小例子：main.rs

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mod test_mod {
    pub struct TestStruct {
        num: u32,
    }

    impl TestStruct {
        pub fn new() -> TestStruct {
            TestStruct { num: 0}
        }
        pub fn get_num(&self) -> u32 { self.num }
        pub fn set_num(&mut self, value: u32) { self.num = value}
    }
}

use test_mod::TestStruct;

fn main() {
    let mut i = TestStruct::new();
    println!("i: {}", i.get_num());
    i.set_num(30);
    println!("i: {}", i.get_num());
}