java try catch块的特殊语法 [英] Special syntax of java try catch block

问题描述

Charset charset = Charset.forName("US-ASCII");
try (BufferedReader reader = Files.newBufferedReader(file, charset)) {
    String line = null;
    while ((line = reader.readLine()) != null) {
        System.out.println(line);
    }
} catch (IOException x) {
    System.err.format("IOException: %s%n", x);
}

我在 Java教程，其中括号语句位于关键字'try'之后。这有效吗？为什么不能eclipse识别它并报告语法错误？

I saw such a piece of code on The Java Tutorials, in which a bracket statement is after key word 'try'. Is this valid? why cannot eclipse recognize it and report syntax error?

推荐答案

这是Java 7的尝试使用资源功能。

It is the Java 7's try with resource feature.

你需要将Eclipse的编译器合规性级别设置为1.7，以便识别语法。

You need to set Eclipse's Compiler Compliance level to 1.7 for it to recognize the syntax.

您可以在窗口>下全局设置它。偏好> Java>编译器或者只是右键单击项目并执行如下所示：

You can either set it globally under Window > Preferences > Java > Compiler or simply right-click on the project and do as shown below:

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