public static int howManyFit(Container largeContainer, Container smallContainer) {...}

Week 6: Methods of OO Programming/10B. How Many Can Fit in a Container?

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+The program has defined an interface class 'Container' and its implementing classes 'Barrel' and 'Bottle'.
+
+Write a method:
+public static int howManyFit(Container largeContainer, Container smallContainer)
+which returns as an integer the information about how many small containerfuls completely fit into the large container.
+
+
+
+Example of calling the method:
+public static void main(String[] args) {
+    Barrel barrel = new Barrel("oak", 5.0);
+    Bottle bottle = new Bottle("orange", 1.5);
+    
+    System.out.println(howManyFit(barrel, bottle));
+}
+
+
+The program prints:
+3
+
+
+
+====================
+
+
+import java.util.Random;
+
+public class Test {
+    public static void main(String[] args) {
+        final Random r = new Random();
+        
+        String[] materials = "oak alder birch plastic steel copper iron rubber".split(" ");
+        double[] volumes = {2.0, 3.0, 4.5, 5.0, 6.0, 7.0, 8.0, 10.0, 20.0, 25.0, 30.0};
+        double[] volumes2 = {0.1, 0.25, 0.5, 0.75, 1.0, 2.0};
+
+        for (int test = 1; test <= 3; test++) {
+            System.out.println("Test " + test);
+
+            String largeMat = materials[r.nextInt(materials.length)];
+            String smallMat = materials[r.nextInt(materials.length)];
+
+            Container large = new Barrel(largeMat, volumes[r.nextInt(volumes.length)] + volumes[r.nextInt(volumes.length)]);
+            Container small = new Bottle(smallMat, volumes2[r.nextInt(volumes2.length)]);
+
+            System.out.println("Large container: " + large);
+            System.out.println("Small container: " + small);
+
+            System.out.println("The large container can hold " + howManyFit(large, small) + " small containerfuls.");
+        }
+    }
+
+
+
+    //ADD
+    public static int howManyFit(Container largeContainer, Container smallContainer) {
+        // https://www.geeksforgeeks.org/java/convert-double-to-integer-in-java/
+        // calculate fraction and return it as an int
+        return (int) (largeContainer.getVolume() / smallContainer.getVolume());
+    }
+
+
+
+
+
+
+
+
+
+
+
+
+}
+
+
+
+
+
+
+
+interface Container {
+    double getVolume();
+}
+
+
+
+
+class Bottle implements Container {
+    private String name;
+    private double volume;
+
+    public Bottle(String name, double volume) {
+        this.name = name;
+        this.volume = volume;
+    }
+
+    @Override
+    public double getVolume() {
+        // TODO Auto-generated method stub
+        return volume;
+    }
+
+    @Override
+    public String toString() {
+        return name + " bottle, volume " + volume + " liters";
+    }
+}
+
+
+
+
+
+class Barrel implements Container {
+    private String name;
+    private double volume;
+
+    public Barrel(String name, double volume) {
+        this.name = name;
+        this.volume = volume;
+    }
+
+    @Override
+    public double getVolume() {
+        // TODO Auto-generated method stub
+        return volume;
+    }
+
+    @Override
+    public String toString() {
+        return name + " barrel, volume " + volume + " liters";
+    }
+}
+
+
+
+
+
+
+Test 1
+Large container: copper barrel, volume 40.0 liters
+Small container: plastic bottle, volume 0.25 liters
+The large container can hold 160 small containerfuls.
+
+Test 2
+Large container: plastic barrel, volume 22.0 liters
+Small container: rubber bottle, volume 0.1 liters
+The large container can hold 220 small containerfuls.
+
+Test 3
+Large container: steel barrel, volume 33.0 liters
+Small container: alder bottle, volume 0.5 liters
+The large container can hold 66 small containerfuls.
+
+
+
+