java - java中如何关闭一个文件

Question

这是我的代码:

FileWriter fw = new FileWriter(log,true);
BufferedWriter bw = new BufferedWriter(fw);
StringWriter sw = new StringWriter();
PrintWriter pw = new PrintWriter(sw);

fw.close();
bw.close();
sw.close();
pw.close();

我想把它改成这样:

BufferedWriter bw = new BufferedWriter(new FileWriter(log,true));
PrintWriter pw = new PrintWriter(new StringWriter());

bw.close();
pw.close();

这是否正确，或者缺少的 close() 调用会导致问题吗？

Answer 1

为了确保关闭不会被忘记，您可以使用try-with-resource语句

try (BufferedWriter bw = new BufferedWriter(new FileWriter(log, true));
        PrintWriter pw = new PrintWriter(new StringWriter())) {
    // do your processing here
} catch (IOException ex) {
    // do your exception handling
}

编译器将为您添加 close() 的适当代码。