小编use*_*552的帖子

运行Java 1.8 JavaSE-1.8(jdk1.8.0_20)

这个班:

public class SimpleQuestion {

    public static void main(String[] args) {
        DoNothing();
        DoNothing2();
        DoNothing3();
        DoNothing4();
    }    

    public interface Interface1 {
        public void go();
    }

    public interface Interface2<X> {
        public X go2();
    }

    private static <X, T extends Interface2<X> & Interface1> void DoNothing() {
        return;
    }

    private static <X, T extends Interface2 & Interface1> void DoNothing2() {
        return;
    }

    private static <X, T extends Interface2<X>> void DoNothing3() {
        return;
    }

    private static <T extends Interface2<T> & Interface1> void …