Java class - Study guides, Class notes & Summaries

Java Developer OCA; Questions and Answers 100% Pass .java CORRECT ANSWER-A Java class is described in a text file with a ______ extension import CORRECT ANSWER-The ______ keyword defines other classes or groups of classes that you are using in your class class CORRECT ANSWER-The ______ keyword precedes the name of a class public CORRECT ANSWER-The name of the class and the file name must match when the class is declared _______

AP Computer Science A - Review 1 Latest Update 100% Pass What is the difference between an `ArrayList` and an array in Java? An `ArrayList` is a resizable data structure that can grow and shrink dynamically, whereas an array has a fixed size. Additionally, `ArrayList` provides methods for manipulating the list, such as adding, removing, and searching for elements. What is inheritance, and how does it work in Java? Inheritance allows a new class (subclass) to inherit properties...

The correct syntax for the "main" method signature is: *a.* private static void main(String[] args) *b.* public static String main(String[] args) *c.* public static void main(String[] args) *d.* public void main(String[] args) *e.* none of the above - Answer-c The Java compiler does the following: *a.* checks a bytecode program in a ".class" file for run-time errors and if there are none, it generates source code for that program in a ".java" file *b.* checks a source code pr...

Package - ANSWERAll java classes are part of a package. 1) It must be the first statement in a class. 2) Classes and interfaces in the same package can use each other without prefixing their names with the package name. 3) To use a class or interface from another package must use a full, qualified name (unless imported). 4) Should be the first line of a class file unless preceded by a Comment 4) applies to all classes/interfaces in class file 5) lower case names 6) separated from subs by dot ...

Which of these packages is automatically loaded, so you don't need to import it? 1. t 2. 3. g 4. - ANSWER4. 100% S is an object of the class _________________. 1. Applet 2. Output 3. System 4. PrintStream - ANSWER4. PrintStream 100% Which of these shows the correct way to print a literal number? 1. Sln({123.75}); 2. Sln("123.75"); 3. Sln('123.75'); 4. Sln(123.75); 100% - ANSWER4. Sln(123.75); 100% According to the CS 170 style rules, every method an...

The correct syntax for the "main" method signature is: *a.* private static void main(String[] args) *b.* public static String main(String[] args) *c.* public static void main(String[] args) *d.* public void main(String[] args) *e.* none of the above - Answer- c The Java compiler does the following: *a.* checks a bytecode program in a ".class" file for run-time errors and if there are none, it generates source code for that program in a ".java" file *b.* checks a source code p...

A method to find in a class instance data without needing to pass them as parameters or declare them as local variables - Answer-true Every class definition must include a constructor - Answer-False While multiple objects of the class can exist in a giver program there can be only one version of each class - Answer-True Accessors and mutators provide mechanisms for controlled access to a well encapsulated class - AnswerTrue All Java classes must contain a main method which is the first met...

AP COMPUTER SCIENCE A UNIT 1 QUIZ GRADED A+ What is a `class` in Java? A class in Java is a blueprint for creating objects. It defines the properties (attributes) and behaviors (methods) that the objects of that class will have. Explain the difference between a `primitive data type` and a `reference data type`. A primitive data type holds simple values like integers, characters, and booleans. A reference data type holds references to objects, such as arrays or instances of cla...

Interview Questions (Java Developer); Questions and Answers 100% Pass What is a immutable class? Correct answer-A defined class where state of the object cannot be modified. What is the default sorting order in TreeMap? Correct answer-Natural Ordering What is the difference between wait() and sleep() Correct answer-wait is from the object class, used from synchronized object block until lock is acquired . Simply used for thread synchronization

COP 3330 JAVA Question and answers already passed 2024 COP 3330 JAVA In OOP, developers create objects which contain ----- - correct answer data and methods Which of the following is an advantage of OOP vs procedural programming? - correct answer -provides a clear structure for programs -makes the code easier to maintain, modify and debug -faster and easier to execute What term best describes Cat? public class Cat { private String name; private String color; public S...