Chapter 18, Problem 16PE

Program Plan Intro

Appending elements of array lists

Program plan:

Filename: “ArrayListUtil.java”

This code snippet creates a class “ArrayListUtil”. In the code,

• Import the required packages.
• Define a class “ArrayListUtil”.
  • Declare a method “append()” to append elements of array lists “a” and “b”.
    • Iterate a “for” loop to get element of “b”.
      • Add “o” to “a”.

Filename: “Person.java”

This code snippet creates a class “Person”. In the code,

• Import the required packages.
• Define a class “Person”.
  • Declare a class member “name”.
  • Define a constructor “Person()”.
    • Set the value of “name”.
  • Define a method “toString()”.
    • Return the value of “name” as a string.

Filename: “Student.java”

This code snippet creates a class “Student”. In the code,

• Import the required packages.
• Define a class “Student” by extending class “Person”.
  • Declare a class member “major”.
  • Define a constructor “Student()”.
    • Set the value of “name” of class “Person”.
    • Set the value of “major”.
  • Define a method “toString()”.
    • Return the value of “major” as a string.

Filename: “AppendTester.java”

This code snippet creates a class “AppendTester”. In the code,

• Import the required packages.
• Define a class “AppendTester”.
  • Define the “main” method.
    • Create an array list “a”.
    • Create an array list “b”.
    • Add elements of class “Person” to “a” using “add()”.
    • Add elements of class “Student” to “b” using “add()”.
    • Call the method “append()” of “ArrayListUtil” to append “a” and “b”.
    • Print the elements of “a”.
    • Print the expected values.