Microsoft created J++ which was Java but with extensions that only worked on Windows. In Visual Studio, these extensions were enabled by default so programmers

Microsoft created J++ which was Java but with extensions that only worked on Windows. In Visual Studio, these extensions were enabled by default so programmers were unwittingly writing software that only worked in Windows thinking they were writing cross platform Java code. This was a very sneaky move that went totally against Java's write once, run anywhere moto. Microsoft was sued and a judge ruled against them. They were forced to disable the Microsoft only extensions in Visual Studio and warn developers that they were creating Microsoft specific code when the extensions were enabled. Microsoft got mad, went home and broke all their toys. Next day they came back with C#. https://www.cnet.com/news/sun-microsoft-settle-java-suit/ https://www.cnet.com/news/sun-microsoft-settle-java-suit/