Defining classes in java - Study guides, Class notes & Summaries

What is the main() method? the gateway between the startup of a java process and the beginning of a programmers code. The main() method allows us to hook our code onto a process. What are the rules of defining classes in files? Each file must only have one public class and its name must be same as the file. Classes that are not public can also be in the file. what is an access modifier? declares the level of exposure to potential callers in the program. e.g. private, public, protected W...

Abstract classes used when: Common abstract methods to be re-used for different clients. 'Extend' the class. Abstract classes do not have pre-defined methods, only abstract methods. T/F? False. Abstract class must have at least one abstract method, rest may be initiated pre-defined methods. Interfaces used when: All abstract methods and no pre-defined methods. 'Implement' the class. Local (method) variables must be defined but not initialized. T/F? False. Local vari...

What year was the Java programming created 1995 What does OCA stand for Oracle Certified Associate What are the 2 tests for Java developers provided by Oracle OCA and OCP The full declaration of a method is called the method ____ signature True or False - can you add a multiline comment within a multiline comment? false How many public classes can be added to a single file 1 Write the syntax for the main method. public static void main(String[] ar...

OCA Chapter 1 Exam Questions & Answers 2023/2024 Defining a Class - ANSWER-Describing parts & characteristics of building blocks. Need to create an object in order to use. Object - ANSWER-Runtime instance of a class in memory Sits on heap and does not have name Cannot be assigned to another object, passed or returned Gets garbage collected Two Primary Elements of Java Classes/Members - ANSWER-Methods & Fields Methods - ANSWER-Functions/Procedures that operate on the state of the...

What year was the Java programming created 1995 What does OCA stand for Oracle Certified Associate What are the 2 tests for Java developers provided by Oracle OCA and OCP The full declaration of a method is called the method ____ signature True or False - can you add a multiline comment within a multiline comment? false How many public classes can be added to a single file 1 Write the syntax for the main method. public static void main(String[] ar...

Apex Workbook . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Part 1: Orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Creating Warehouse Custom Objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Using the Developer Console . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Activati...

Reference Types Refers to an object, doesn't hold the value of the object they refer to, and stores the memory address where the object is located. Can be assigned null. Object Instance of a class Primitive Types Boolean, int, byte, double, float, long, don't have methods declared to them. Literal Fixed value that doesn't need further calculations in order to be assigned to a variable Local Variables Defined within a method, must be initialized before use. In ...

A Programmer’s Guide to Java™ SCJP Certification Third Edition This page intentionally left blank A Programmer’s Guide to Java™ SCJP Certification A Comprehensive Primer Third Edition Khalid A. Mughal Rolf W. Rasmussen Upper Saddle River, New Jersey • Boston • Indianapolis • San Francisco New York • Toronto • Montreal • London • Munich • Paris • Madrid Capetown • Sidney • Tokyo • Singapore • Mexico City Many of the designations used by manufacturers...

Chapter 3 Flow of Control  Multiple Choice 1) An if selection statement executes if and only if: (a) the Boolean condition evaluates to false. (b) the Boolean condition evaluates to true. (c) the Boolean condition is short-circuited. (d) none of the above. Answer: B 2) A compound statement is enclosed between: (a) [ ] (b) { } (c) ( ) (d) < > Answer: B 3) A multi-way if-else statement (a) allows you to choose one course of action. (b) always executes the else statement. (c...

OCA Exam Questions & Answers 2023/2024 Can you have static classes in Java? - ANSWER-Yes and no. You cannot have top-level static classes, but you may have nested static classes (these are mainly used in defining one-off, utility and/or library classes where instantiation would not make sense). You can basically declare the class final to mimic static class behavior since you wouldn't want to extend a static class in the first place. ArithmeticException - ANSWER-Thrown by the JVM when c...