I have a class that has a custom equals() method. When I compare two objects using this equals method, not only am I interested in whether or not they are equal, but if they are not equal, what was different about them. Finally, I want to be able to retrieve the differences arising from an unequal situation.
I currently use logging to display where my objects are unequal. This works, but I have a new requirement of being able to extract the actual results of the equals check for display later. I suspect there is an object-oriented design pattern for handling this type of situation.
public class MyClass {
int x;
public boolean equals(Object obj) {
// make sure obj is instance of MyClass
MyClass that = (MyClass)obj;
if(this.x != that.x) {
// issue that I would like to store and reference later, after I call equals
System.out.println("this.x = " + this.x);
System.out.println("that.x = " + that.x);
return false;
} else {
// assume equality
return true
}
}
}
Are there any good design pattern suggestions where some sort of work is being done, but a secondary object collects information about how well that work was done which can later be retrieved and displayed?
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