Перевести код с java на python

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Simple but effective library to translate Java source code to Python.

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natural/java2python

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readme.md

Simple but effective tool to translate Java source code into Python.

The java2python package can translate any syntactically valid Java source code file. The generated Python code is not guaranteed to run, nor is guaranteed to be syntactically valid Python. However, java2python works well many cases, and in some of those, it creates perfectly usable and workable Python code.

For more information, read the introduction. To install, refer to the installation page.

There are lots of docs, plenty of tests, and many options for controlling code generation.

If you’re looking for old releases, check the downloads link above.

Here’s a very simple example:

// This is the HelloWorld class with a single method. class HelloWorld < public static void main(String[] args) < System.out.println("Hello, world."); > >

#!/usr/bin/env python """ generated source for module HelloWorld """ # This is the HelloWorld class with a single method. class HelloWorld(object): """ generated source for class HelloWorld """ @classmethod def main(cls, args): """ generated source for method main """ print "Hello, world." if __name__ == '__main__': import sys HelloWorld.main(sys.argv)

About

Simple but effective library to translate Java source code to Python.

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Перевести код с java на python

This free online converter lets you convert code from Python to Java in a click of a button. To use this converter, take the following steps —

1. Type or paste your Python code in the input box.
2. Click the convert button.
3. The resulting Java code from the conversion will be displayed in the output box.

Key differences between Python and Java

Characteristic	Python	Java
Syntax	Python has a simpler and more concise syntax compared to Java.	Java has a more verbose syntax compared to Python.
Paradigm	Python is a multi-paradigm language that supports procedural, object-oriented, and functional programming paradigms.	Java is an object-oriented language that supports imperative and declarative programming paradigms.
Typing	Python is dynamically typed, which means that the type of a variable is determined at runtime.	Java is statically typed, which means that the type of a variable is determined at compile time.
Performance	Python is generally slower than Java due to its interpreted nature and dynamic typing.	Java is generally faster than Python due to its compiled nature and static typing.
Libraries and frameworks	Python has a vast collection of libraries and frameworks for various purposes, including data analysis, web development, and machine learning.	Java also has a wide range of libraries and frameworks, but not as many as Python, especially in the field of data analysis and machine learning.
Community and support	Python has a large and active community with a lot of online resources and support available.	Java also has a large community and a lot of resources available, but not as much as Python.
Learning curve	Python has a relatively easy learning curve due to its simple syntax and readability.	Java has a steeper learning curve compared to Python due to its verbose syntax and complex concepts like object-oriented programming.

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Java to python converter

This is simple basic alpha version of Java to Python code converter. The main goal of this tool is to provide functionality to deal with converting custom Java code into equivalent Python code.

Example of java to python

Here mentioned few examples which is based on arrays, strings and some useful packages which is generally used in java programming language.

Java array to python list

class MyArray < public static void main(String[] args) < // Simple array of integer elements int[] a = new int[]; int[][] b = new int[][],>; int[] c = new int[10]; System.out.println(a.length); System.out.println(b.length); System.out.println(c.length); > >

Converted Python

class MyArray : @staticmethod def main( args) : # Simple array of integer elements a = [1, 2, 3, 4, 5] b = [[1, 2, 3], [4, 5, 6]] c = [0] * (10) print(len(a)) print(len(b)) print(len(c)) if __name__=="__main__": MyArray.main([])

Java String to python string method

Converted Python

class MyString : @staticmethod def main( args) : a = "Abc" b = "ABCdec" # Abc print(a) # ABCdec print(b) # ABC print(a.upper()) # abcdec print(b.lower()) if __name__=="__main__": MyString.main([])

Java Hashmap to python dictionary

import java.util.HashMap; class MyHashMap < public static void main(String[] args) < HashMap < String, Integer >hm = new HashMap < String, Integer >(); hm.put("One", 1); hm.put("Ten", 10); hm.put("Year", 2022); // System.out.println(hm); // 3 System.out.println(hm.size()); > >

Converted Python

class MyHashMap : @staticmethod def main( args) : hm = dict() hm["One"] = 1 hm["Ten"] = 10 hm["Year"] = 2022 # print(hm) # 3 print(len(hm)) if __name__=="__main__": MyHashMap.main([])

How to convert Python to java ?

We were on our way to convert Python to Java. In which we faced some difficulty. That’s because, in Python, everyone acts like an object. But Java has its limitations. We can say that the task of converting from Python to Java is not easy, for this you have to keep the following things in mind.

AST Implementation : There are many ways to implement AST (abstract syntax tree), You can use python ast package to implement AST.

import ast code = "print('I am good')" result = ast.parse(code) print(ast.dump(result)) 

Module(body=[Expr(value=Call(func=Name(id='print', ctx=Load()), args=[Str(s='I am good')], keywords=[]))])

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Comment

Please share your knowledge to improve code and content standard. Also submit your doubts, and test case. We improve by your feedback. We will try to resolve your query as soon as possible.

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Java to Python Converter

Java to Python Converter produces great Python code, saving you hours of painstaking work and valuable time.

Try the Free Edition

Purchase the Premium Edition

Runs on 64-bit Windows, version 7 SP1 or later.
The Free Edition limits output to 100 lines per file (no limit on the number of files).

10 Second Preview

Converting Folders:

Java to Python String Conversion:

Java to Python Collections Conversion:

Java to Python Inheritance Conversion:

Java to Python Anonymous Inner Class Conversion:

Java to Python Exception Handling Conversion:

*Scroll right to see Java to Python Converter screenshots

Key Benefits

• Saves valuable time
• Accurate and comprehensive
• Easy to use
• Safe — your code never leaves your machine
• Responsive customer support
• 15 day money-back guarantee
• Flexible — converts snippets, files, and folders from Java to Python
• Fast — tens of thousands of lines converted from Java to Python per minute
• Helpful conversion comments
• Excellent educational tool for Java developers learning Python
• Numerous conversion and formatting options

FAQ

Q: Are the original Java files altered in any way?

Your existing code is left completely intact. The new Python files are output to the new location that you specify.

Q: What version of Java is converted?

We attempt to convert as much as possible and are continually updating the converter to handle newer Java features. However, some new Java features have no Python equivalent so the output will require adjustments.

Q: What is the conversion accuracy?

Our accuracy is very high, but there will be significant adjustments required for all but the simplest conversions. There are no direct equivalents for some aspects of Java. Read the rest of the FAQ to get an idea of a few things that are not converted. Java to Python Converter is intended to reduce the amount of work you’ll have to do to convert code to Python, but it is just the first step.

Q: How are anonymous inner classes handled?

Anonymous inner classes are converted to Python nested classes.

Q: What about Java UI code?

The converter does not convert Java UI types due to the lack of similarity between these types and Python UI types.

Q: Are Python type hints included?

The converter has an option to include Python type hints.

Q: What are the most common adjustments necessary after conversion?

• Java to Python Converter converts only some Java library types to Python equivalents.
• Python only allows a single class constructor, but the converter changes all constructors to __init__, so you will need to refactor multiple constructors manually.
• Method overloads are not allowed in Python. These are marked with a comment.
• The synchronized keyword for locking in Java is not converted.
• Java annotations are not converted by Java to Python Converter.
• Some switch expressions (Java 12) are not converted.
• Simple enums containing only enum values are converted. Complex enums are not converted.
• Only expression lambdas are converted, not multi-statement lambdas.
• Java documentation comments are not converted by Java to Python Converter.
• Java’s event handling model has no direct equivalent in Python.
• Java local classes are not converted by Java to Python Converter.

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