Sample code from 06-23

• LoopExperiment.java
• StringValueOf.java
• StringMiscellaneous2.java
• StringConcatenation.java
• SubString.java
• StringIndexMethods.java
• StringStartEnd.java
• StringCompare.java
• StringMiscellaneous.java
• StringConstructors.java
• RandomIntegers.java
• MathTest.java
• AccountTest.java
• Account.java