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66 lines
1.2 KiB
Markdown
66 lines
1.2 KiB
Markdown
# Lecture for February 1st
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## Control Structures
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In this class we will talk about three types of control structures
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- Sequential
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- Selection
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- Repetition
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Sequential is what is most familiar to us. Write the lines from top to bottom and it executes it in that order
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### Selection
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Selection depends on the question of `if`.
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If it is raining, wear boots
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```java
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if (raining) {
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wearingBoots = true;
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}
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```
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If you want something to happen also when it is not true, consider an `if-else` statement
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If the light is off, turn it on.
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Otherwise, turn it on
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```java
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if (lightIsOn) {
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lightIsOn = false;
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} else {
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lightIsOn = true;
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}
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```
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Sometimes you can have multiple branches depending on a condition. Let us take a stop light as an example
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```java
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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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}
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```
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## String comparison
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There is a specific method in the `String` class when it comes to checking for string equality
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```java
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boolean equals(String s)
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```
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Let us look at an example
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```java
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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
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```
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