Answer Posted / naveen

There is null check in the put method implementation of
hashtable, so it does not support null values and null keys.


public Object put(Object key, Object value) {
// Make sure the value is not null
if (value == null) throw new NullPointerException();
}

above is HashTable put method logic implemented by Sun.

What will be the default values of all the elements of an array defined as an instance variable?

780

---

What does java stand for?

786

---

What does the ‘static’ keyword mean? Is it possible to override private or static method in java?

768

---

Why packages are used?

858

---

What is an eror in java?

806

---

why Java does not support multiple inheritances?

920

---

What is the diffrence between inner class and nested class?

817

---

Convert a BST into a DLL and DLL to BST in place.

874

---

explain autoboxing in java?

775

---

Where are global variables stored?

698

---

Can we split string with in java?

749

---

Can we declare main () method as non static?

717

---

Is double bigger than float?

748

---

What is application tier?

782

---

What is indexof in java?

738

---