Right-click the Java file you want to edit and select "Open With." Click your Java compiler to open the code in the editor. Add the "Random" class library to the top of the source code file.

Java's Graphics2D class provides methods to draw primitive shapes, ... import java.awt.Graphics2D; import java.util.Random; ... For example, the following code ...

There are only a few key intefaces you need to master in order to become a competent functional programmer. If you understand the concepts laid out in this functional Consumer interface example, ...