Object-Oriented Software Development Using Java

Object-Oriented Software Development Using Java

Xiaoping Jia, Ph.D

Chapter 4: Elements of Java

Contents
   4.1 Lexical Elements
         4.1.1 Character Set
         4.1.2 Identifiers
         4.1.3 Primitive Types and Literals
         4.1.4 Operators and Expressions
   4.2 Variables and Types
         4.2.1 Variable Declarations
         4.2.2 Type Compatibility and Conversion
         4.2.3 Reference Types
         4.2.4 Arrays
   4.3 Statements
         4.3.1 Expression Statements
         4.3.2 Statement Blocks
         4.3.3 Local Variable Declarations
         4.3.4 The return Statement
         4.3.5 Selection Statements
         4.3.6 Loop Statements
         4.3.7 The break and continue Statements
   4.4 Class Declarations
         4.4.1 Syntax of Class Declarations
         4.4.2 Creating and Initializing Objects
         4.4.3 Accessing Fields and Methods
         4.4.4 Method Invocation and Parameter Passing
         4.4.5 Class (Static) Fields and Methods
         4.4.6 Object Reference this
         4.4.7 Interfaces and Abstract Classes
         4.4.8 Strings
         4.4.9 Wrapper Classes
   4.5 Packages
         4.5.1 Using Packages
         4.5.2 Partitioning the Name Space
         4.5.3 Packages and the Directory Structure
         4.5.4 Organization of the Java Class Library
   4.6 Exceptions
         4.6.1 Sources of Exceptions
         4.6.2 Hierarchy of Exceptions
         4.6.3 Throwing Exceptions
         4.6.4 Catching and Handling Exceptions
   4.7 A Simple Animation Applet

Example 4.1 The Sum of an Array of Integers

Source code: Sum.java
Compile:

javac Sum.java

Run:

java Sum

Example 4.2 Sorting an One-Dimentional Array Using Bubble Sort

Source code: BubbleSort.java
Compile:

javac BubbleSort.java

Run:

java BubbleSort

Example 4.3 Command Line Arguments

Source code: Arguments.java
Compile:

javac Arguments.java

Run:

java Arguments foo bar

Example 4.4 Copying from Standard Input to Standard Output

Source code: Copy.java
Compile:

javac Copy.java

Run:

java Copy < infile.txt > outfile.txt

Example 4.5 Copying Text Files

Source code: CopyTextFile.java
Compile:

javac CopyTextFile.java

Run:

java CopyTextFile infile.txt outfile.txt

Example 4.6 Breaking Colon-Delimited Records

Source code: BreakRecords.java
Compile:

javac BreakRecords.java

Input data: address.dat
Run:

java BreakRecords < address.dat

Example 4.7 Breaking Text into Words

Source code: Words.java
Compile:

javac Words.java

Input data: Lincoln.txt
Run:

java Words < Lincoln.txt

Example 4.8 The Minimum of an Array of Integers

Source code: Minimum.java
Compile:

javac Minimum.java

Run:

java Minimum

Example 4.9 The Max-Min Value of a Two-Dimensional Array

Source code: MaxMin.java
Compile:

javac MaxMin.java

Run:

java MaxMin

Example 4.10 Digital Clock Applet

Source code: DigitalClock.java
Compile:

javac DigitalClock.java

Run the applet using the appletviewer

appletviewer DigitalClockDemo.html

Run the applet in your browser

Other Examples

Class and instance fields

Source code: Robot.java
Compile:

javac Robot.java

Run:

java Robot

Singleton class

Source code: Singleton.java
Compile:

javac Singleton.java

String comparison

Source code: StringComparison.java
Compile:

javac StringComparison.java

Run:

java StringComparison

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