Author: Anonymous

Consider the following code snippet: public class Vehicle { . . . public void setVehicleClass(double numberAxles) { . . . } } public class Auto extends Vehicle { . . . public void setVehicleClass(int numberAxles) { . . . } } Which of the following statements is correct?

Consider the following code snippet:   public class MyMouseListener { public void mousePressed(MouseEvent event) { double x; double y; _______ System.out.println(“x: ” + x + “, y: ” + y); } } Which of the following statements should be in the indicated position to print out where the mouse was pressed?

The _______ interface toolkit has a large set of user-interface components.

Consider the following code snippet:   public class MyMouseListener { public void mousePressed(MouseEvent event) { double x; double y; _______ System.out.println(“x: ” + x + “, y: ” + y); } } Which of the following statements should be in the indicated position to print out where the mouse was pressed?

Assume you are using a doubly-linked list data structure with many nodes. What is the minimum number of node references that are required to be modified to remove a node from the middle of the list? Consider the neighboring nodes.

Assume you are using a doubly-linked list data structure with many nodes. What is the minimum number of node references that are required to be modified to remove a node from the middle of the list? Consider the neighboring nodes.

Consider the following class hierarchy: public class Vehicle { private String type; public Vehicle(String type) { this.type = type; } public String displayInfo() { return type; } } public class LandVehicle extends Vehicle { public LandVehicle(String type) { super(type); } } public class Auto extends LandVehicle { public Auto(String type) { super(type); } } You have written a program to use these classes, as shown in the following code snippet: public class VehicleTester { public static void main(String[] args) { Auto myAuto = new Auto(“sedan”); System.out.println(“MyAuto type = ” + ______); } } Complete the code in this program snippet to correctly display the auto’s type.

Select an appropriate expression to complete the following method, which is designed to return the number of elements in the parameter array numbers.  If a value appears more than once, it should be counted exactly once. public static int countElementsOnce(int[] numbers) { Set values = new HashSet(); for (int num: numbers) { values.add(num); } ______________________ }

Consider the following class hierarchy: public class Vehicle { private String type; public Vehicle(String type) { this.type = type; } public String displayInfo() { return type; } } public class LandVehicle extends Vehicle { public LandVehicle(String type) { super(type); } } public class Auto extends LandVehicle { public Auto(String type) { super(type); } } You have written a program to use these classes, as shown in the following code snippet: public class VehicleTester { public static void main(String[] args) { Auto myAuto = new Auto(“sedan”); System.out.println(“MyAuto type = ” + ______); } } Complete the code in this program snippet to correctly display the auto’s type.

Suppose the class Value is partially defined below public class Value { private int number; public int getValue() { return number; } } A subclass of Value, LargerValue, is defined with a getValue method that returns twice the value of the parent.  Which line is the body of LargerValue’s getValue method?