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You want to enumerate all of the keys in a map named myMap whose keys are type String. Which of the following statements will allow you to do this?

The largestPosition method below returns the index of the largest element in the tail range of an array of integers.  Select the expression that would be needed to complete the selectionSort method below, so that it sorts the elements in descending order. /** Finds the largest element in the tail range of an array. @param a the array to be searched @param from the first position in a to compare @return the position of the largest element in range a[from]..a[a.length – 1] */ private static int largestPosition(int[] a, int from) { int maxPos = from; for(int j = from + 1; j < a.length; j++) { if (a[j] > a[maxPos]) { maxPos = j; } } return maxPos; } public static void selectionSort(int[] a) { for____________________________________ { int maxPos = largestPosition(a, i); ArrayUtil.swap(a, maxPos, i); } }

Which of the following statements about inheritance is correct?

Consider the classes shown below: public class Parent { public void doSomething() // method 1 { /* Implementation not shown */ } } public class Child extends Parent { public void doSomething(int n) // method 2 { /* Implementation not shown */ } public void doSomething() // method 3 { /* Implementation not shown */ } } If the variable kid is defined below, which version of the doSomething method can be called on the variable kid? Child kid = new Child();

Which of the following statements about events and graphical user interface programs is true?

Insert the missing code in the following code fragment. This fragment is intended to read characters from a text file. Scanner in = new Scanner(. . .); in.useDelimiter(“”); while (in.hasNext()) { char ch = ____________; System.out.println(ch); }

Consider the classes shown below: public class Parent { public void doSomething() // method 1 { /* Implementation not shown */ } } public class Child extends Parent { public void doSomething(int n) // method 2 { /* Implementation not shown */ } public void doSomething() // method 3 { /* Implementation not shown */ } } If the variable kid is defined below, which version of the doSomething method can be called on the variable kid? Child kid = new Child();

Consider the following code snippet: class MouseClickedListener implements ActionListener { public void mouseClicked(MouseEvent event) { int x = event.getX(); int y = event.getY(); component.moveTo(x,y); } } What is wrong with this code?

Consider the following inheritance hierarchy diagram: Which of the following statements is correct?

A list is a collection that ____.