Exam 3: Using Classes and Objects

Rewrite the following five assignment statements into a single statement using prefix and postfix increment and decrement operators as necessary. Assume all variables are int variables. x = y + 1; y = y + 1; z = z - 1; x = x - z; x = x + 1;

For the program to get a name interactively a Scanner object must be instantiated. Write the Java statement to do this.

Why does one set up a containment hierarchy?

What happens if you attempt to use a variable before it has been initialized?

The main difference between a frame and a panel is

These two ways of setting up a String yield identical results: a) String string = new String("123.45"); b) String string = "" + 123.45;

Layout managers are associated with

What is the purpose of the ImageIcon class?

Which of the following GUI components is used to accept input into a JFrame?

What is autoboxing?

The advantage(s) of the Random class' pseudo-random number generators, compared to the Math.random method, is that

If two variables contain aliases of the same object then

Write a statement using a method to guarantee that the initial will be a capital letter.

In Java, the symbol "=" and the symbol "==" are used synonymously (interchangeably).

Say you write a program that makes use of the Random class, but you fail to include an import statement for java.util.Random (or java.util.*). What will happen when you attempt to compile and run your program.

JOptionPane is a class that provides GUI

Autoboxing is

In Java, "instantiation" means

The Swing package

What is the difference between a heavyweight and a lightweight container?