add cat and housecat classes, patch student class so build error doesnt distract

Author: CarlyLanglois

src/org/launchcode/java/demos/inheritance/Cat.java

@@ -0,0 +1,72 @@
+package org.launchcode.java.demos.inheritance;
+
+public abstract class Cat {
+
+    private boolean tired = false;
+    private boolean hungry = false;
+    private double weight;
+
+    // The biological family for all cat species
+    private String family = "Felidae";
+
+    public Cat (double aWeight) {
+        weight = aWeight;
+    }
+
+    public Cat () {
+        weight = 13;
+    }
+
+    /**** Getters and Setters ****/
+
+    public boolean isTired() {
+        return tired;
+    }
+
+    public void setTired(boolean aTired) {
+        tired = aTired;
+    }
+
+    public boolean isHungry() {
+        return hungry;
+    }
+
+    public void setHungry(boolean aHungry) {
+        hungry = aHungry;
+    }
+
+    public double getWeight() {
+        return weight;
+    }
+
+    public void setWeight(double aWeight) {
+        weight = aWeight;
+    }
+
+    public String getFamily() {
+        return family;
+    }
+
+    /**** Instance Methods ****/
+
+    // A cat is rested and hungry after it sleeps
+    public void sleep() {
+        tired = false;
+        hungry = true;
+    }
+
+    // Eating makes a cat not hungry
+    public void eat() {
+
+        // eating when not hungry makes a cat sleepy
+        if (!hungry) {
+            tired = true;
+        }
+
+        hungry = false;
+    }
+
+    public String noise () {
+        return "Meeeeeeooooowww!";
+    }
+}

src/org/launchcode/java/demos/inheritance/HouseCat.java

@@ -0,0 +1,41 @@
+package org.launchcode.java.demos.inheritance;
+
+public class HouseCat extends Cat {
+    private String name;
+    private String species = "Felis catus";
+
+    public HouseCat(String aName, double aWeight) {
+        super(aWeight);
+        name = aName;
+    }
+
+    public HouseCat(String aName) {
+        name = aName;
+    }
+
+    public HouseCat(double aWeight) {
+        super(aWeight);
+    }
+
+    public boolean isSatisfied() {
+        return !isHungry() && !isTired();
+    }
+
+//    @Override
+//    public String noise() {
+//        return "Hello, my name is " + name + "!";
+//    }
+
+    @Override
+    public String noise() {
+        if (isSatisfied()) {
+            return "Hello, my name is " + name + "!";
+        } else {
+            return super.noise(); // prints "Meeeeeeooooowww!"
+        }
+    }
+
+    public String purr() {
+        return "I'm a HouseCat";
+    }
+}

src/org/launchcode/java/demos/lsn4school/Student.java

@@ -31,6 +31,8 @@ public String studentInfo() {
     // TODO: Complete the getGradeLevel method here:
     public String getGradeLevel() {
         // Determine the grade level of the student based on numberOfCredits
+        // replace this return statement
+        return "";
     }
 
     // TODO: Complete the addGrade method.