learn-java

Sources:

• Head First Java 2nd Edition
• MOOC on Coursera: Java for Android

ProTips:

• When calculating the volume of a sphere, 4/3 pi r^3, always write4.0/3.0 * Math.PI * Math.pow(radius,3).
  Pay attention to the 4.0/3.0, if you write 4/3, Java will return 1 because integers always rounded down.