1.8 新添加字段privatestaticfinal long serialVersionUID=1360826667806852920L;// 序列化 Integer只有一个非静态字段value,用来表示其包装的int值。0x80000000和0x7fffffff分别是 int 最小值和最大值的十六进制表示,这里要注意十六进制 int 值在内存中的表示方法,有兴趣的同学可以了解一下,这里先占个坑,有时间单独写...
* 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 { ...
使用Math.random()生成一个随机数并将其映射到所需的范围,使用Math.floor()使其成为一个整数。 constrandomIntegerInRange=(min, max)=> Math.floor(Math.random()*(max- min+1))+ min; 查看示例 randomIntegerInRange(0,5);// 2 为天地立心,为生民立命,为往圣继绝学,为天下开太平...
* the constructor {@link #Integer(int)}, as this method is likely * to yield significantly better space and time performance by * caching frequently requested values. * * This method will always cache values in the range -128 to 127, * inclusive, and may cache other values outside of t...
in preference to the constructor Integer(int), as this method is likely to yield significantly better space and time performance by caching frequently requested values. This method will always cache values in the range -128 to 127, inclusive, and may cache other values outside of this range ...
This method will always cache values in the range -128 to 127, inclusive, and may cache other values outside of this range. 此⽅法将始终缓存-128到127（包括端点）范围内的值，并可以缓存此范围之外的其他值 缓存设计 valueOf ⽅法中 IntegerCache.low = -128； IntegerCache.high = 127 ; 也就...
Integer是 int的包装类，属于引用类型，默认值为null；int 和 Integer 都可以表示某一个整型数值；Intege...
* This method will always cache values in the range -128 to 127, * inclusive, and may cache other values outside of this range. * * @param i an {@code int} value. * @return an {@code Integer} instance representing {@code i}. ...
in preference to the constructorInteger(int), as this method is likely to yield significantly better space and time performance by caching frequently requested values. This method will always cache values in the range -128 to 127, inclusive, and may cache other values outside of this range. ...
in preference to the constructor Integer(int), as this method is likely to yield significantly better space and time performance by caching frequently requested values. This method will always cache values in the range -128 to 127, inclusive, and may cache other values outside of this range ...