Enumarated Types 🎄

Author: viktorvoltz

EnumaratedTypes/EnumClass.java

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+enum Shrubbery {
+    GROUND,
+    CRAWLING,
+    HANGING
+}
+
+public class EnumClass {
+    public static void main(String[] args) {
+        for (Shrubbery s : Shrubbery.values()) {
+            System.out.println(s + " ordinal: " + s.ordinal());
+            System.out.println(s.compareTo(Shrubbery.CRAWLING) + " ");
+            System.out.println(s.equals(Shrubbery.CRAWLING) + " ");
+            System.out.println(s == Shrubbery.CRAWLING);
+            System.out.println(s.getDeclaringClass());
+            System.out.println(s.name());
+            System.out.println("----------------------");
+        }
+        for (String s: "HANGING CRAWLING GROUND".split(" ")){
+            Shrubbery shrub = Enum.valueOf(Shrubbery.class, s);
+            System.out.println(shrub);
+        }
+    }
+}

EnumaratedTypes/OzWitch.java

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+public enum OzWitch { 
+    // Instances must be defined first, before methods: 
+    WEST("Miss Gulch, aka the Wicked Witch of the West"), 
+    NORTH("Glinda, the Good Witch of the North"), 
+    EAST("Wicked Witch of the East, wearer of the Ruby " + 
+    "Slippers, crushed by Dorothy’s house"), 
+    SOUTH("Good by inference, but missing"); 
+    private String description; 
+    // Constructor must be package or private access: 
+    private OzWitch(String description) { 
+    this.description = description; 
+    } 
+    public String getDescription() { return description; } 
+    public static void main(String[] args) { 
+    for(OzWitch witch : OzWitch.values()) 
+    System.out.println(witch + ": " + witch.getDescription()); 
+    } 
+   } 

EnumaratedTypes/viktorvoltz/Exercise1.java

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+package viktorvoltz;
+import static viktorvoltz.Signal.*;
+
+public class Exercise1 {
+
+    Signal color = RED;
+    public void change(){
+        switch(color){
+            case RED: color = GREEN; break;
+            case GREEN: color = YELLOW; break;
+            case YELLOW: color = RED; break;
+        }
+    }
+    @Override
+    public String toString() {
+        return "Traffic Light is: " + color;
+    }
+    public static void main(String[] args) {
+        Exercise1 exercise1 = new Exercise1();
+        for (int i = 0; i < 7; i++){
+            System.out.println(exercise1);
+            exercise1.change();
+        }
+    }
+}

EnumaratedTypes/viktorvoltz/Signal.java

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+package viktorvoltz;
+public enum Signal {
+    GREEN, YELLOW, RED,
+}