Write a java program to demonstrate constructor overloading, method overloading and method overriding. Make necessary assumptions. 

Sure! Here’s a Java program demonstrating constructor overloading, method overloading, and method overriding. We’ll use a simple example involving a base class `Shape` and two derived classes `Circle` and `Rectangle`. Each class will illustrate these concepts.

```java
// Base class
class Shape {
    private String color;
    private int sides;

    // Constructor overloading
    public Shape() {
        this.color = "Unknown";
        this.sides = 0;
    }

    public Shape(String color) {
        this.color = color;
        this.sides = 0;
    }

    public Shape(String color, int sides) {
        this.color = color;
        this.sides = sides;
    }

    // Method overloading
    public void displayInfo() {
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