为啥list类型做参数识别不了

Question

```java

package Collection;
import java.util.List;
import java.util.ArrayList;
class Book{
    public double getPrice() {
        return price;
    }
    String name;
    double price;
    String editor;
    @Override
    public String toString() {
        return "Book{" +
                "名称:" + name + '\t' +
                " 价格:" + price +'\t'+
                " 作者:" + editor + '\t' ;
    }
    public Book(String name, double price, String editor) {
        this.name = name;
        this.price = price;
        this.editor = editor;
    }





}
public class Demol01 {
    public static void main(String[] args) {
        List list = new ArrayList();
        List list1 = new ArrayList();
        list.add(new Book("斗破苍穹", 38, "天蚕土豆"));
        list.add(new Book("九星霸体诀", 58.3, "平凡魔术师"));
        list.add(new Book("斗罗大陆", 35, "唐家三少"));
        for (Object i : list) {
            System.out.println(i);
        }
        System.out.println("========================");
        sort(list);
        System.out.println("排序后");
        for (Object i : list) {
            System.out.println(i);
        }
        public static void sort(List list){
            int listSize = list.size();
            for (int i = 0; i < listSize - 1; i++) {
                for (int j = 0; j < listSize - 1 - i; j++) {
                    Book book1 = (Book) list.get(j);
                    Book book2 = (Book) list.get(j + 1);
                    if (book1.getPrice() > book2.getPrice()) {
                        //替换book2与book1
                        list.set(j, book2);
                        list.set(j + 1, book1);
                    }
                }
            }

        }
    }
}

Answer 1

大括号错位了吧，改成这样：

package Collection;
import java.util.List;
import java.util.ArrayList;
class Book {
    public double getPrice() {
        return price;
    }
    String name;
    double price;
    String editor;
    @Override
    public String toString() {
        return "Book{" +
                "名称:" + name + '\t' +
                " 价格:" + price +'\t'+
                " 作者:" + editor + '\t' ;
    }
    public Book(String name, double price, String editor) {
        this.name = name;
        this.price = price;
        this.editor = editor;
    }
}
public class Demol01 {
    public static void main(String[] args) {
        List list = new ArrayList();
        List list1 = new ArrayList();
        list.add(new Book("斗破苍穹", 38, "天蚕土豆"));
        list.add(new Book("九星霸体诀", 58.3, "平凡魔术师"));
        list.add(new Book("斗罗大陆", 35, "唐家三少"));
        for (Object i : list) {
            System.out.println(i);
        }
        System.out.println("========================");
        sort(list);
        System.out.println("排序后");
        for (Object i : list) {
            System.out.println(i);
        }
        }
        public static void sort(List list){
            int listSize = list.size();
            for (int i = 0; i < listSize - 1; i++) {
                for (int j = 0; j < listSize - 1 - i; j++) {
                    Book book1 = (Book) list.get(j);
                    Book book2 = (Book) list.get(j + 1);
                    if (book1.getPrice() > book2.getPrice()) {
                        //替换book2与book1
                        list.set(j, book2);
                        list.set(j + 1, book1);
                    }
                }
            }
        }
}