared to other language functions: they must declare a return type, have access modifiers to control visibility, and support method overloading (same function name, different parameter lists). For example, a Java function that calculates and prints the sum of two numbers is: public class MathUtils { public static int add(int a, int b) { return a b; } }

Differences between Java functions and functions in other programming languages

In programming, a function is a reusable block of code that performs a specific task. Java functions have some key differences from other programming language functions.

Return type declaration

Java functions must declare their return type (void means not returning any value). Other languages, such as Python, allow functions to return any type of value without explicitly declaring a return type.

int add(int a, int b) {
  return a + b;
}

def add(a, b):
  return a + b

Access modifiers

Java functions can have access modifiers (such as public, protected, private) that control the visibility of the function to other classes. Other languages ​​often don't have explicit access modifiers.

public int add(int a, int b) {
  ...
}

Method overloading

Java allows function method overloading, that is, using multiple functions with the same name but different parameter lists. Other languages ​​may not support method overloading, or may support overloading with a different syntax.

public class MyClass {
  public int add(int a, int b) {
    ...
  }

  public double add(double a, double b) {
    ...
  }
}

Practical case

Consider a Java function that calculates the sum of two numbers:

public class MathUtils {

  public static int add(int a, int b) {
    return a + b;
  }
}

We can use this function to calculate in a Java program And print the sum of two numbers:

public class Main {

  public static void main(String[] args) {
    int sum = MathUtils.add(5, 10);
    System.out.println("The sum is: " + sum);
  }
}

Output:

The sum is: 15

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