To allow a BlackBerry® Java® Application to use resources efficiently, consider the following guidelines:

• Use local variables.
• Use shorthand for evaluating Boolean conditions.
• Make classes final.
• Use int instead of long.
• Avoid garbage collection.
• Use static variables for Strings.
• Avoid the String(String) constructor.
• Write efficient loops.
• Optimize subexpressions.
• Optimize division operations.
• Avoid java.util.Enumeration.
• Perform casts using instanceof.
• Evaluate conditions using instanceof.
• Avoid using StringBuffer.append (StringBuffer).
• Avoid returning null.
• Avoid passing null into methods.
• Use caution when passing null into a constructor.
• Use long for unique identifiers.
• Exit applications correctly.
• Print the stack trace.

• Using local variables
  
• Using shorthand for evaluating Boolean conditions
  
• Making classes final
  
• Using int instead of long
  
• Avoiding garbage collection
  
• Using static variables for Strings
  
• Avoiding the String(String) constructor
  
• Writing efficient loops
  
• Optimizing subexpressions
  
• Optimizing division operations
  
• Avoiding java.util.Enumeration
  
• Performing casts using instanceof
  
• Evaluating conditions using instanceof
  
• Avoiding StringBuffer.append (StringBuffer)
  
• Avoiding returning null
  
• Avoiding passing null into methods
  
• Using caution when passing null into a constructor
  
• Using longs for unique identifiers
  
• Exiting applications correctly
  
• Printing the stack trace