Concrete vs Abstract

Question 1

What is the difference between Concrete and Abstract classes?

Answer 1

Concrete classes can instantiate instances, abstract classes cannot be instantiated and can use methods defined in them

Question 2

JFrame (Concrete or Abstract?)

Answer 2

concrete

Question 3

JButton (Concrete or Abstract?)

Answer 3

concrete

Question 4

JComponent (Concrete or Abstract?)

Answer 4

Abstract

Question 5

JLabel (Concrete or Abstract?)

Answer 5

concrete

Question 6

JTextField (Concrete or Abstract?)

Answer 6

concrete

Question 7

JTextArea (Concrete or Abstract?)

Answer 7

concrete

Question 8

JApplet (Concrete or Abstract?)

Answer 8

concrete

Question 9

JContainer (Concrete or Abstract?)

Answer 9

Abstract