.一、
1、映射hash中键唯一
2、HashMap key可哈希,BTreeMapkey 可排序
3、HashMap无序,BTreeMap有序
二、
1、集合键(元素)唯一
2、HashSet元素可哈希,BTreeSet可排序
3、HashSet无序,BTreeSet有序
4、实质为HashMap
Finished dev [unoptimized + debuginfo] target(s) in 0.05s
Running `F:\learn\rustlearn\learn48\target\debug\learn48.exe`
{3: 30, 2: 20, 9: 90, 8: 80, 5: 50, 4: 40, 6: 60, 7: 70, 1: 10}
{10: 100, 11: 110, 12: 120, 13: 130, 14: 140, 15: 150, 16: 160, 17: 170, 18: 180, 19: 190}
hamp 包括 8=>Some(80)
bamp 包括 18=>Some(180)
{"hset1", "hset2"}
{"bset1", "bset2"}
------------------
(program exited with code: 0)
请按任意键继续. . .
use std::collections::BTreeMap;
use std::collections::HashMap;
use std::collections::HashSet;
use std::collections::BTreeSet;
fn main() {
let mut hmap=HashMap::new();
let mut bmap=BTreeMap::new();
for i in 1..10{
hmap.insert(i,i*10);
}
for i in 10..20{
bmap.insert(i,i*10);
}
println!("{:?}",hmap);
println!("{:?}",bmap);
if hmap.contains_key(&8){
println!("hamp 包括 {}=>{:?}",8,hmap.get(&8));
}
if hmap.contains_key(&18){
println!("hamp 包括 {}=>{:?}",18,bmap.get(&18));
}
if bmap.contains_key(&8){
println!("bamp 包括 {}=>{:?}",8,hmap.get(&8));
}
if bmap.contains_key(&18){
println!("bamp 包括 {}=>{:?}",18,bmap.get(&18));
}
let mut bset=BTreeSet::new();
let mut hset=HashSet::new();
hset.insert("hset1");
hset.insert("hset2");
bset.insert("bset1");
bset.insert("bset2");
println!("{:?}",hset);
println!("{:?}",bset);
}