Please read the entire question and the line of the solution is clear. The solution using the Java language

The codes are there, but I want the solution to be the same as the code and to be the same as the output, but in a different way

Data Field Encapsulation

1- CircleWithPrivateDataFields

2- TestCircleWithPrivateDataFields

kind of code is java

And please explain the solution

\begin{tabular}{l} \multicolumn{1}{c|}{ Circle } \\ \hline -radius: double \\ -numberOfObjects: int \\ \hline +Circle() \\ +Circle(radius: double) \\ +getRadius(): double \\ +setRadius(radius: double): void \\ +getNumberOfObjects (): int \\ +getArea(): double \\ \hline \end{tabular} \begin{tabular}{l} \multicolumn{1}{c|}{ Circle } \\ \hline -radius: double \\ -numberOfObjects: int \\ \hline +Circle() \\ +Circle(radius: double) \\ +getRadius(): double \\ +setRadius(radius: double): void \\ +getNumberOfObjects (): int \\ +getArea(): double \\ \hline \end{tabular}