Rectangle class by @malvitvik

.gitignore

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+.idea/
+*.iml
+stale_outputs_checked

src/pointer/rectangle/Main.java

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+package pointer.rectangle;
+
+public class Main {
+
+    public static void main(String[] args) {
+        Rectangle rectangle1 = new Rectangle(10,6);
+        Rectangle rectangle2 = new Rectangle(4);
+
+        print(rectangle1);
+        print(rectangle2);
+    }
+
+    public static void print(Rectangle rectangle) {
+        System.out.println("Площа прямокутника = " + rectangle.square());
+        System.out.println("Периметр прямокутника = " + rectangle.perimeter());
+    }
+}

src/pointer/rectangle/Rectangle.java

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+package pointer.rectangle;
+
+public class Rectangle {
+    private int width;
+    private int length;
+
+    Rectangle(int width, int length) {
+        this.width = width;
+        this.length = length;
+    }
+
+    Rectangle(int a) {
+        this(a, a);
+    }
+
+    public Rectangle() {
+        this(1);
+    }
+
+    int square() {
+        return width*length;
+    }
+
+    int perimeter() {
+        return (width + length) << 1; // or p =*2;
+    }
+}