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Update io-basis.md

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@ -41,7 +41,7 @@ Java IO 流的 40 多个类都是从如下 4 个抽象类基类中派生出来
`FileInputStream` 代码示例: `FileInputStream` 代码示例:
```java ```java
try (InputStream fis = new FileInputStream("input.txt)) { try (InputStream fis = new FileInputStream("input.txt")) {
System.out.println("Number of remaining bytes:" System.out.println("Number of remaining bytes:"
+ fis.available()); + fis.available());
int content; int content;