publicclassIntegerArrayInitializationExample{publicstaticvoidmain(String[]args){Integer[]arr=newInteger[10];for(inti=0;i<arr.length;i++){arr[i]=newInteger(10);}}} 1. 2. 3. 4. 5. 6. 7. 8. 状态图 下面是初始化Integer数组的状态图,使用mermaid语法进行标识: 创建数组对象分配内存空间设定初始...
Effective Java 之---关于延迟初始化 1、大多数情况下,正常的初始化要优先于延迟初始化。 2、如果利用延迟优化来破坏初始化的循环,就要使用同步访问方法,因为它是最简单、最清楚的替代方法。 3、如果出于性能考虑需要对静态域使用延迟初始化,就使用lazy initialization holder class 模式,保证类要到被用到的时候...
* may be controlled by the {@code -XX:AutoBoxCacheMax=} option. * During VM initialization, java.lang.Integer.IntegerCache.high property * may be set and saved in the private system properties in the * sun.misc.VM class. */ private static class IntegerCache { static final int low = -...
Java 在编译的时候,Integer c1 = 128;会被翻译成:Integer c1 = Integer.valueOf(128); int 与 Integer 比较的时候发生自动拆箱,将 Integer 自动变为 int,不管值为多少始终是相等的,所以:a1 == b1,b1 == c1; 2.1 Integer的缓存问题 一个字节 8 位,即可表示 2^8 = 256,有符号数那就是 -128~128了,...
* During VM initialization, java.lang.Integer.IntegerCache.high property * may be set and saved in the private system properties in the * sun.misc.VM class. */ private static class IntegerCache { static final int low = -128; static final int high; static final Integer cache[]; static ...
* During VM initialization, java.lang.Integer.IntegerCache.high property * may be set and saved in the private system properties in the * sun.misc.VM class. */ privatestaticclassIntegerCache{ staticfinalintlow=-128; staticfinalinthigh;
sun.misc.VM.getSavedProperty("java.lang.Integer.IntegerCache.high");if(integerCacheHighPropValue !=null) {try{ int i =parseInt(integerCacheHighPropValue);//获取配置文件和127之间的最大值i =Math.max(i,127);// Maximum array size is Integer.MAX_VALUE//最大值范围h =Math.min(i,Integer.MAX_...
* During VM initialization, java.lang.Integer.IntegerCache.high property * may be set and saved in the private system properties in the * jdk.internal.misc.VM class. * * WARNING: The cache is archived with CDS and reloaded from the shared ...
●因为Integer是包装类型，使用时可以采用 Integer i = new Integer(1) 的形式，但因为Java中的自动...
* During VM initialization, java.lang.Integer.IntegerCache.high property * may be set and saved in the private system properties in the * sun.misc.VM class. */ private static class IntegerCache { static final int low = -128; static final int high; static final Integer cache[]; static {...