A DESCRIPTION OF THE PROBLEM :
The sample code does not compile.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Compile.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
No compilation error
ACTUAL -
cannot find symbol
         field.setInputVerifier(new InputVerifier() {
         ^
  symbol: variable field
  location: class VerifierTest
1 error

---------- BEGIN SOURCE ----------
Example from API
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CUSTOMER SUBMITTED WORKAROUND :
Solution:
Rectify line
         field.setInputVerifier(new InputVerifier() {
to
         field1.setInputVerifier(new InputVerifier() {