Package dsa

Class Transaction

java.lang.Object
dsa.Transaction
All Implemented Interfaces:
Comparable<Transaction>
public class Transaction extends Object implements Comparable<Transaction>
An immutable data type to represent a commercial transaction with a name, date, and amount.

  • Constructor Details

    • Transaction

      public Transaction(String name, Date date, double amount)
      Constructs a transaction from a name, date, and amount.
      Parameters:
      name - name of the person involved in this transaction.
      date - date of this transaction.
      amount - amount of this transaction.

    • Transaction

      public Transaction(String s)
      Constructs a transaction from a string s of the form "name date amount".
      Parameters:
      s - the string.

  • Method Details

    • name

      public String name()
      Returns the name of the person involved in this transaction.
      Returns:
      the name of the person involved in this transaction.

    • date

      public Date date()
      Returns the date of this transaction.
      Returns:
      the date of this transaction.

    • amount

      public double amount()
      Returns the amount of this transaction.
      Returns:
      the amount of this transaction.

    • hashCode

      public int hashCode()
      Returns a hash code for this transaction.
      Overrides:
      hashCode in class Object
      Returns:
      a hash code for this transaction.

    • toString

      public String toString()
      Returns a string representation of this transaction.
      Overrides:
      toString in class Object
      Returns:
      a string representation of this transaction.

    • compareTo

      public int compareTo(Transaction other)
      Returns a comparison of this transaction with other, by amount.
      Specified by:
      compareTo in interface Comparable<Transaction>
      Parameters:
      other - the other transaction.
      Returns:
      a comparison of this transaction with other, by amount.

    • nameOrder

      public static Comparator<Transaction> nameOrder()
      Returns a comparator for comparing two transactions by name.
      Returns:
      a comparator for comparing two transactions by name.

    • dateOrder

      public static Comparator<Transaction> dateOrder()
      Returns a comparator for comparing two transactions by date.
      Returns:
      a comparator for comparing two transactions by date.

    • main

      public static void main(String[] args)
      Unit tests the data type.
      Parameters:
      args - the command-line arguments.