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Answer 12

Question 13

Give a brief description of the concept of a string and list the names of two classes used to implement strings?

Answer 13

Question 14

What is the syntax that is used to create a literal string? Provide a code fragment to illustrate your answer.

Answer 14

Question 15

Explain the difference between objects of types String and StringBuffer .

Answer 15

Question 16

Provide a code fragment that illustrates how to concatenate strings.

Answer 16

Question 17

Provide a code fragment that declares and instantiates an array object capable of storing references to two String objects. Explain what happens when this code fragment is executed. Then show a code fragment that will allocate memory forthe actual String objects.

Answer 17

Question 18

Write a Java application that illustrates the creation and manipulationof a two-dimensional array with the sub arrays being of different lengths.Also cause your application to illustrate that an attempt to access an array element out of bounds results in anexception being thrown. Catch and process the exception. Display a termination message with your name.

Answer 18

Listings

What is the meaning of the following two images?

This image was inserted here simply to insert some space between the questions and the answers to keep them from being visible on the screen at thesame time.

The image is also an example of the kinds of things that we do in my course titled ITSE 2321, Object-Oriented Programming.

Missing image

This image was also inserted for the purpose of inserting space between the questions and the answers.

Missing image

Answers

Answer 18

Listing 1 . Listing for Answer 18.
class SampProg10 { //define the controlling class public static void main(String[]args){ //define main //Declare a two-dimensional array with a size of 3 on// the primary dimension but with different sizes on // the secondary dimension.//Secondary size not specified int[][] myArray = new int[3][];myArray[0] = new int[2];//secondary size is 2 myArray[1]= new int[3];//secondary size is 3myArray[2] = new int[4];//secondary size is 4 //Fill the array with datafor(int i = 0; i<3; i++){ for(int j = 0; j<myArray[i].length; j++){myArray[i][j]= i * j; }//end inner loop}//end outer loop //Display data in the arrayfor(int i = 0; i<3; i++){ for(int j = 0; j<myArray[i].length; j++){System.out.print(myArray[i][j]); }//end inner loopSystem.out.println(); }//end outer loop//Attempt to access an out-of-bounds array element try{System.out.println( "Attempt to access array out of bounds");myArray[4][0]= 7; }catch(ArrayIndexOutOfBoundsException e){System.out.println(e); }//end catchSystem.out.println("Terminating, Dick Baldwin");}//end main }//End SampProg10 class. Note no semicolon required

Back to Question 18

Answer 17

The following statement declares and instantiates an array object capable of storing references to two String objects.

String[] myArrayOfStringReferences = new String[2];

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Source:  OpenStax, Object-oriented programming (oop) with java. OpenStax CNX. Jun 29, 2016 Download for free at https://legacy.cnx.org/content/col11441/1.201
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