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Update Java8Tutorial.md
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docs/java/What's New in JDK8/Java8Tutorial.md

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@@ -442,15 +442,15 @@ optional.ifPresent((s) -> System.out.println(s.charAt(0))); // "b"
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首先看看Stream是怎么用,首先创建实例代码的用到的数据List:
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```java
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List<String> stringCollection = new ArrayList<>();
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stringCollection.add("ddd2");
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stringCollection.add("aaa2");
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stringCollection.add("bbb1");
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stringCollection.add("aaa1");
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stringCollection.add("bbb3");
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stringCollection.add("ccc");
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stringCollection.add("bbb2");
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stringCollection.add("ddd1");
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List<String> stringList = new ArrayList<>();
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stringList.add("ddd2");
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stringList.add("aaa2");
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stringList.add("bbb1");
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stringList.add("aaa1");
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stringList.add("bbb3");
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stringList.add("ccc");
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stringList.add("bbb2");
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stringList.add("ddd1");
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```
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Java 8扩展了集合类,可以通过 Collection.stream() 或者 Collection.parallelStream() 来创建一个Stream。下面几节将详细解释常用的Stream操作:

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