True or False?

The Formatter class allows you to append to a file.

Example syntax for opening a file for reading is:

Scanner sc = new Scanner(sales.txt");

The Scanner class allows you to parse your input file as you read it in.

In the Java API, Maps inherit from the interface Collection.

You could use Collections.sort() to sort a HashSet.

Implementations of the Map interface provided by the Java API include WeakHashMap and HashTable.

The length() method for ArrayList will return the number of elements in the list.

You need to provide an estimate on the maximum number of elements you might store in an ArrayList when allocating memory for an ArrayList.

Duplicate keys are allowed in a TreeMap.

Before inserting a value into a TreeSet, you need to make sure it hasnt already been added to the TreeSet.

You cannot store user-defined objects into an ArrayList.

Example syntax for opening a file for reading is:

BufferedReader in = new BufferedReader(new FileReader("stars.txt"));

FileWriter allows you to append to a file.

The setText() method can be used to set the value of a jTextField.

The isSelected() method can be used to determine if a jRadioButton has been selected.

A Swing application uses GUI components from the java.swing package.

To write out a platform independent line separator to a file, you could write out the String that is returned from System.getProperty (line.separator).

You could use the printf() method to write formatted output to a file if you use PrintWriter.

You could use the hasNext() method on the Scanner class to see if you had more data to read in.

You could use the value returned from the getText() method on the jTextField class in a mathematical operation without first converting to a numeric type.