Java - 使用 try-with-resources 实现自动关闭资源

BufferedReaderbr=null;
Stringstr;
try {
br=newBufferedReader(newFileReader(""));
while ((str=br.readLine()) !=null) {
System.out.println(str);
    }
} catch (IOExceptione) {
e.printStackTrace();
} finally {
if (br!=null) {
try {
br.close();
        } catch (IOExceptione) {
e.printStackTrace();
        }
    }
}

try (BufferedReaderbr=newBufferedReader(newFileReader(""))) {
while ((str=br.readLine()) !=null) {
System.out.println(str);
    }
} catch (IOExceptione) {
e.printStackTrace();
}

classTestAutoClosableimplementsAutoCloseable {
@Overridepublicvoidclose() throwsException {
System.out.println("close");
    }
publicvoidtest() {
System.out.println("test");
    }
}

try (BufferedReaderbr=newBufferedReader(newFileReader("E:/test.txt"));
TestAutoClosabletestAutoClosable=newTestAutoClosable()) {
testAutoClosable.test();
} catch (Exceptione) {
e.printStackTrace();
}