Podcast
Questions and Answers
Which characteristic of Java allows it to run on any correctly implemented Java system?
Which characteristic of Java allows it to run on any correctly implemented Java system?
- Platform independence (correct)
- Object-oriented programming
- Embedded in web pages
- Rich collection of packages
Java is only designed for use in desktop applications.
Java is only designed for use in desktop applications.
False (B)
Name one predefined class in Java that is commonly used for input and output operations.
Name one predefined class in Java that is commonly used for input and output operations.
JOptionPane
Java is structured in terms of __________, which group data with operations on that data.
Java is structured in terms of __________, which group data with operations on that data.
Match the following Java features with their definitions:
Match the following Java features with their definitions:
What keyword indicates a static method in Java?
What keyword indicates a static method in Java?
Java methods can modify the value of the caller's primitive type arguments.
Java methods can modify the value of the caller's primitive type arguments.
What type of method is referred to as an instance method?
What type of method is referred to as an instance method?
In Java, all method arguments are passed by __________.
In Java, all method arguments are passed by __________.
Match the following types of method arguments with their characteristics:
Match the following types of method arguments with their characteristics:
What does a Java source code compiler produce?
What does a Java source code compiler produce?
A Java class must be defined in a file whose name matches the class name.
A Java class must be defined in a file whose name matches the class name.
What is the role of a Java Virtual Machine?
What is the role of a Java Virtual Machine?
A class describes ________ having common characteristics.
A class describes ________ having common characteristics.
Match the following terms with their definitions:
Match the following terms with their definitions:
What characteristic of a class provides operations that can be performed on objects?
What characteristic of a class provides operations that can be performed on objects?
Java programs can consist of only one class.
Java programs can consist of only one class.
What is produced by compiling a Java source code file?
What is produced by compiling a Java source code file?
Which of the following operators are used for logical or relational operations in Java?
Which of the following operators are used for logical or relational operations in Java?
In Java, the operator '>>>' represents a signed shift operation.
In Java, the operator '>>>' represents a signed shift operation.
What does the 'API' in Java stand for?
What does the 'API' in Java stand for?
What is a widening conversion in Java?
What is a widening conversion in Java?
When converting a byte to a larger numeric type, the correct order is byte, _____, int, long.
When converting a byte to a larger numeric type, the correct order is byte, _____, int, long.
The main method in Java is the entry point for execution of a program.
The main method in Java is the entry point for execution of a program.
What package would you import to use classes for graphical user interface in Java?
What package would you import to use classes for graphical user interface in Java?
Match the following Java operators with their function:
Match the following Java operators with their function:
In Java, an _______ statement tells the compiler to make available classes and methods of another package.
In Java, an _______ statement tells the compiler to make available classes and methods of another package.
Which operator is used for conditional expressions in Java?
Which operator is used for conditional expressions in Java?
The operator 'new' in Java is used for object creation.
The operator 'new' in Java is used for object creation.
What is the result of the command 'javac HelloWorld.java'?
What is the result of the command 'javac HelloWorld.java'?
Match the Java packages with their descriptions:
Match the Java packages with their descriptions:
What is the role of the assignment operator '=' in Java?
What is the role of the assignment operator '=' in Java?
The keyword 'static' in Java implies that a method is part of an object.
The keyword 'static' in Java implies that a method is part of an object.
What does the command 'java HelloWorld' do?
What does the command 'java HelloWorld' do?
Which of the following is NOT a primitive data type in Java?
Which of the following is NOT a primitive data type in Java?
The boolean data type can hold more than two values.
The boolean data type can hold more than two values.
What is the range of values for a short data type?
What is the range of values for a short data type?
The ______ data type in Java is used to represent characters.
The ______ data type in Java is used to represent characters.
What is the range of values for a long data type?
What is the range of values for a long data type?
The float data type in Java can represent very large numbers, but has approximately 15 digits of precision.
The float data type in Java can represent very large numbers, but has approximately 15 digits of precision.
Which primitive data type is used for true/false values?
Which primitive data type is used for true/false values?
Match the following Java primitive data types with their descriptions:
Match the following Java primitive data types with their descriptions:
Flashcards
Java platform independence
Java platform independence
Java programs can run on any system with a correctly implemented Java environment, without needing changes.
Object-Oriented Programming (OOP) in Java
Object-Oriented Programming (OOP) in Java
Java organizes code using classes. Classes combine data (attributes) and actions (methods) related to that data.
Java Primitive Data Types
Java Primitive Data Types
Fundamental data types used in Java, like int
, double
, boolean
for storing numbers, decimals, and true/false values.
Java Control Structures
Java Control Structures
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Java Packages
Java Packages
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Java Source Code
Java Source Code
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Bytecode
Bytecode
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Java Compiler
Java Compiler
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Class File
Class File
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Java Virtual Machine (JVM)
Java Virtual Machine (JVM)
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Class
Class
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Object (instance)
Object (instance)
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Data Fields
Data Fields
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Java API
Java API
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Java Package
Java Package
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Swing Package
Swing Package
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AWT Package
AWT Package
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util Package
util Package
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import statement
import statement
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main method
main method
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javac command
javac command
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Primitive Types (Java)
Primitive Types (Java)
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Reference Variables
Reference Variables
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Integer Data Types (Java)
Integer Data Types (Java)
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Floating-Point Types (Java)
Floating-Point Types (Java)
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Character Type (Java)
Character Type (Java)
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Boolean Type (Java)
Boolean Type (Java)
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Data Type Range (byte)
Data Type Range (byte)
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Data Type Range (int)
Data Type Range (int)
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Java Method
Java Method
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Static Method
Static Method
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Instance Method
Instance Method
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Call-by-value (Primitives)
Call-by-value (Primitives)
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Call-by-value (Objects)
Call-by-value (Objects)
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Operator Types
Operator Types
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Widening Conversions
Widening Conversions
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Mixed-Type Operands
Mixed-Type Operands
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Assignment Operators
Assignment Operators
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Comparison Operators
Comparison Operators
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Arithmetic Operators
Arithmetic Operators
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Sequential Logical Operators
Sequential Logical Operators
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Data Type Conversion
Data Type Conversion
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Study Notes
Computer Programming-2, Lecture 1
- The lecture is about Java Programming
- The course material is from Liang's "Introduction to Java Programming" Eighth Edition, copyright 2011
- The textbook ISBN is 0132130807
Introduction to Java
- This section introduces Java
Topics of the Review
- Essentials of object-oriented programming in Java
- Java primitive data types, control structures, and arrays
- Predefined classes: Math, JOptionPane, I/O streams, String, StringBuffer, StringBuilder, StringTokenizer
- Writing and documenting your own Java classes
Some Salient Characteristics of Java
- Java is platform-independent; the same program runs on any correctly implemented Java system
- Java is object-oriented
- Structured in terms of classes that group data with operations on that data
- Constructs new classes by extending existing ones
- Java is designed as a core language plus a rich collection of commonly available packages
- Java can be embedded in web pages
Java Processing and Execution
- Begin with Java source code in text files (e.g., Model.java)
- A Java source code compiler produces Java byte code (outputs one file per class: Model.class)
- A Java Virtual Machine loads and executes class files; may compile to native code (e.g., x86) internally
Compiling and Executing a Java Program
- Java source files are compiled to bytecode
- The bytecode is then run by the Java Virtual Machine (JVM)
Classes and Objects
- The class is the unit of programming
- A Java program is a collection of classes
- Each class definition is usually in its own .java file. File name matches class name
- A class describes objects (instances)
- Describes their common characteristics (a blueprint)
- All instances have these same characteristics
- Characteristics include data fields and methods (operations)
Grouping Classes: The Java API
- API = Application Programming Interface
- Java is a small core with an extensive collection of packages
- Packages consist of related Java classes
- Swing: GUI package
- AWT: Application Window Toolkit (more GUI)
- util: utility data structures (important to CS 187!)
- Import statement makes classes and methods available from another package
- A main method indicates where execution of a program begins
A Little Example of import and main
- import javax.swing.*;
- public class HelloWorld
- public static void main(String[] args)
- public = can be seen from any package
- static = not part of an object
Processing and Running HelloWorld
- javac HelloWorld.java (produces the HelloWorld.class file)
- java HelloWorld (runs the program)
References and Primitive Data Types
- Java distinguishes primitive types and objects
- Primitive-type data is stored in primitive-type variables
- Reference variables store the address of an object
- No notion of "object physically in the stack" or "object physically within an object"
Primitive Data Types
- Represent numbers, characters, Boolean values
- Integers: byte, short, int, long
- Real numbers: float, double
- Characters: char
Primitive Data Types (continued)
- Table with data type and range of values (e.g., byte: -128 to 127)
Primitive Data Types (continued- table)
- Shows first 128 Unicode symbols
Operators
- Summary of operators in Java
Operators (continued)
- Summary of operators in Java (logical, conditional, assignment)
Type Compatibility and Conversion
- Widening conversion: In operations on mixed-type operands, the numeric type of the smaller range is converted to the numeric type of the larger range. Also in assignments
- byte to short to int to long; int to float to double
Declaring and Setting Variables
- Declaring int square; square = n * n;
- Declaring double cube = n*(double)square;
- Variables get a safe initial value (zero/null)
Referencing and Creating Objects
- Declaring reference variables (they reference objects of specified types)
- Two reference variables can reference the same object
- The new operator creates an instance of a class
- A constructor executes when a new object is created
- Example: String greeting = "hello";
Java Control Statements
- A group of statements executes in order
- Control statements alter the sequential flow of execution
Java Control Statements (continued)
- Table with various control structures (if/else, switch, while, for, do-while); their purposes, and syntax
Methods
- A Java method defines a group of statements as performing a particular operation,
- static indicates a static or class method
- Method arguments are passed call-by-value
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Description
This quiz covers the foundational concepts of Java programming as outlined in Liang's 'Introduction to Java Programming'. Topics include object-oriented programming essentials, Java data types, control structures, and predefined classes. Get ready to test your knowledge on writing and documenting Java classes!