What is wrong in the following code?
public class Test {
public static void main(String[] args) {
Person[] persons = {new Person(3), new Person(4), new Person(1)};
java.util.Arrays.sort(persons);
}
}
class Person {
private int id;
Person(int id) {
this.id = id;
}
}
Want to see the full answer?
Check out a sample textbook solutionChapter 13 Solutions
Introduction to Java Programming and Data Structures, Comprehensive Version (11th Edition)
Additional Engineering Textbook Solutions
Starting Out with C++: Early Objects (9th Edition)
Introduction To Programming Using Visual Basic (11th Edition)
Introduction to Programming Using Visual Basic (10th Edition)
Web Development and Design Foundations with HTML5 (9th Edition) (What's New in Computer Science)
Computer Systems: A Programmer's Perspective (3rd Edition)
Starting Out with Java: From Control Structures through Objects (7th Edition) (What's New in Computer Science)
- Question 37 public static void main(String[] args) { Dog[] dogs = { new Dog(), new Dog()}; for(int i = 0; i >>"+decision()); } class Counter { private static int count; public static void inc() { count++;} public static int getCount() {return count;} } class Dog extends Counter{ public Dog(){} public void wo(){inc();} } class Cat extends Counter{ public Cat(){} public void me(){inc();} } The Correct answer: Nothing is output O 2 woofs and 5 mews O 2 woofs and 3 mews O 5 woofs and 5 mews Oarrow_forwardthe code: class HighArray { private long[] a; private int nElems; public HighArray(int max) { a = new long[max]; nElems = 0; } public void insert(long value) { a[nElems] = value; nElems++; } public boolean find(long searchKey) { int j; for (j = 0; j < nElems; j++) if (a[j] == searchKey) break; if (j == nElems) return false; else return true; } public long getMax() { if (nElems == 0) return 01; else { long max = a[0]; for (int i = 1; i < nElems; i++) { if (a[i] > max) max = a[i]; } return max; } } public boolean delete(long value) { int j; for (j = 0; j < nElems; j++) if (value == a[j]) break; if (j == nElems) return false; else { for (int k = j; k < nElems; k++) a[k] = a[k + 1]; nElems--; return true; } } public void display() { for (int j = 0; j < nElems; j++) System.out.print(a[j] + " "); System.out.println(""); }} public class HighArrayApp { public static void main(String[] args) { int maxSize =…arrow_forwardclass overload { int x; double y; void add(int a , int b) { x = a + b; } void add(double c , double d) { y = c + d; } overload() { this.x 0; %3D this.y = 0; } %3D } class Overload_methods { public static void main(String args[]) { overload obj int a = 2; double b - 3.2; obj.add(a, a); obj.add(b, b); System.out.println(obj.x + } = new overload(); + obj.y); } #3Run the codearrow_forward
- Trace through the following program and show the output. Show your work for partial credit. public class Employee { private static int empID = 1111l; private String name , position; double salary; public Employee(String name) { empID ++; this.name 3 пате; } public Employee(Employee obj) { empID = obj.empĪD; пате %3D оbj.naте; position = obj.position; %3D public void empPosition(String empPosition) {position = empPosition;} public void empSalary(double empSalary) { salary = empSalary;} public String toString() { return name + " "+empID + " "+ position +" $"+salary; public void setName(String empName){ name = empName;} public static void main(String args[]) { Employee empOne = new Employee("James Smith"), empTwo; %3D empOne.empPosition("Senior Software Engineer"); етрOпе.етpSalary(1000); System.out.println(empOne); еmpTwo empTwo.empPosition("CEO"); System.out.println(empOne); System.out.println(empTwo); %3D етpОпе empOne ;arrow_forwardpublic class Course{String name;String dept;int number;public Course (String n, String d, int n){name = n;dept = d;number = n;}public String toString(){return "Course " + name + " in " + dept + " #: " + number;}public static void main (String [] args){Scanner in = new Scanner(System.in);add 10 lines using the scanner and saving them as strings The input for each line will be entered a String, a space, another String, and an int. Parse the input string into those three items and make an instance of Course. Add the new Course instance to a generic ArrayList of Course. print out each Course in the ArrayList.arrow_forwardpublic class Polygon { private double sideLength; private int sides; private String shape; public double getArea () { int n sides; double a sideLength; return ((a * a * n) / (4 * Math.tan((180 / n) 3.14159 / 180))); public void setPolygon (double sl, int sd, String sh) { sides-sd; sideLength-sl; shape=sh; public Polygon (double sl, int sd, String sh) ( sides-sd; sideLengthsl; shape=sh; public String getShape () { return (shape); } public int getSides () { return (sides); } public double getLength () { return (sideLength); } Write a static method named find that takes as a parameter an array of type Polygon named list. The method should print the shapes of each polygon that has an area greater than 500 and return their count. The method prototype is public static int find (Polygon [] list); Note: assume the array is already declared, populated with data in the main method and ready to be used.arrow_forward
- Analyze the following code. 1. public class Test { 2. public static void main(String[] args) { 3. Fruit[] fruits = {new Fruit(2), new Fruit(3), new Fruit(1)}; 4. java.util.Arrays.sort(fruits); 5. } 6.} class Fruit { private double weight; public Fruit(double weight) { this.weight = weight; } } The program has a compile error because the Fruit class does not have a no-arg constructor. The program has a runtime error on Line 3 because the Fruit class does not have a no-arg constructor. The program has a compile error on Line 4 because the Fruit class does not implement the java.lang.Comparable interface and the Fruit objects are not comparable. The program has a runtime error on Line 4 because the Fruit class does not implement the java.lang.Comparable interface and the Fruit objects are not comparable.arrow_forwardclass Param3 { public int x; private void increase(int p) { x = x*p; } public void calculateX(int y) { increase(y); } public int getX() { return x; } } // in another class Param3 q3 = new Param3(); q3.x = 5; q3.calculateX(7); System.out.println(q3.getX()); what would be the answer for the last two lines ? also above were x = x*p do both x in here are the fields? wouldn't that be cnofusing?arrow_forwardpublic static void main(String[] args) { int a; int b; int c; c = quad(0,1, 2); b = quad(1, 2, 3); a = quad(5, 6, 7); c = c +b+ a; } private static int quad(int a, int b, int c) { int r; r= a +b+ c; return r; } For the code above, how many entries does the activation record for method quad have? During the execution of main, at most how many activation records are existent on the run-time stack?arrow_forward
- 1- public class Con{ public static void main(String[] args) int[] ar=(2,5,7,9}; int i=2; final int j=1; 6. for (int x:ar) 8- { 9 if(ar[i]arrow_forwardusing System; class Program { publicstaticvoid Main(string[] args) { int number = 1,i; while (number <= 88) { Console.WriteLine(number); number = number + 2; { Random r = new Random(); int[] randNo=newint[3]; for(i=0;i<3;i++) { randNo[i]= r.Next(1,88) Console.WriteLine("Random Number between 1 and 88 is "+randNo); } } } } } how can this program be fixed to choose three random numbers in C# between 1-88 instead of just one random number?arrow_forward26. Assume the declaration of Exercise 24. A. Write the statements that derive the class dummyClass from class base as a private inheritance. (2 lines are { and }.) "A1 is { "A2 is "A3 is )) B. Determine which members of class base are private, protected, and public in class dummyClass. "B1 is dummyClass is a dearrow_forwardarrow_back_iosSEE MORE QUESTIONSarrow_forward_ios
- Database System ConceptsComputer ScienceISBN:9780078022159Author:Abraham Silberschatz Professor, Henry F. Korth, S. SudarshanPublisher:McGraw-Hill EducationStarting Out with Python (4th Edition)Computer ScienceISBN:9780134444321Author:Tony GaddisPublisher:PEARSONDigital Fundamentals (11th Edition)Computer ScienceISBN:9780132737968Author:Thomas L. FloydPublisher:PEARSON
- C How to Program (8th Edition)Computer ScienceISBN:9780133976892Author:Paul J. Deitel, Harvey DeitelPublisher:PEARSONDatabase Systems: Design, Implementation, & Manag...Computer ScienceISBN:9781337627900Author:Carlos Coronel, Steven MorrisPublisher:Cengage LearningProgrammable Logic ControllersComputer ScienceISBN:9780073373843Author:Frank D. PetruzellaPublisher:McGraw-Hill Education