I lately knew that i have to use java scripct or C# to develop games. But can I also use Java to develop games when not which engine could i use to develop game seith java
Javascript (actually Unity Script) is not going to stay here long; it’s being phased out. C# will be the only language used in Unity, afaik.
As for Java, perhaps trying searching for that on the internet 
There is no use of Java in Unity.
As for other engines that use Java. Well… this is a Unity forum.
- we probably know more about Unity than other engines
- we probably would want to promote Unity over other engines
- we’re not your google machine
If you’re asking if Unity supports Java, the answer is no. Unity’s implementation of JavaScript, called Unity Script, is deprecated, so if you want to use Unity you’ll need to learn C#.
Fortunately C# and Java are fairly similar languages, so your learning curve should be minimal. Realistically you’ll spend more time learning how Unity wants you to code games than you will learning C# itself.