A November 11 feature article presents two Core Java Technology
Tech Tips, titled "What's New in the Math Class," and "Changes
in Working with ContentPane," which explain the new methods that
were added to the Math and StrictMath classes in J2SE 5.0, and
how much easier it is now to add components to Swing containers.

Read about it here:
java.sun.com/.../tt1102.html?ssobm=yg