COMP2140 Java Programming: Java Basics

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Topic 1: Java Basics – Loops, Text I/O, Methods, and Arrays (15%)

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1. (3%)Write a java program that uses a loop with selections to output the average of the numbers in the range of [5, 100] (with a step size of 5) that are multiples of 10 but not divisible by 3.

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2. (3%)Write a program that will count the number of characters, words, and lines in a file. Words are separated by whitespace characters. The file name should be passed as a command-line argument, as shown in the figure below. Feel free to make your own sensible text file for testing and choose your file name.

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1. (3%)Write the methods with the following headers:

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public static int reverse(int number) // Return the reversal of an integer, e.g., reverse(456) returns 654

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public static boolean isPalindrome(int number) // Return true if number is a palindrome

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Use the reverse method to implement isPalindrome. A number is a palindrome if its reversal is the same as itself. Write a test main program that prompts the user to enter an integer and reports whether the integer is a palindrome.

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1. (3%)Write a program that prompts the user to enter two arrays of integers and displays the common elements that appear in both arrays. Note that the first number in the input indicates the number of the elements in the list. This number is not part of the list.

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Here is a sample run:

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Enter list1: 5 5 2 10 1 6

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Enter list2: 9 2 3 10 3 34 35 67 3 1 

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The common elements are 2 10 1

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1. (3%)The inverse of a square matrix A is denoted A^-1, such that A × A^-1 = I, where I is the identity matrix with all 1s on the diagonal and 0 on all other cells. The inverse of a 2×2 matrix A can be obtained using the following formula:       

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Implement the following method to obtain an inverse of 2×2 matrix:

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public static double[][] inverse(double[][] A)

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The method returns null if ad – bc is 0.

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Write a test program that prompts the user to enter a, b, c, d for a matrix, and displays its inverse matrix.

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Here are three sample runs:

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Enter a, b, c, d: 1 2 3 4

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-2.0 1.0

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1.5 -0.5

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Enter a, b, c, d: 0.5 2 1.5 4.5

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-6.0 2.6666666666666665

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2.0 -0.6666666666666666

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Enter a, b, c, d: 1 2 3 6 

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No inverse matrix

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Topic 2: Java OOP – Objects and Classes (10%)

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1. (5%) Design a class named https://myassignmenthelp.com/au/anu/comp2140-java-programming/’Accounthttps://myassignmenthelp.com/au/anu/comp2140-java-programming/’ that contains:

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• A private int data field named id for the account (default 0).

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• A private double data field named balance for the account (default 0).

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• A private double data field named annualInterestRate that stores the current interest rate (default 0). Assume that all accounts have the same interest rate.

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• A private Date data field named dateCreated that stores the date when the account was created.

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• A no-arg constructor that creates a default account.

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• A constructor that creates an account with the specified id and initial balance.

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• The accessor and mutator methods for id, balance, and annualInterestRate.

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• The accessor method for dateCreated.

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• A method named getMonthlyInterestRate() that returns the monthly interest rate.

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• A method named getMonthlyInterest() that returns the monthly interest.

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• A method named withdraw that withdraws a specified amount from the account.

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• A method named deposit that deposits a specified amount to the account.

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Implement the class as defined above and before that draw a UML class diagram as your OOP design. Note that the method getMonthlyInterest() is to return monthly interest, not the interest rate. Monthly interest is balance * monthlyInterestRate; And monthlyInterestRate is annualInterestRate / 12.

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Then write a test program that creates an Account object with an account ID of 1001, a balance of $20,000, and an annual interest rate of 4.5%. Use the withdraw method to withdraw $2,500 and print the balance. Use the deposit method to deposit $3,000, and print the balance, the monthly interest, and the date when this account was created.

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1. (5%) The Eight Queens problem is to find a solution to place a queen in each row on a chessboard such that no two queens can attack each other. You can use a two-dimensional array to represent a chessboard. However, since each row can have only one queen, it is sufficient to use a one-dimensional array to denote the position of the queen in the row. Thus, you can define the queensarray as:

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int[] queens = new int[8];

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Assign j to queens[i] to denote that a queen is placed in row i and column j.

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Define a class named EQ to represent eight queens in a chess board with the following members:

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1. A private data field queens of the type int[].

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2. A no-arg constructor that constructs an object of EQ default queens values of -1s in the array.

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3. A constructor named EQ(int[] queens) that constructs an object of EQ with the specified queen placement.

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4. A method named get(int i) that returns queens[i].

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5. A method named set(int i, int j) that sets queens[i] with j.

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6. A method named isSolved() that returns true if all queens are placed in the board correctly.

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7. A method named printBoard() that displays the board with the queens like the following:

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|X| | | | | | | |

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| | | | |X| | | |

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| | | | | | | |X|

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| | | | | |X| | |

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| | |X| | | | | |

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| | | | | | |X| |

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| |X| | | | | | |

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| | | |X| | | | |

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Implement the class and use the following program to test your class.

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  public static void main(String[] args) {

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    EQ board1 = new EQ();

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    board1.set(0, 2);

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    board1.set(1, 4);

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    board1.set(2, 7);

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    board1.set(3, 1);

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    board1.set(4, 0);

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    board1.set(5, 3);

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    board1.set(6, 6);

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    board1.set(7, 5);

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    System.out.println(https://myassignmenthelp.com/au/anu/comp2140-java-programming/”Is board 1 a correct eight queen placement? https://myassignmenthelp.com/au/anu/comp2140-java-programming/”

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        + board1.isSolved());

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    EQ board2 = new EQ(new int[] { 0, 4, 7, 5, 2, 6, 1, 3 });

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    if (board2.isSolved()) {

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      System.out.println(https://myassignmenthelp.com/au/anu/comp2140-java-programming/”Eight queens are placed correctly https://myassignmenthelp.com/au/anu/comp2140-java-programming/”

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        + https://myassignmenthelp.com/au/anu/comp2140-java-programming/”in board 2https://myassignmenthelp.com/au/anu/comp2140-java-programming/”);

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      board2.printBoard();

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    }

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    else {

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      System.out.println(https://myassignmenthelp.com/au/anu/comp2140-java-programming/”Eight queens are placed incorrectly https://myassignmenthelp.com/au/anu/comp2140-java-programming/” 

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        + https://myassignmenthelp.com/au/anu/comp2140-java-programming/”in board 2https://myassignmenthelp.com/au/anu/comp2140-java-programming/”);

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    }

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  }

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Topic 3: Java OOP – Inheritance and Polymorphism (5%)

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1. (5%)Following from the Topic 2 problem 6, the Account class was defined to model a bank account. An account has the properties account number, balance, annual interest rate, and date created, and methods to deposit and withdraw funds. Create two subclasses for checking and saving accounts. A checking account has an overdraft limit, but a savings account cannot be overdrawn. Draw the UML diagram for the classes and implement them. Write a sensible test program that creates objects of Account, SavingsAccount, and CheckingAccount, simulate their different transactions and invokes their toString() methods for printing the account status after each transaction.

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