Chapter 7: Arrays and Array Lists

Today's Office Hours

I will have office hours today from 2:10 p.m. - 3:00 p.m. instead of from 10:15 a.m. - 11:00 a.m. Thanks.

Enhanced for Loop

double [] data = ... ;

for (double element: data)
{
  // process element
}

Common Algorithms

• Count the number of times something occurs.
• Determine if something is present.
• Find the maximum (or minimum).

2-D Arrays

• Declaration, e.g. char tictactoe [] [];
• Allocation, e.g. tictactoe = new char [3][3];
• Access, e.g. tictactoe[2][0];
• Assignment, e.g. tictactow[2][0] = 'x';
• Row Determination, e.g. tictactoe.length;
• Column Determination, e.g. tictactoe[0].length;

Lecture Code

This code adds functionality to the CardDeck and Card classes that we began writing on Wednesday.

• CardDeck.java
• Card.java

This code introduces the ArrayList class.

• ArrayListDemo.java