Performance Tuning Code Samples

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There are a number of strategies and tactics for developing high-performance applications and applets with Java technology. See also Performance code samples from Java Platform Performance Strategies and Tactics.

• Caching
• Input/Output

• Cacheable.java is an interface for a caching services.
  
  
• CacheManager.java supports expiration rules by which cached objects in the caching service defined by Cacheable.java must abide.
  
  
• CachedManagerTestProgram.java is a generic wrapper class that can contain any object to be placed in the caching service defined by Cacheable.java.
  
  
• CacheManagerTestProgram.java is a simple test program for testing the caching service defined by Cacheable.java.
  
  
• EntityCache.java shows a simple cache implementation for external entities. For more information see Java Technology and XML: Performance Improvement Tips.
  
  

• Buffered Reading infrequently accesses the underlying system, which provides a performance boost. For supporting information see Tuning Java I/O Performance.
  
  
• Direct Buffering eliminates read method calls. For supporting information see Tuning Java I/O Performance.
  
  
• Disabling Line Buffering writes the integers 1..100000 to the output, and runs about three times faster than the default equivalent that has line buffering enabled. Tuning Java I/O Performance.
  
  
• Formatting Costs shows an efficient way to write data formatting to a file. Tuning Java I/O Performance.
  
  
• Reading and Writing Text Files uses read method calls, which is faster than using DataInputStream.readLine. Tuning Java I/O Performance.
  
  
• ReadRandom.java improves performance by buffering on top of a RandomAccessFile and implementing a byte read method. Tuning Java I/O Performance.
  
  
• UTF8 Encoding uses the UTF8 encoding, which has the property of encoding ASCII text as itself, and other characters as two or three bytes. Tuning Java I/O Performance.
  
  
• Whole File determines the length of a file then reads the whole file. Tuning Java I/O Performance.