Author Question: Analyze the following code:public class Test1 { public Object max(Object o1, Object o2) {if ... (Read 112 times)

cherise1989 · **on:** May 6, 2020

Question 1

Suppose A is an interface, B is a concrete class with a default constructor that implements A. Which of the following is correct?
◦ B b = new B();
◦ B b = new A();
◦ A a = new A();
◦ A a = new B();

Question 2

Analyze the following code:

public class Test1 {
public Object max(Object o1, Object o2) {

if ((Comparable)o1.compareTo(o2) >= 0) {

return o1;

}

else {

return o2;

}

}
}

◦ The program would compile if ((Comparable)o1.compareTo(o2) >= 0) is replaced by (((Comparable)o1).compareTo(o2) >= 0).
◦ The program has a compile error because you cannot cast an Object instance o1 into Comparable.
◦ The program has a compile error because Test1 does not have a main method.
◦ The program has a compile error because o1 is an Object instance and it does not have the compareTo method.

billybob123 · **Reply #1 on:** May 6, 2020

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