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Questions and Answers
Java source files end with the .class extension.
Java source files end with the .class extension.
False (B)
What type of memory is RAM?
What type of memory is RAM?
A volatile type of memory, used only for temporary storage
What is the purpose of validating the results of the program?
What is the purpose of validating the results of the program?
Determine if the program solves the original problem
What do the methods that operate on the data allow?
What do the methods that operate on the data allow?
How many bits are in a byte?
How many bits are in a byte?
What does software refer to?
What does software refer to?
What are symbolic names made by the programmer that represent locations in the computer's RAM?
What are symbolic names made by the programmer that represent locations in the computer's RAM?
A(n) ____ is a software entity that contains data and procedures.
A(n) ____ is a software entity that contains data and procedures.
What was the original name for Java?
What was the original name for Java?
What is a computer program?
What is a computer program?
Encapsulation refers to the combining of data and code into a single object.
Encapsulation refers to the combining of data and code into a single object.
What is a special language used to write computer programs?
What is a special language used to write computer programs?
What are byte code instructions?
What are byte code instructions?
What is the data contained in an object known as?
What is the data contained in an object known as?
The Java Virtual Machine is a program that reads Java byte code instructions and executes them as they are read.
The Java Virtual Machine is a program that reads Java byte code instructions and executes them as they are read.
What does application software refer to?
What does application software refer to?
What is a set of programming language statements that, together, perform a specific task?
What is a set of programming language statements that, together, perform a specific task?
Because Java byte code is the same on all computers, compiled Java programs are highly portable.
Because Java byte code is the same on all computers, compiled Java programs are highly portable.
Application software refers to programs that make the computer useful to the user.
Application software refers to programs that make the computer useful to the user.
____ is a cross between human language and a programming language.
____ is a cross between human language and a programming language.
Whereas ____ is centered on creating procedures, ___ is centered on creating objects.
Whereas ____ is centered on creating procedures, ___ is centered on creating objects.
What is syntax?
What is syntax?
A characteristic of ___ is that only an object's methods are able to directly access and make the changes to the object's data.
A characteristic of ___ is that only an object's methods are able to directly access and make the changes to the object's data.
One of the design tools used by programmers when creating a model of the program is
One of the design tools used by programmers when creating a model of the program is
A runtime error is usually the result of
A runtime error is usually the result of
What are variables of the boolean data type useful for?
What are variables of the boolean data type useful for?
Variables are classified according to their?
Variables are classified according to their?
Which of the following statements will correctly convert the data type if x is a float and y is a double?
Which of the following statements will correctly convert the data type if x is a float and y is a double?
What is a named storage location in the computer's memory?
What is a named storage location in the computer's memory?
If you wish to use the System.out.printf method to print a string argument, use the ___ format specifier.
If you wish to use the System.out.printf method to print a string argument, use the ___ format specifier.
When saving a Java source file, save it with an extension of
When saving a Java source file, save it with an extension of
The System.out.printf method allows you to format output in a variety of ways.
The System.out.printf method allows you to format output in a variety of ways.
What will be displayed when the following code is executed? final int x = 22, y = 4; y += x; System.out.println("x = " + x + " y = " + y);
What will be displayed when the following code is executed? final int x = 22, y = 4; y += x; System.out.println("x = " + x + " y = " + y);
Character literals are enclosed in ___, and string literals are enclosed in ____.
Character literals are enclosed in ___, and string literals are enclosed in ____.
Which of the following is not a valid Java comment?
Which of the following is not a valid Java comment?
The simplest way you can use the System.out.printf method is
The simplest way you can use the System.out.printf method is
Identifiers can contain spaces.
Identifiers can contain spaces.
What will be the value of z as a result of executing the following code? int x=5, y=28; float z; z=(float)(y/x);
What will be the value of z as a result of executing the following code? int x=5, y=28; float z; z=(float)(y/x);
Which of the following statements is invalid?
Which of the following statements is invalid?
Named constants are initialized with a value and that value cannot change during the execution of the program.
Named constants are initialized with a value and that value cannot change during the execution of the program.
The primitive data types only allow a(n) ___ to hold a single value.
The primitive data types only allow a(n) ___ to hold a single value.
What output will be displayed as a result of executing the following code? int x = 5, y = 20; x+= 32; y/= 4; System.out.println("x=" + x + ", y=" + y);
What output will be displayed as a result of executing the following code? int x = 5, y = 20; x+= 32; y/= 4; System.out.println("x=" + x + ", y=" + y);
What would be displayed as a result of the following code? int x = 578; System.out.print("There are " + x + 5 + "\n" + "hens in the hen house.");
What would be displayed as a result of the following code? int x = 578; System.out.print("There are " + x + 5 + "\n" + "hens in the hen house.");
What will be the value of z after the following statements have been executed? int x=4, y=33; double z; z=(double)(y/x);
What will be the value of z after the following statements have been executed? int x=4, y=33; double z; z=(double)(y/x);
What is the result of the following expression?
What is the result of the following expression?
When you call one of the Scanner class's methods to read a primitive value, an annoying and hard-to-find problem can occur.
When you call one of the Scanner class's methods to read a primitive value, an annoying and hard-to-find problem can occur.
In the following Java statement what value is stored in the variable name? String name="John Doe";
In the following Java statement what value is stored in the variable name? String name="John Doe";
A Java program must have at least one
A Java program must have at least one
Both character literals and string literals can be assigned to a char variable.
Both character literals and string literals can be assigned to a char variable.
This is a value that is written into the code of a program.
This is a value that is written into the code of a program.
What is the following statement an example of? import java.util.Scanner;
What is the following statement an example of? import java.util.Scanner;
Both the things a class is responsible for knowing and the things a class is responsible for doing?
Both the things a class is responsible for knowing and the things a class is responsible for doing?
When an object is created, the attributes associated with the object are called?
When an object is created, the attributes associated with the object are called?
To indicate the data type of a variable in a UML diagram, you specify?
To indicate the data type of a variable in a UML diagram, you specify?
Data hiding, which means that critical data stored inside the object is protected from code outside the object, is accomplished in Java by?
Data hiding, which means that critical data stored inside the object is protected from code outside the object, is accomplished in Java by?
Class objects normally have ________ that perform useful operations on their data, but primitive variables do not.
Class objects normally have ________ that perform useful operations on their data, but primitive variables do not.
The scope of a local variable is?
The scope of a local variable is?
What is the following statement an example of? import java.util.*;
What is the following statement an example of? import java.util.*;
When an argument is passed by value,?
When an argument is passed by value,?
UML diagrams do not contain object names.
UML diagrams do not contain object names.
A method may have zero or more parameter variables.
A method may have zero or more parameter variables.
In UML diagrams, what symbol indicates that a member is public?
In UML diagrams, what symbol indicates that a member is public?
Another term for an object of a class is a(n)?
Another term for an object of a class is a(n)?
What does the keyword new do?
What does the keyword new do?
One or more objects may be created from a(n)?
One or more objects may be created from a(n)?
In the blueprint/house analogy, think of a class as a blueprint that describes a house and ________ as instances of the house built from the blueprint.
In the blueprint/house analogy, think of a class as a blueprint that describes a house and ________ as instances of the house built from the blueprint.
What is a group of related classes called?
What is a group of related classes called?
Which of the following is not involved in finding the classes when developing an object-oriented application?
Which of the following is not involved in finding the classes when developing an object-oriented application?
You should not define a class field that is dependent upon the values of other class fields in order to?
You should not define a class field that is dependent upon the values of other class fields in order to?
If you do not provide initialization values for a class's numeric fields, they will be automatically initialized with 0.
If you do not provide initialization values for a class's numeric fields, they will be automatically initialized with 0.
It is common practice in object-oriented programming to make all of a class's?
It is common practice in object-oriented programming to make all of a class's?
After the header, the body of the method appears inside a set of?
After the header, the body of the method appears inside a set of?
A UML diagram uses the ________ symbol to indicate that a member is private.
A UML diagram uses the ________ symbol to indicate that a member is private.
Methods that operate on an object's fields are called?
Methods that operate on an object's fields are called?
For the following code, which statement is not true? public class Sphere { private double radius; public double x; private double y; private double z; }
For the following code, which statement is not true? public class Sphere { private double radius; public double x; private double y; private double z; }
What is import scanner?
What is import scanner?
What is the declaration for scanner?
What is the declaration for scanner?
How do you close the scanner?
How do you close the scanner?
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Study Notes
Java Basics
- Java source files utilize the .java extension; .class is for bytecode.
- RAM (Random Access Memory) is a volatile memory used for temporary data storage.
- Validating program results ensures that it effectively solves the intended problem.
Object-Oriented Programming
- Objects encapsulate data and methods, hiding internal data while providing access through defined procedures.
- Variables serve as symbolic names representing locations in a computer's memory.
- Encapsulation combines data and functionality within a single unit, ensuring data security.
Programming Fundamentals
- A computer program is a structured set of instructions that solve problems or perform tasks.
- Software is a term used to describe programs executed by a computer.
- Java bytecode is platform-independent, leading to high portability across different systems.
Data Types and Variables
- Variables can hold data classified by their data types, including primitive data types that store single values.
- Boolean variables evaluate conditions as true or false, essential for control flow in programming.
Java Syntax and Identifiers
- Syntax comprises specific rules programming code must adhere to; identifiers cannot contain spaces.
- Named constants in Java are immutable once initialized, providing stability in code.
Exception Handling
- A runtime error often results from logical errors in code execution.
- Understanding how errors manifest helps in debugging Java applications effectively.
Program Structures
- The UML (Unified Modeling Language) diagram indicates relationships between classes, identifying attributes and methods.
- A class definition is fundamental for creating objects, establishing a blueprint for data structure and functionality.
Input and Output Management
- The System.out.printf method formats output, and the simplest usage requires only a format string.
- User input handling often involves the Scanner class, a common approach for reading data in Java applications.
Scoping and Accessibility
- Local variables' scope is restricted to the method in which they are defined.
- Data hiding ensures object fields are protected from outside interference, promoting encapsulation principles.
Class Relationships
- A class may produce multiple object instances, referred to as instances.
- Packages group related classes, enhancing organization within the programming structure.
Best Practices in Programming
- Following conventions, such as keeping fields private, enhances data security.
- Avoid defining class fields based on others to maintain clean, understandable code.
Fundamental Operations
- An implicit conversion of data types can be performed while assigning values.
- The keyword
newis crucial for object instantiation in memory.
Summary of Common Features
- Comments serve as documentation within code but cannot be enclosed improperly.
- Understanding the context of variable manipulations is essential for predictable program behavior.
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