Source Code in This Chapter

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• DropBall.java Uses a while loop to determine how long it takes a ball to fall from the top of the Washington Monument to the ground.
• Factorial.java Computes an exact factorial, n!, using a BigInteger.
• NumFormat.java Formats real numbers with DecimalFormat.
• Exec.java Provides static methods for running external processes from applications. ExecTest.java illustrates use of the Exec class.
• ReferenceTest.java Demonstrates the behavior of object references.
• ModificationTest.java Demonstrates changing fields of an object. Inherits from ReferenceTest.java.
• InstanceOf.java Tests the class type of an object using the isInstance method (preferred over instanceof operator).
• StringTest.java Demonstrates various methods of the String class.
• Golf.java Illustrates the use of arrays.
• TreeTest.java Builds a binary tree and prints the contents of the nodes. Uses the following classes:
  • Node.java A data structure representing a node in a binary tree.
  • NodeOperator.java An interface used in the Node class to ensure that an object has an operateOn method.
  • Leaf.java A leaf node with no children.
• URLTest.java Demonstrates try/catch blocks.
  • Simplified getURL method.
  • Further simplified getURL method.
• NegativeLengthException.java Illustrates defining and throwing your own exceptions.

• Syntax as defined by the Java Language Specification
• Unicode standard
• Java implementation of printf by Jef Poskanzer
• Java Collections Framework