ARRAYS - Java Programming: From Problem Analysis to Program Design - page 633

35. Suppose that you have the following declarations:
int [][] times = new int [30][7];
int [][] speed = new int [15][7];
int [][] trees = new int [100][7];
int [][] students = new int [50][7];
a. Write the definition of the method print that can be used to output
the contents of these arrays.
b. Write the Java statements that call the method print to output the
contents of the arrays times , speed , trees , and students .
36. What is the effect of the following statement?
Vector<Double> list = new Vector<Double>();
37. Suppose that you have the following Vector object list :
list = ["One", "Two", "Three", "Four"];
What are the elements of list after the following statements execute?
list.addElement("Five");
list.insertElementAt("Six", 1);
38. Suppose that you have the following Vector object names :
names = ["Gwen", "Donald", "Michael", "Peter", "Susan"];
What are the elements of names after the following statements execute?
names.removeElementAt(1);
names.removeElement("Peter");
39. What is the output of the following program?
import java.util.Vector;

9

public class Exercise39
{

public static void main(String[] arg)
{

Vector<String> strList = new Vector<String>();
Vector<Integer> intList = new Vector<Integer>();

strList.addElement("Hello");
intList.addElement(10);
strList.addElement("Happy");
intList.addElement(20);
strList.addElement("Sunny");
intList.addElement(30);

System.out.println("strList: " + strList);
System.out.println("intList: " + intList);

strList.insertElementAt("Joy", 2);

intList.removeElement(20);