Therangemethod in theIntegerclass provides a convenient and efficient way to generate a range of integers in Java. It allows you to easily create and work with sequential ranges of numbers without having to manually create a loop. By using therangemethod, you can write cleaner and more concise...
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...
* 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...
* char in the range \u0000 to \u007F 为了更容易理解问题,用Jad将上面代码反编译,如下: import java.io.PrintStream; public class Test { public Test() { } public static void main(String args[]) { Integer i1 = Integer.valueOf(128); ...
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[一篇文章]()。 我们都知道int是 4 字节,32 比特,和 C/C++ 不同的时,Java中整型...
* 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 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. Parameters: i - an int value. Returns: an Integer instance representing i. Since: 1.5 byteValue public byte byteValue() Returns the value of this Integer as a ...
细心的小伙伴会看到文档里面有这么一句话 This method will always cache values in the range -128 to 127,inclusive, and may cache other values outside of this range.该方法会缓存-128到127之间的值,这句话又是什么意思呢。 Integer a = 120;Integer b = 120;Integer c = 300;Integer d = 300;Sys...
* 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 { ...