Compile error when using multiple generic bounds

Question

I am trying to define a generic method whose parameter is bound by two types, but it doesn't seem to work:

public static <T extends Readable, Appendable> void doSomething(T t) {
    int r = t.read(...); // compiles OK
    //
    t.append(...); // compile error
}

This should compile. Can anyone see what I'm doing wrong?

Answer 1

The problem is that the method defines two parameters, one called T and one called Appendable, not one parameter with two bounds.

The comma should be an ampersand, like this:

public static <T extends Readable & Appendable> void doSomething(T t) {
    //
}