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Update Java内存区域.md
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docs/java/jvm/Java内存区域.md

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@@ -317,7 +317,7 @@ System.out.println(str2==str3);//false
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System.out.println(str3 == str5);//true
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System.out.println(str4 == str5);//false
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```
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![](https://my-blog-to-use.oss-cn-beijing.aliyuncs.com/2019-6/字符串拼接.png)
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![字符串拼接](https://my-blog-to-use.oss-cn-beijing.aliyuncs.com/2019-7/字符串拼接-常量池2.png)
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尽量避免多个字符串拼接,因为这样会重新创建对象。如果需要改变字符串的话,可以使用 StringBuilder 或者 StringBuffer。
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### 4.2 String s1 = new String("abc");这句话创建了几个字符串对象?

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