AbstractStringBuilder是StringBuilder与StringBuffer的公共父类,定义了一些字符串的基本操作,如expandCapacity、append、insert、indexOf等公共方法。StringBuffer对方法加了同步锁或者对调用的方法加了同步锁,所以是线程安全的。StringBuilder并没有对方法进行加同步锁,所以是非线程安全的。 性能 每次对String类型进行改变的时候...
Map<String, Double> ret = new HashMap<String, Double>(); // Put in legacy values Double mem = ObjectReader.getDouble(conf.get(Config.SUPERVISOR_MEMORY_CAPACITY_MB), 4096.0); ret.put(Config.SUPERVISOR_MEMORY_CAPACITY_MB, mem); Double cpu = ObjectReader.getDouble(conf.get(Config.SUPERVISOR...
The performance of their eviction policy degrades as the cache size increases due to a poor sampling implementation in their custom hash table. This implies that the more critical, performance sensitive caches are the most likely to be vulnerable and easiest to exploit due to their central usage....
privateMap<String, Double> mkSupervisorCapacities(Map<String, Object> conf) {Map<String, Double> ret =newHashMap<String, Double>();// Put in legacy valuesDouble mem = ObjectReader.getDouble(conf.get(Config.SUPERVISOR_MEMORY_CAPACITY_MB),4096.0);ret.put(Config.SUPERVISOR_MEMORY_CAPACITY_MB, ...
.java:101) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1603) at java.base/java.util....
return map; } if (orig instanceof Hashtable) return new Hashtable(orig); return new LinkedHashMap(orig); } 代码示例来源:origin: org.codehaus.groovy/groovy public void run() { InputStream in = new BufferedInputStream(getIn(left)); OutputStream out = new BufferedOutputStream(getOut(right))...
if(originstanceofQueue){ returncreateSimilarQueue((Queue<T>)orig); } returnnewArrayList<T>(newCapacity); } 代码示例来源:origin: org.codehaus.groovy/groovy /** * get value from char[] using normalized index */ publicstaticcharcArrayGet(char[]a,inti){ ...
when you reach capacity, resize to double the size when popping an item, if size is 1/4 of capacity, resize to half Time O(1) to add/remove at end (amortized for allocations for more space), index, or update O(n) to insert/remove elsewhere Space contiguous in memory, so proximit...