关于try关键字的问题，我以前也一直以为必须和catch或者finally配合使用，直到看到这个

The try-with-resources statement is a try statement that declares one or more resources. A resource is as an object that must be closed after the program is finished with it. The try-with-resources statement ensures that each resource is closed at the end of the statement. Any object that implements java.lang.AutoCloseable, which includes all objects which implement java.io.Closeable, can be used as a resource.

The following example reads the first line from a file. It uses an instance of BufferedReader to read data from the file. BufferedReader is a resource that must be closed after the program is finished with it:

static String readFirstLineFromFile(String path) throws IOException {  try (BufferedReader br = new BufferedReader(new FileReader(path))) {   
return br.readLine();
}
}
所以，大家以后不能再误导别人说try关键字不能单独使用了~

感谢楼主让我明白了这个知识

所以就是只拿到异常但是不处理吗？那这样拿到异常是为了什么？