2020-01-15 23:07:02 -05:00
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2022-02-15 01:14:58 -05:00
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<meta name="author" content="Brandon Rozek">
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2020-01-15 23:07:02 -05:00
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<h1>Lecture for February 1st</h1>
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<h2>Control Structures</h2>
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<p>In this class we will talk about three types of control structures</p>
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<ul>
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<li>Sequential</li>
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<li>Selection</li>
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<li>Repetition</li>
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</ul>
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<p>Sequential is what is most familiar to us. Write the lines from top to bottom and it executes it in that order</p>
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<h3>Selection</h3>
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<p>Selection depends on the question of <code>if</code>. </p>
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<p>If it is raining, wear boots</p>
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<pre><code class="language-java">if (raining) {
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wearingBoots = true;
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}</code></pre>
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<p>If you want something to happen also when it is not true, consider an <code>if-else</code> statement</p>
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<p>If the light is off, turn it on.</p>
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<p>Otherwise, turn it on</p>
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<pre><code class="language-java">if (lightIsOn) {
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lightIsOn = false;
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} else {
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lightIsOn = true;
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}</code></pre>
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<p>Sometimes you can have multiple branches depending on a condition. Let us take a stop light as an example</p>
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<pre><code class="language-java">if (light == "red") {
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car.stop()
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} else if (light == "yellow") {
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car.slow()
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} else {
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car.go()
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}</code></pre>
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<h2>String comparison</h2>
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<p>There is a specific method in the <code>String</code> class when it comes to checking for string equality</p>
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<pre><code class="language-java">boolean equals(String s)</code></pre>
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<p>Let us look at an example</p>
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<pre><code class="language-java">String word = "hello";
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boolean ans = word.equals("hello"); // Returns true
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boolean ans2 = word.equals("Hello"); // Returns false</code></pre>
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