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2022-02-15 01:14:58 -05:00
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2020-01-15 23:07:02 -05:00
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<h1>October 18th</h1>
<h2>ArrayLists in classes</h2>
<pre><code class="language-java">public class Numbers {
private ArrayList&lt;Integer&gt; used;
private ArrayList&lt;Integer&gt; unused;
numbers () {
// Debug: System.out.println("1. Constructor Entry Point");
used = new ArrayList&lt;Integer&gt;();
unused = new ArrayList&lt;Integer&gt;();
// Debug: System.out.println("2, Constructor Size of ArrayLists" + used.size() + " " + unused.size())
}
// Adds the numbers 1-5 into the used ArrayList
public void fillUsedArrayList() {
for (int i = 0; i &lt; 5; i++) {
used.add(i + 1);
}
}
// Move an item from the unused ArrayList to the used ArrayList
public int moveIt(int index) {
int temp = used.get(index);
unused.add(temp);
// Debug: System.out.println("Adding to used array:" + (i + 1));
used.remove(index);
return temp;
}
// The method below is created for debugging purposes
public void printBothArrayLists() {
// Print the used arraylist
System.out.println("Used ArrayList");
for (int i = 0; i &lt; used.size(); i++) {
System.out.println(used.get(i));
}
// Print the unused arraylist
System.out.println("Unused ArrayList");
for (int i = 0; i &lt; unused.size(); i ++) {
System.out.println(unused.get(i));
}
}
}</code></pre>
<p>Recall that you can compile the code above but you cannot run it. To run code, you must have a main method.</p>
<h2>NumberTester</h2>
<pre><code class="language-java">public class NumberTester {
public static void main(String[] args) {
Numbers list;
list = new Numbers();
list.fillUsedArrayList();
list.printBothArrayLists();
}
}</code></pre>
<h2>Difference between Array and ArrayList</h2>
<p>An Array is a <strong>static</strong> structure of contiguous memory of a single type.</p>
<p>An ArrayList is a <strong>dynamic</strong> structure of contiguous memory of a single type </p>
<p>To get the size of an array you use <code>.length</code></p>
<p>To get the size of an ArrayList you use <code>.size()</code></p>
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