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Update Java疑难点.md
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docs/java/Java疑难点.md

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@@ -78,7 +78,7 @@ System.out.println(x == y);// true
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Integer a = new Integer(3);
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Integer b = new Integer(3);
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System.out.println(a == b);//false
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System.out.println(a.equals(b));//false
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System.out.println(a.equals(b));//true
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```
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当使用自动装箱方式创建一个Integer对象时,当数值在-128 ~127时,会将创建的 Integer 对象缓存起来,当下次再出现该数值时,直接从缓存中取出对应的Integer对象。所以上述代码中,x和y引用的是相同的Integer对象。

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