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Update Java内存区域.md

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Original file line number	Diff line number	Diff line change
`@@ -317,7 +317,7 @@ System.out.println(str2==str3);//false`
`317`	`317`	`System.out.println(str3 == str5);//true`
`318`	`318`	`System.out.println(str4 == str5);//false`
`319`	`319`	```
`320`		`-![](https://my-blog-to-use.oss-cn-beijing.aliyuncs.com/2019-6/字符串拼接.png)`
	`320`	`+![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)`
`321`	`321`
`322`	`322`	`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。`
`323`	`323`	`### 4.2 String s1 = new String("abc");这句话创建了几个字符串对象?`

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