待加深记忆内容

let copy = JSON.parse(JSON.stringify(person))

git gc --aggressive --prune=now

public class Hello{
public T test(T a){
return a;
}
}
public static B getValue(Map map, A key) {
return map.get(key);
}

public class Hello{
public static void test(List a){}
public static void main(String[] args) {
test(new ArrayList());
}
}