import java.util.ArrayList;
import java.util.List;

public class NoteBook {
private List<String> list;

public NoteBook(){
    list = new ArrayList();
}

public NoteBook(List<String> list){
    this.list = list;
}
//存储记录
//不限制能存储的记录条数
public String save(String s){
    if (list.add(s)) {
        return "存储成功";
    }
    return "存储失败";

}

//获取记录条数
public int getSum() {
    return list.size();
}

//查看每条记录
public String getAnyOne(int i) {
    if (i > 0 && i < list.size()) {
        return list.get(i);
    }
    return "没有此记录";
}

public String getAnyOne() {
    if (list.size() == 0) {
        return "没有此记录";
    }
    return list.get(0);
}

//删除记录
public String deleteOne() {
    if (list.size() == 0) {
        return "没有此记录";
    }
    return list.remove(0);
}

public String deleteOne(int i) {
    if (i > 0 && i < list.size()) {
        list.remove(i);
        return "已经移除";
    }
    return "没有此记录";
}

public void showAll() {
    list.forEach(s-> System.out.println(s));
}

public static void main(String[] ages){
    NoteBook noteBook = new NoteBook();
    noteBook.save("记录0");
    noteBook.save("记录1");
    noteBook.save("记录2");
    noteBook.save("记录3");
    System.out.println("插入结果:"+noteBook.save("记录4"));
    System.out.println("删除结果："+noteBook.deleteOne());
    System.out.println("获得条目： "+noteBook.getSum());
    System.out.println("列出一条： "+noteBook.getAnyOne(1));
    noteBook.showAll();
}

}