i'm new for java how can i add a button or others like Microsoft visual studio?
If you are looking for the Eclipse IDE to help with the development of Java applications, this can be found on eclipse.org.
Though I'm not sure I understood your question correctly.
If you mean that you want a GUI builder, you'd better consider NetBeans with its Matisse. I think it is the most popular now for Swing apps.
This Google search shows a number of GUI builders for Eclipse
Many people prefer building GUI in Swing manually (just writing code) because it is by far not that difficult as in MSVC++ applications.
What you are looking for is Eclipse Visual Editor. However, as pointed out by others, the GUI Builder from NetBeans (formerly known as Matisse) is more popular for Swing development.
Download Netbeans, its visual editor is very good, and will give you a the perfect Swing User Interface. Its also very easy to use.
When making desktop applications, i always do it with Netbeans, if i know the application will be more complicated later, then i do only one or two JFrame classes with Netbeans, and use them in a new project in Eclipse :)