Which of these method implementations would correctly insert an element into an ArrayList before every even index?

public void addEven(ArrayList array, E element) { for(int index = 1; index < array.size(); index++) { if(index %2 == 0) { array.add(index+ 1, element); index--; } } }

public void addEven(ArrayList array, E element) { for(int index = 0; index < array.size(); index++) { if(index %2 == 0) { array.add(index, element); index++; } } }

public void addEven(ArrayList array, E element) { for(int index = 0; index < array.size(); index++) { if(index %2 == 0) { array.add(index -1, element); index++; } } }

public void addEven(ArrayList array, E element) { for(int index = 0; index < array.size(); index++) { if(index %2 == 0) { array.add(index, element); index++; index++; } } }

2. Which of these methods will properly traverse two ArrayLists and print any index that have the same value in both ArrayLists?

public void printSharedValues(ArrayList array1, ArrayList array2) { int size; if(array1.size() > array2.size()) { size = array2.size(); } else { size = array1.size(); } while(index < size) { int index = 0; if(array1.get(index) == array2.get(index)) { System.out.println(index); } index++; } }

public void printSharedValues(ArrayList array1, ArrayList array2) { int index = 0; while(index < array1.size()) { if(array1.get(index) == array2.get(index)) { System.out.println(index); } index--; } }

public void printSharedValues(ArrayList array1, ArrayList array2) { int index = 0; int size; if(array1.size() > array2.size()) { size = array2.size(); } else { size = array1.size(); } while(index < size) { if(array1.get(index) == array2.get(index)) { System.out.println(index); } index++; } }

public void printSharedValues(ArrayList array1, ArrayList array2) { int index = 0; while(index < array1.size()) { if(array1.get(index) == array2.get(index)) { System.out.println(index); } index++; } }

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The correct implementation to insert an element into an ArrayList before every even index is public ... View the full answer