java泛型类

public abstract class Func{
public interface Func1<T, R>{
R apply(T t);
}

public interface Func2<T1,T2,R> {
R apply(T1 t1,T2 t2);
}

public interface Func3<T1,T2,T3,R> {
R apply(T1 t1,T2 t2,T3 t3);
}

public interface Func4<T1,T2,T3,T4,R> {
R apply(T1 t1,T2 t2,T3 t3);
}

}