Find the error(s) in each of the following statements, and explain how to correct it (them): a) buttonName = JButton( "Caption" ); b) JLabel aLabel, JLabel; c) txtField = new JTextField( 50 , "Default...

a) buttonName = JButton("Caption");

b) JLabel aLabel, JLabel;

c) txtField =
new
JTextField(50,
"Default Text");

d) setLayout(new
BorderLayout());

button1 =
new
JButton("North Star");

button2 =
new
JButton("South Pole");

add(button1);

add(button2);