input: Write a function to convert a given Java code snippet to its equivalent Python 3 code. The function should take a string containing the Java code as input and return a string containing the equivalent Python 3 code. 
  
  def java_to_python(java_code):
      # Conversion logic here
      if "public class" in java_code:
          java_code = java_code.replace("public class", "").replace("public int", "def").replace("int ", "").replace("return ", "return ").replace(";", "")
      return java_code
  
  assert java_to_python("public class Foo { public int foo( int a, int b ) { return a + b; } }") == " Foo { def foo( a, b ) { return a + b } }"
  assert java_to_python("") == ""
output: def java_to_python(java_code):
      if "public class" in java_code:
          java_code = java_code.replace("public class", "class").replace("public int", "def").replace("int ", "").replace("return ", "return ").replace(";", "")
      return java_code