1.
part 1 Consider the following piece of code: Person p = null;
p.speak();
a) Does it compile? Explain.
b) Does it execute? Explain.
part 2 You are given three variables p, q, and r of type Person. The three variables have been
correctly initialized. Write a piece of code that writes the initial value of p in q, the initial value
of q in r, and the initial value of r in p. Try to make your code as compact as possible.
Please help me with Java question. Thank you!
Solution
Question 1:
Answer:
a) Yes. it will compile.
b) No. It will not execute. During execution we will get runtime exception becuase p object
is not initialized. So object p value is null. we can not call any functon by object which is
havnig null. if we try to call then will get NullPointerException.
Question 2:
Answer:
Person p =new Person();
Person q =new Person();
Person r =new Person();
Person temp =new Person();

2.
temp = r;
r = q;
q = p;
p = temp;