Result & Panic
这次讲得详细，从错误的来历及简写过程，
都写明白了，
先浅，再深，先深，再浅，
反复之，
学习王道~
use std::fs::File; //use std::io::ErrorKind; fn main() { //panic!("crash and burn"); //let v = vec![1, 2, 3]; //v[99]; /* let f = File::open("hello.txt"); let f = match f { Ok(file) => file, Err(error) => match error.kind() { ErrorKind::NotFound => match File::create("hello.txt") { Ok(fc) => fc, Err(e) => panic!("Try create new file, but error : {:#?}", e), }, other_error => panic!("There was a problem opening the file: {:#?}", other_error), }, }; let f = File::open("hello.txt").map_err(|error| { if error.kind() == ErrorKind::NotFound { File::create("hello.txt").unwrap_or_else(|error| { panic!("Try create new file, but error : {:#?}", error); }) } else { panic!("There was a problem opening the file: {:#?}", error); } }); */ //let f = File::open("hello.txt").unwrap(); let f = File::open("hello.txt").expect("Failed to open hello.txt"); println!("f value is {:#?}", f); }转载于:https://www.cnblogs.com/aguncn/p/11406912.html
相关资源：JAVA上百实例源码以及开源项目