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MorePractice/Class_basic/Box.java

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+package class_basic;
+
+public class Box {
+    private double width, height, depth;
+
+    public Box(){
+        width = 5;
+        height = 10;
+        depth = 2;
+    }
+    public Box(double len){
+        width = height = depth = len;
+    }
+
+    public Box(double width, double height, double depth){
+        this.width = width;
+        this.height = height;
+        this.depth = depth;
+    }
+
+    public Box(Box box){
+        width = box.width;
+        depth = box.depth;
+        height = box.height;
+    }
+
+
+    public double getWidth() {
+        return width;
+    }
+
+    public void setWidth(double width) {
+        this.width = width;
+    }
+
+    public double getHeight() {
+        return height;
+    }
+
+    public void setHeight(double height) {
+        this.height = height;
+    }
+
+    public double getDepth() {
+        return depth;
+    }
+
+    public void setDepth(double depth) {
+        this.depth = depth;
+    }
+
+    public void setDim(double width, double height, double depth){
+        this.width = width;
+        this.height = height;
+        this.depth = depth;
+    }
+
+    public boolean equalTo(Box o){
+        return (o.width==width && o.height==height && o.depth==depth);
+    }
+
+    public double volume(){
+        return height*width*depth;
+    }
+
+    @Override
+    public String toString() {
+        return "Box[width=" + width + ",height=" + height + ",depth=" + depth + "]";
+    }
+}

MorePractice/Class_basic/Rectangle.java

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+package class_basic;
+
+public class Rectangle {
+    private int width, length;
+
+    // constructor - special method, named as "ClassName" and no return type
+    public Rectangle(int width, int length){
+        this.width = width;
+        this.length = length;
+    }
+
+    public double getArea(){
+        return width*length;
+    }
+}

MorePractice/Class_basic/box_test.java

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+package class_basic;
+
+public class box_test {
+    public static void main(String[] args) {
+        Box box1 = new Box();
+// Test constructors and toString()
+        System.out.println(box1.toString()); // Explicitly calling toString()
+        System.out.println(box1); // Implicit call to
+        System.out.println(box1.volume());
+    }
+}

MorePractice/Class_basic/test_rectangle.java

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+package class_basic;
+
+public class test_rectangle {
+    public static void main(String[] args) {
+        Rectangle rectangle_1 = new Rectangle(5, 10);
+        Rectangle rectangle_2 = new Rectangle(6, 12);
+
+        System.out.println("Area of the rectangle = " + rectangle_1.getArea());
+        System.out.println("Area of the rectangle 2 = " + rectangle_2.getArea());
+    }
+
+}