Square.java

Below is the syntax highlighted version of Square.java from §3.3 Designing Data Types.

/******************************************************************************
 *  Compilation:  javac Square.java
 *  Execution:
 *
 *  A function that implements the Function interface.
 *
 ******************************************************************************/

public class Square implements Function {
    public double evaluate(double x) {
        return x*x;
    }
}