input: from typing import List
  
  def port_java_to_python(java_code: str) -> str:
      """ Converts a given Java code snippet to a Python 3 function.
      The Java code should be a simple class with a single method.
      >>> port_java_to_python("public class Foo { public int foo( int a, int b ) { return a + b; } }")
      'def foo(a, b):\\n return a + b'
      >>> port_java_to_python("public class Bar { public String bar( String x ) { return x + \"hello\"; } }")
      'def bar(x):\\n return x + \\"hello\\"'
      """
output:     
      import re
      java_code = java_code.strip()
      method_pattern = re.compile(r'public\s+(\w+)\s+(\w+)\s*\((.*?)\)\s*\{.*?return\s+(.*?);.*?\}', re.DOTALL)
      match = method_pattern.search(java_code)
      if match:
          return_type, method_name, params, return_statement = match.groups()
          params = re.sub(r'\s+', '', params)
          params = ', '.join(params.split(','))
          return_statement = re.sub(r'\"', '\\"', return_statement)
          return f"def {method_name}({params}):\n return {return_statement}"
      return ""
  