cpp,java,csharp,delphi,vb等的相互转换问题

cpp,java,csharp,delphi,vb(vb.net)这几种语言如何相互转换？目前delphi,vb(vb.net)，java
都可以向csharp转换的工具，当然不能保证100％。
1.Delphi2CS
Delphi2CS is an assistant tool that converts Delphi code to C#. Delphi2CS creates a new project,
converts each file from the original project(.dpr) into the new project(.csproj), and generates a report
detailing what was done. After your project is converted, Delphi2CS inserts comments into your C#
code alerting you to statement that will need to be changed.
2.BabbelFisken
VB.NET to C# Conversion, along with Delphi to C#, and VB6 to C#.
3.ConvertCSharp2VB
Convert C# to VB .NET
4.VB.Net to C# converter
sharpdevelop
http://www.developerfusion.com/utilities/convertvbtocsharp.aspx
http://www.vbconversions.com
http://www.halsvik.net/CSconv/CSconv.zip
5.Convert C# to VB .NET
6.Convert C to Java

c2j (commercial, closed-source)
Jazillian (closed-source, web service)
c2java (closed source).
7.Microsoft Java Language Conversion Assistant 2.0
Convert java to c#