如果利用原始数据类型,可以将其修改为: class CompactCounter { private volatile long counter; private static final AtomicLongFieldUpdater<CompactCounter> updater = AtomicLongFieldUpdater.newUpdater(CompactCounter.class, "counter"); public void increase() { updater.incrementAndGet(this); } } 1. 2. 3. 4...
因为ava在进行编译时 Integer g = 130会被编译成 Integer.valueOf(130) ,这个可以通过反编译class文件看到。而通过Integer源码可以得出,Integer.valueOf() 方法会在数值-128~127之间会对Integer进行缓存,不会再重新new一个,所以 e==f ;当数值二大于127或者小于-128的时候则会重新new一个,所以g != h 。 Inte...
而按照Javadoc文档，该缓存机制默认会缓存在 -128 到 127 之间的值，不在该区间的值并不会进行缓存。...
The Integer class wraps a value of the primitive type int in an object. An object of type Integer contains a single field whose type is int. In addition, this class provides several methods for converting an int to a String and a String to an int, as well as other constants and ...
private satic class IntegerCache { satic fnal int low = -128; satic fnal int high; satic fnal Integer cache[]; satic { // high value may be confgured by property int h = 127; String integerCacheHighPropValue = VM.getSavedProperty("java.lang.Integer.IntegerCache.high"); ...
private static class IntegerCache { static final int low = -128; static final int high; static final Integer cache[]; static { // high value may be configured by property int h = 127; String integerCacheHighPropValue = sun.misc.VM.getSavedProperty("java.lang.Integer.IntegerCache.high"); ...
private static class IntegerCache { static final int low = -128; static final int high; static final Integer cache[]; static { // high value may be configured by property int h = 127; String integerCacheHighPropValue = VM.getSavedProperty("java.lang.Integer.IntegerCache.high"); ... //...
privatestaticclassIntegerCache{ staticfinalintlow=-128; staticfinalinthigh; staticfinalIntegercache[]; static{ // high value may be configured by property inth=127; StringintegerCacheHighPropValue= sun.misc.VM.getSavedProperty("java.lang.Integer.IntegerCache.high"); ...
private satic class IntegerCache { satic fnal int low = -128; satic fnal int high; satic fnal Integer cache[]; satic { // high value may be confgured by property int h = 127; String integerCacheHighPropValue = VM.getSavedProperty("java.lang.Integer.IntegerCache.high"); ... // range...
private satic class IntegerCache { satic fnal int low = -128; satic fnal int high; satic fnal Integer cache[]; satic { // high value may be confgured by property int h = 127; String integerCacheHighPropValue = VM.getSavedProperty("java.lang.Integer.IntegerCache.high"); ...