Which of the following is true for every class in Java? Every class in Java implements one or more interfaces. Every class in Java implements exactly one interface. Every class in Java (excluding the Object class) implements exactly one interface. Every class in Java implements zero or more interfaces. Every class in Java implements zero or one interfaces.. Every class in Java (exluding the Object class) implements one or more interfaces.

Which of the following is true for every class in Java? Every class in Java implements one or more interfaces. Every class in Java implements exactly one interface. Every class in Java (excluding the Object class) implements exactly one interface. Every class in Java implements zero or more interfaces. Every class in Java implements zero or one interfaces.. Every class in Java (exluding the Object class) implements one or more interfaces.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Consider the following Java interface definition: public interface Mover { public int getX(); public int getY(); public void setLocation(int x, int y); } Which of the following is a correct implementation of the Mover interface? O A. public class Cartoon Character implements Mover{ private int x, y; public int getX() { public int getY() { } O B. public class Cartoon Character implements Mover{ private int x, y; public int getX(); public int getY(); public void setLocation(int x, int y); // code for method body} // code for method body} } O C. public class Cartoon Character implements Mover{ private int x, y; public int getX; public int getY; public void setLocation; } O D. public class Cartoon Character implements Mover{ private int x, y; public int getX() { // code for method body} public int getY() { // code for method body} public void setLocation(int x, int y){ // code for method body} }
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1. Write a Graph class in Java. This class should represent undirected graphs. You can choose one of the representationsfrom object model, sets of nodes and edges, adjacency matrix, or soon, whichever you feel most comfortable with.● Include comments in your Java file to explain how nodes and edges are represented.● Assume that only one edge can exist between two nodes.● Assume that it is possible to have an edge connecting a node to itself, ie that a nodecan be connected to itself via an edge.● Because edges are undirected, an edge between v and w is also one between w and v.● Your constructor method should take one parameter: the number of nodes of thegraph. Add a method to your class: boolean addEdge that takes two parameters, v andw (representing two modes v and w which are connected together by the edgebeing added). If successful, the method should return true. The method should return false when it isunsuccessful, which is in the following cases: the edge is already in the…
The primary focus of this assignment is the use of interfaces. In programming, an interface is a public avenue by which data can be accessed and/or manipulated. five Java classes called Point, Circle, Square, Rectangle, and TestAll, as well as a Java interface called FigureGeometry. The TestAll class should implement the main method which tests all of the other files Point.java Description: Instance Variables: private int width;//stores the width of a Point object private private int height;//stores the height of a Point object Constructor: Point() Parameters: int theWidth, int theHeight Purpose: initializes the width and height of a Point object in the following manner: width = theWidth; height = theHeight; Methods: public int getWidth(){//returns the width of a Point object in the following manner return width;} public int getHeight(){//returns the height of a Point object in the following manner: return height;} public void setWidth(int theWidth){//assigns the width of a Point…
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Java provides one interface to sort objects of user defined types. What is the name of this interface type. Use an example to describe how to implement this interface.
Design a Java interface called Priority that includes two methods: setPriority and getPriority. This interface would define a way to establish numeric priority among a set of objects. Your numeric priority values should be on a scale. For easy comparing of priorities, make 1 the lowest priority. It should be more complex than just 1, 2, 3 (low, medium, high). Define constants in the interface for the low, medium, and high priority values. Design and implement a class called Task that represents a task (e.g., something on a to-do list) that implements the Priority interface from above, as well as the Comparable interface from the Java standard class library. A task should have some sort of description. Illustrate your design with a UML class diagram. Create a driver whose main method exercises some Task objects. Make sure you have enough tasks to produce comparisons where a given task is higher, lower, or equal in priority to some other task. Implement the interface such that the tasks…
Write a java program that has:A class University that has:- Three private instance variables named firstName, lastName, and id- A constructor to initialize the three instance variables- A toString method to return: “Welcome,” + firstName +” “ + lastName + “Your ID is ” + id- AccessorsA subclass Employee that has:- Five additional private instance variables named department, rate, bonus, hours, and salary- An appropriate constructor to use constructor of superclass in defining those of the subclass- A method named compteSalary ( ) to return salary- A method named computeBonus ( ) to return bonus- Accessors A subclass Staff that:- Overrides computeBonus ( ) such that if hours are greater than 40, there will be %10 bonus for each additional houradded to salary- Overrides compteSalary ( ) such that salary = (rate * hours) + bonus- Overrides toString method to add department and salary into the outputA subclass Faculty that:- Overrides computeBonus ( ) such that if hours are greater than…
In Java, a class can only inherit from one other ------- . A class can, however, extend many ----------.
JAVA:
MAKE A JAVA PROGRAM A class hierarchy or inheritance tree in computer science is a classification of object types, denoting objects as the instantiations of classes inter-relating the various classes by relationships such as "inherits", "extends", "is an abstraction of", "an interface definition". Write a java program with a class hierarchy using the following classes: Vehicle Car Racecar In the Vehicle class, create the fields called currentLitersOfGasInTank, kilometersPerLiter, and totalKilometersTravelled , all of type double. In the Car class, create the methods consumeGas(), and moveUntilNoMoreGas(), both having a return type of void. ConsumeGas() - this method decrements the currentLitersOfGasInTank field by 1 every time it is called. moveUntilNoMoreGas) - this method calls consumeGas) and then increments totalKilometersTravelled by whatever the value of kilometersPerLiter is. When currentLitersOfGasInTank is 0, it will print "Out of gas". In the Racecar class, create a string…