Java to Python

Free Java to Python Code Converter

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Transform your code from Java to Python with our free AI-based code convertion tool. If you like what you see, we also create documentation for your code! We don't ever store your code or any representation of it in our databases, but it will be shared with the LLM of our choice for processing.

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How to convert from Java to Python

If you are proficient in Java and are considering converting your code to Python, you are making a great choice given the growing popularity of Python in various fields like web development, data science, and automation. This guide will provide detailed steps and tips on how to achieve an efficient and accurate conversion from Java to Python.

Understanding the Core Differences Between Java and Python

Before diving into the conversion process, it's crucial to understand the core differences between Java and Python. These differences shape how we convert Java code to Python code.

  1. Syntax: Java uses a statically typed syntax and requires explicit declaration of variables, while Python uses a dynamically typed syntax, making it less verbose.
  2. Standard Libraries: The standard libraries in Python are more extensive in certain areas, such as numerical calculations and data manipulation.
  3. OOP (Object-Oriented Programming): Both languages support OOP, but the syntax and certain nuances, such as method definitions and inheritance, differ.

Understanding these core differences will help you adapt your code more accurately.

Converting Data Types

Java and Python handle data types differently. Here are some common examples:

  • Integers and Floats: Java uses primitives (int, float) and their wrapper classes (Integer, Float). Python simply uses int and float.

    int a = 5;
    float b = 10.5f;
    
    a = 5
    b = 10.5
    
  • Strings: In Java, strings are objects created by the String class. In Python, strings are primitives.

    String str = "Hello, World!";
    
    str = "Hello, World!"
    

Translating Control Structures

Control structures like loops and conditionals follow different syntax rules in Java and Python.

  • If-Else Statements:

    if (a > b) {
        System.out.println("a is greater than b");
    } else {
        System.out.println("a is not greater than b");
    }
    
    if a > b:
        print("a is greater than b")
    else:
        print("a is not greater than b")
    
  • For Loops:

    for (int i = 0; i < 10; i++) {
        System.out.println(i);
    }
    
    for i in range(10):
        print(i)
    

Converting Functions and Methods

In Java, functions are part of classes (methods). In Python, functions can exist independently but can also be defined within classes.

  • Defining a Simple Function:

    public int add(int a, int b) {
        return a + b;
    }
    
    def add(a, b):
        return a + b
    
  • Static Methods:

    public static void printMessage() {
        System.out.println("Static method in Java");
    }
    
    @staticmethod
    def print_message():
        print("Static method in Python")
    

Converting Classes and Objects

Though both languages are object-oriented, their syntax for defining and using classes and objects differs.

  • Defining a Class:
    public class Dog {
        private String name;
    
        public Dog(String name) {
            this.name = name;
        }
    
        public String getName() {
            return name;
        }
    }
    
    class Dog:
        def __init__(self, name):
            self.name = name
    
        def get_name(self):
            return self.name
    

Converting Libraries and Frameworks

Java and Python have different libraries and frameworks tailored to their environments. While converting code, equivalent Python libraries should be used:

  • File I/O:
    import java.io.BufferedReader;
    import java.io.FileReader;
    import java.io.IOException;
    
    public class FileRead {
        public static void main(String[] args) throws IOException {
            BufferedReader reader = new BufferedReader(new FileReader("file.txt"));
            String line;
            while ((line = reader.readLine()) != null) {
                System.out.println(line);
            }
            reader.close();
        }
    }
    
    with open("file.txt", "r") as file:
        for line in file:
            print(line, end="")
    

Handling Libraries, Modules, and Packages

The way Java handles packages and modules is also different. In Python:

  • Use import to include modules:

    import math
    print(math.sqrt(16))
    
  • You can also structure your Python project using packages and modules for better organization.

Conclusion

Transitioning from Java to Python involves understanding fundamental differences in syntax, data types, control structures, functions, and classes. While the core logic remains the same, paying attention to these differences ensures that code translation remains efficient and error-free. As you get more comfortable with Python, you'll find that its simplicity and powerful libraries can significantly enhance productivity.

Experimenting with a Free Java to Python Code Converter can also help expedite the process, providing a preliminary conversion that can then be refined manually.

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