A palindrome is a word or phrase that reads the same forward or backward. Consider the following code snippet: public boolean palindrome(String string) { return isPal(string, 0, string.length() – 1); } private boolean isPal(String string, int left, int right) { if (left >= right) { return true; } else if (string.charAt(left) == string.charAt(right)) { return isPal(string, left + 1, right – 1); } else { return false; } } What is the purpose of the palindrome method?

Consider the following code snippet: Vehicle aVehicle = new Auto(); aVehicle.moveForward(200); If the Auto class inherits from the Vehicle class, and both classes have an implementation of the moveForward method with the same set of parameters and the same return type, which statement is correct?

If the user wants to process keystrokes, which methods of the KeyListener interface must be implemented?

A portion of your program includes the loops shown in the code snippet below to examine the elements of two arrays, arr1 and arr2, both of length n: int matches = 0; for (int i = 0; i < arr1.length; i++) { for (int j = 0; j < arr2.length; j++) { if (arr1[i].equals(arr2[j])) { matches++; } } } What can you conclude about the running time of this section of code?

Suppose a developer gets class XYZ files and documentation from a subcontractor. This class does not implement the Comparable interface. What must be true in order for the developer to sort an array of XYZ objects without modifying the XYZ class?

A portion of your program includes the loops shown in the code snippet below to examine the elements of two arrays, arr1 and arr2, both of length n: int matches = 0; for (int i = 0; i < arr1.length; i++) { for (int j = 0; j < arr2.length; j++) { if (arr1[i].equals(arr2[j])) { matches++; } } } What can you conclude about the running time of this section of code?

The method below implements the exponentiation operation recursively by taking advantage of the fact that, if the exponent n is even, then xn = (x n/2)2. Select the expression that should be used to complete the method so that it computes the result correctly. public static double power(double base, int exponent) { if (exponent % 2 != 0) // if exponent is odd { return base * power(base, exponent – 1); } else if (exponent > 0) { double temp = ________________________ ; return temp * temp; } return base; }

Consider the following code snippet: myImage.add(new Rectangle(10,10,10,10)); This code is an example of using  ____.

In Java, two methods can have the same name provided that what is true?

Which of the following is an event source?