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Update java新特性总结.md

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Original file line number	Diff line number	Diff line change
`@@ -864,7 +864,7 @@ System.out.println(encodedString);`
`864`	`864`
`865`	`865`	`### 预览新特性`
`866`	`866`
`867`		`-#### record 关键字`
	`867`	`+#### 密封类`
`868`	`868`
`869`	`869`	`Java 15 对 Java 14 中引入的预览新特性进行了增强,主要是引入了一个新的概念密封类(Sealed Classes)。`
`870`	`870`
`@@ -892,11 +892,6 @@ public non-sealed class Manager extends Person {`
`892`	`892`
`893`	`893`	`![](https://guide-blog-images.oss-cn-shenzhen.aliyuncs.com/javaguide/image-20210820153955587.png)`
`894`	`894`
`895`		-在 `java.lang.Class` 增加了两个公共方法用于获取 `Record` 类信息:
`896`		`-`
`897`		-1. `RecordComponent[] getRecordComponents()`
`898`		-2. `boolean isRecord()`
`899`		`-`
`900`	`895`	`#### instanceof 模式匹配`
`901`	`896`
`902`	`897`	`Java 15 并没有对此特性进行调整,继续预览特性,主要用于接受更多的使用反馈。`

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