What is the main goal of using generics in Java?单项选择题

A

To remove the need for classes

B

To simplify variable names

C

To make programs run faster

D

To support many data types safely

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What will be the output of the following program? import java.util.*; public class Q13 {     public static void main(String[] args) {         List<? super Integer> list = new ArrayList<Number>();         list.add(10);         list.add(3.14);         System.out.println(list.size());     } }

What will be the output of the following program? import java.util.List; import java.util.LinkedList; public class Q13 {     public static void main(String[] args) {         List<? extends Number> list = new LinkedList<Integer>();         System.out.println(list.size());     } }

Which statement will compile and create a StudentIDs object given the following code: public class StudentIDs<TheType extends Comparable<TheType>> { private TheType item1; private TheType item2; public StudentIDs(TheType i1, TheType i2) { item1 = i1; item2 = i2; } } 1: StudentIDs<Integer> newStudent = new StudentIDs<Integer>(9, 5); 2: StudentIDs<int> newStudent = new StudentIDs<int>(9, 5); 3: StudentIDs<Integer> newStudent = new StudentIDs<>(9, 5); 4: StudentIDs<int> newStudent = new StudentIDs<int>(9, 5);

Which statement correctly creates an ArrayList of Integers?

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