public int compareTo(Planet o) {

//Perform lexicographic comparison ignoring cases

//Returns -1 if this.name

//Returns 0 if this.name = o.name

//Returns 1 if this.name > o.name

return (this.name.compareToIgnoreCase(o.name));

}

java program / NetBeans IDE

Exercise 1 Part a: A planet has a name, an orbit, a diameter and a mass. Define a class called Planet, and provide required constructors, toString accessor and mutator methods. The planet class must also implement Comparable interface such that comparedTo method is implemented in the following way