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GeezerVison is showing github.com — JavaSourceCode/test/java/lang/IntegerTest.java at main · Kelab/JavaSourceCode Expand file tree/ Copy pathIntegerTest.javaMore file actions 19 lines (18 loc) · 776 Bytes / Copy pathIntegerTest.javaFile metadata and controls19 lines (18 loc) · 776 Bytes 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 package java.lang; /** * IntegerCache 会缓存[-128,127]的 Integer（为了自动装箱的复用），valueOf 方法会从缓存中去拿值，如果命中缓存，会减少资源的开销 * 对象池模式：空间换时间 * * @author wupx * @date 2020/04/26 */ public class IntegerTest { public static void main(String[] args) { Integer i1 = 66;// 通过反编译可以知道 Integer i = 66; 这种形式声明的变量是通过 java.lang.Integer#valueOf(int) 来构造 Integer 对象的 Integer i2 = 66; Integer i3 = 128; Integer i4 = 128; System.out.println(i1 == i2);// true，在[-128,127]内时，会直接从 IntegerCache 中获取 Integer System.out.println(i3 == i4);// false，属于两个对象 } } |
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