Which code snippet is valid?

Which characteristic does not apply to instances of java.util.HashSet=

What will this code print, assuming it is inside the main method of a class?System.out.println("hello my friends".split(" ")[0]);

You have an instance of type Map named instruments containing the following key-value pairs: guitar=1200, cello=3000, and drum=2000. If you add the new key-value pair cello=4500 to the Map using the put method, how many elements do you have in the Map when you call instruments.size()?

Which class acts as root class for Java Exception hierarchy?

Which class does not implement the java.util.Collection interface?

Suppose ArrayList x contains two strings [Beijing, Singapore]. Which method will cause the list to become [Beijing, Chicago, Singapore]?

A method is considered to be overloaded when:

What is displayed when the following code is compiled and executed? String s1 = new String('Test'); String s2 = new String('Test'); if (s1==s2) System.out.println('Same'); if (s1.equals(s2)) System.out.println('Equals');

What is a token?

________ is when a subclass implements a method that is already provided by a superclass.