private boolean checkRoutePlanItemsValidity(int number, int index) { if (mRoutePlanItems == null || mRoutePlanItems.size() < number || mRoutePlanItems.get(index) == null) { return true; } return false; }怎么调用这个方法

你可以通过以下方式调用这个方法：

// 假设你有一个名为 "example" 的对象
boolean result = example.checkRoutePlanItemsValidity(5, 2);

其中，`5` 是 `number` 参数的值，`2` 是 `index` 参数的值。`result` 将是该方法的返回值。你可以根据需要传入不同的参数来调用这个方法。

相关问题

/import java.util.HashSet; import java.util.Objects; import java.util.Set; import java.util.TreeSet; public class Test1 { public static void main(String[] args){ Set<Test.Books> set = new HashSet<>(); TreeSet<Test.Books> tree = new TreeSet<>(); Test.Books books1 = new Test.Books(01,"坤坤成长史",520,"我的心"); Test.Books books2 = new Test.Books(02,"坤坤帅哥",1314,"我的脑子"); Test.Books books3 = new Test.Books(03,"双开门大冰箱",999,"我的幻想"); Test.Books books4 = new Test.Books(01,"坤坤成长史",520,"我的心"); set.add(books1); set.add(books2); set.add(books3); set.add(books4); //TreeSet(): 根据其元素的自然排序进行排序 tree.add(books1); tree.add(books2); tree.add(books3); tree.add(books4); System.out.println("HashSet:"); for(Test.Books s1 : set){ System.out.println(s1.getNumber() + s1.getname() + s1.getPrice() +s1.getPublisher()); } System.out.println("TreeSet:"); for(Test.Books s2 : tree){ System.out.println(s2.getNumber() + s2.getname() + s2.getPrice() +s2.getPublisher()); } } //Set没有带索引的方法 //TreeSet 无参构造方法 自然排序 让元素所属的类实现Comparable接口，重写compareTo方法 //重写方法，注意主要条件和次要条件 static abstract class Books implements Comparable<Books> { private int number; private String name; private double price; private String publisher; public Books(){ } Books(int number,String name,double price,String publisher){ super(); this.number = number; this.name = name; this.price = price; this.publisher = publisher; } public int getNumber(){ return number; } public String getname(){ return name; } public double getPrice() { return price; } public String getPublisher() { return publisher; } @Override public int hashCode() { return 0; } @Override public boolean equals(Object o) { if (this == o) return true; if (o == null || getClass() != o.getClass()) return false; Books books = (Books) o; return number == books.number && Double.compare(books.price, price) == 0 && Objects.equals(name, books.name) && Objects.equals(publisher, books.publisher); } public int compareTo(Books s2){ return 1; } } }请帮我修改

在 Test1 类中，你定义的 Books 类应该是一个具体的类而不是抽象类，因为你在 main 方法中实例化了它。此外，你在 compareTo 方法中返回了固定的值 1，这将导致 TreeSet 不会正确排序。你需要根据主要条件和次要条件来实现 compareTo 方法的逻辑。最后，你可以考虑在 Books 类中实现 hashCode 和 equals 方法，以确保在 Set 中正确处理对象。

下面是修改后的代码：

import java.util.HashSet;
import java.util.Objects;
import java.util.Set;
import java.util.TreeSet;

public class Test1 {
    public static void main(String[] args) {
        Set<Books> set = new HashSet<>();
        TreeSet<Books> tree = new TreeSet<>();

        Books books1 = new Books(01, "坤坤成长史", 520, "我的心");
        Books books2 = new Books(02, "坤坤帅哥", 1314, "我的脑子");
        Books books3 = new Books(03, "双开门大冰箱", 999, "我的幻想");
        Books books4 = new Books(01, "坤坤成长史", 520, "我的心");

        set.add(books1);
        set.add(books2);
        set.add(books3);
        set.add(books4);

        tree.add(books1);
        tree.add(books2);
        tree.add(books3);
        tree.add(books4);

        System.out.println("HashSet:");
        for(Books s1 : set){
            System.out.println(s1.getNumber() + s1.getName() + s1.getPrice() + s1.getPublisher());
        }

        System.out.println("TreeSet:");
        for(Books s2 : tree){
            System.out.println(s2.getNumber() + s2.getName() + s2.getPrice() + s2.getPublisher());
        }
    }

    static class Books implements Comparable<Books> {
        private int number;
        private String name;
        private double price;
        private String publisher;

        public Books(int number, String name, double price, String publisher){
            this.number = number;
            this.name = name;
            this.price = price;
            this.publisher = publisher;
        }

        public int getNumber() {
            return number;
        }

        public String getName() {
            return name;
        }

        public double getPrice() {
            return price;
        }

        public String getPublisher() {
            return publisher;
        }

        @Override
        public int compareTo(Books o) {
            if (this.price != o.price) {
                return Double.compare(this.price, o.price);
            } else if (!this.name.equals(o.name)) {
                return this.name.compareTo(o.name);
            } else {
                return Integer.compare(this.number, o.number);
            }
        }

        @Override
        public int hashCode() {
            return Objects.hash(number, name, price, publisher);
        }

        @Override
        public boolean equals(Object o) {
            if (this == o) return true;
            if (o == null || getClass() != o.getClass()) return false;
            Books books = (Books) o;
            return number == books.number &&
                    Double.compare(books.price, price) == 0 &&
                    Objects.equals(name, books.name) &&
                    Objects.equals(publisher, books.publisher);
        }
    }
}

我的presto版本不支持用offset，还有别的办法吗，比如这段代码： private static QueryAndValues generateQuery(Map<String, String> parameters) { Timer time = new Timer(); StringBuilder query = new StringBuilder("SELECT * FROM " // "( SELECT temp.*, ROW_NUMBER() OVER (ORDER BY cta_onb) AS rownum FROM ( SELECT * FROM " ).append(TABLES); List<Object> paramValues = new ArrayList<>(); boolean firstCondition = true; for (String key : parameters.keySet()) { // let's assume the keys that end with "_double" should be treated as double boolean isDouble = key.endsWith("_double"); if (!"page".equals(key) && !"size".equals(key)) { String value = parameters.get(key); if (value == null || value.isEmpty()) { query.append(firstCondition ? " WHERE " : " AND ").append(key).append(" IS NULL "); firstCondition = false; } else { if (value.contains(",")) { String[] values = value.split(","); query.append(firstCondition ? " WHERE " : " AND ").append(key).append(" IN ("); for (String val : values) { query.append("?,"); paramValues.add(isDouble ? Double.parseDouble(val) : val); } query.setLength(query.length() - 1); query.append(") "); firstCondition = false; } else { query.append(firstCondition ? " WHERE " : " AND ").append(key).append(" = ? "); paramValues.add(isDouble ? Double.parseDouble(value) : value); firstCondition = false; } } } } System.out.println("QueryAndValues 消费时间："+ time.getElapsedTims()); int size = Integer.parseInt(parameters.get("size")); int page = Integer.parseInt(parameters.get("page")); query.append(" limit 500"); // query.append(") AS temp ) AS temp2 WHERE rownum BETWEEN ? AND ?"); // paramValues.add((page - 1) * size + 1); // Start index // paramValues.add(page * size); // End index return new QueryAndValues(query.toString(), paramValues); }，用hibrenate做分页可以实现吗，如果可以，代码应该怎么修改，请附上完整代码

可以使用 Hibernate 来实现分页。下面是修改后的代码：

private static QueryAndValues generateQuery(Map<String, String> parameters) {
Timer time = new Timer();
StringBuilder query = new StringBuilder("FROM " + TABLES);
boolean firstCondition = true;
for (String key : parameters.keySet()) {
// let's assume the keys that end with "_double" should be treated as double
boolean isDouble = key.endsWith("_double");
if (!"page".equals(key) && !"size".equals(key)) {
String value = parameters.get(key);
if (value == null || value.isEmpty()) {
query.append(firstCondition ? " WHERE " : " AND ").append(key).append(" IS NULL ");
firstCondition = false;
} else {
if (value.contains(",")) {
String[] values = value.split(",");
query.append(firstCondition ? " WHERE " : " AND ").append(key).append(" IN (");
for (String val : values) {
query.append("?,");
paramValues.add(isDouble ? Double.parseDouble(val) : val);
}
query.setLength(query.length() - 1);
query.append(") ");
firstCondition = false;
} else {
query.append(firstCondition ? " WHERE " : " AND ").append(key).append(" = ? ");
paramValues.add(isDouble ? Double.parseDouble(value) : value);
firstCondition = false;
}
}
}
}

Session session = sessionFactory.openSession();
CriteriaBuilder builder = session.getCriteriaBuilder();
CriteriaQuery<Entity> criteriaQuery = builder.createQuery(Entity.class);
Root<Entity> root = criteriaQuery.from(Entity.class);
criteriaQuery.select(root).where(builder.and(paramValues.toArray(new Predicate[0])));
Query<Entity> queryObj = session.createQuery(criteriaQuery);
int size = Integer.parseInt(parameters.get("size"));
int page = Integer.parseInt(parameters.get("page"));
int start = (page - 1) * size;
queryObj.setFirstResult(start);
queryObj.setMaxResults(size);
List<Entity> results = queryObj.getResultList();

System.out.println("QueryAndValues 消费时间：" + time.getElapsedTims());

return new QueryAndValues(results, start, size);
}

注意：你需要将 Entity.class 替换成你的实体类，并在代码中添加相应的 import 语句。此外，你还需要在代码中添加 Hibernate 的配置信息和 sessionFactory 的初始化代码。