Integer Box contains: 123 String Box contains: Java Challengers Notice the following about the code: The class Box uses the type parameter E as a placeholder for the object the box will hold.

Use Java assertions to test your assumptions about program correctness and check them in ... (String[] args) { int x ... throwing NullPointerException when this parameter contains null.

Call the Java String length() method; Hold the value of the String length in a variable for future use; Java String length method() The Java String class contains a length() method that returns the ...