Java cqengine铁路超高指数等于
我试图添加一个索引,其中我的覆盖Java cqengine铁路超高指数等于,java,cqengine,Java,Cqengine,我试图添加一个索引,其中我的覆盖equals()确定两个对象是否相同 Car.java public static class Car { final String id; private String name; public Car(String id, String name) { this.id = id; this.name = name; } publ
equals()
确定两个对象是否相同
Car.java
public static class Car {
final String id;
private String name;
public Car(String id, String name) {
this.id = id;
this.name = name;
}
public String getId() {
return id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public static final Attribute<Car, Car> CAR = new SimpleAttribute<Car, Car>() {
@Override
public Car getValue(Car car, QueryOptions queryOptions) {
return car;
}
};
@Override
public String toString() {
return "Car{" + "id=" + id + ", name=" + name + '}';
}
}
public static final ResultSet<Car> get(final IndexedCollection<Car> indexedCollection, final Car car) {
return indexedCollection.retrieve(QueryFactory.equal(Car.CAR, car));
}
public static void main(String args[]) {
IndexedCollection<Car> cars = new ConcurrentIndexedCollection<>();
cars.addIndex(NavigableIndex.onAttribute(Car.CAR));
}
公共静态类车{
最终字符串id;
私有字符串名称;
公共车辆(字符串id、字符串名称){
this.id=id;
this.name=名称;
}
公共字符串getId(){
返回id;
}
公共字符串getName(){
返回名称;
}
公共void集合名(字符串名){
this.name=名称;
}
公共静态最终属性CAR=新的SimpleAttribute(){
@凌驾
公共汽车getValue(汽车、查询选项查询选项){
返回车;
}
};
@凌驾
公共字符串toString(){
返回“Car{”+“id=“+id+”,name=“+name+”}”;
}
}
Fetcher.java
public static class Car {
final String id;
private String name;
public Car(String id, String name) {
this.id = id;
this.name = name;
}
public String getId() {
return id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public static final Attribute<Car, Car> CAR = new SimpleAttribute<Car, Car>() {
@Override
public Car getValue(Car car, QueryOptions queryOptions) {
return car;
}
};
@Override
public String toString() {
return "Car{" + "id=" + id + ", name=" + name + '}';
}
}
public static final ResultSet<Car> get(final IndexedCollection<Car> indexedCollection, final Car car) {
return indexedCollection.retrieve(QueryFactory.equal(Car.CAR, car));
}
public static void main(String args[]) {
IndexedCollection<Car> cars = new ConcurrentIndexedCollection<>();
cars.addIndex(NavigableIndex.onAttribute(Car.CAR));
}
公共静态最终结果集get(最终索引集合IndexedCollection,最终汽车){
return indexedCollection.retrieve(QueryFactory.equal(Car.Car,Car));
}
Main.java
public static class Car {
final String id;
private String name;
public Car(String id, String name) {
this.id = id;
this.name = name;
}
public String getId() {
return id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public static final Attribute<Car, Car> CAR = new SimpleAttribute<Car, Car>() {
@Override
public Car getValue(Car car, QueryOptions queryOptions) {
return car;
}
};
@Override
public String toString() {
return "Car{" + "id=" + id + ", name=" + name + '}';
}
}
public static final ResultSet<Car> get(final IndexedCollection<Car> indexedCollection, final Car car) {
return indexedCollection.retrieve(QueryFactory.equal(Car.CAR, car));
}
public static void main(String args[]) {
IndexedCollection<Car> cars = new ConcurrentIndexedCollection<>();
cars.addIndex(NavigableIndex.onAttribute(Car.CAR));
}
publicstaticvoidmain(字符串参数[]){
IndexedCollection cars=新的ConcurrentIndexedCollection();
cars.addIndex(NavigableIndex.onAttribute(Car.Car));
}
问题在这一行cars.addIndex(NavigableIndex.onAttribute(Car.Car))代码>其中错误消息为找不到适用于onAttribute(属性)的方法
。我是做错了什么,还是应该使用另一个调用来代替?删除cars.addIndex(NavigableIndex.onAttribute(Car.Car))代码>,因为它不是一个真正有用的索引。。。我认为这不是开发者的动机。您应该为CAR\u ID
和CAR\u NAME
创建属性,并创建一个比较查询。在这种情况下,我将IndexedCollection
误用为一个简单的Set
。但是如果我正确理解您的意思,这里有一个可能的解决方案:
在车内覆盖等于:
class Car {
private final int id;
private String name;
public Car(int i, String name) {
this.id = i;
this.name = name;
}
public int getId() {
return id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public boolean equals(Object obj) {
if(this == obj) return true;
if(obj == null) return false;
if (!(obj instanceof Car)) return false;
Car car = (Car) obj;
if(car.getId() == this.getId())
if(car.getName().equals(this.getName()))
return true;
return false;
}
public static final Attribute<Car, Car> CAR = new SimpleAttribute<Car, Car>() {
@Override
public Car getValue(Car car, QueryOptions queryOptions) {
return car;
}
};
@Override
public String toString() {
return "Car{" + "id=" + id + ", name=" + name + '}';
}
}
等级车{
私有最终int id;
私有字符串名称;
公共汽车(整数i,字符串名称){
这个id=i;
this.name=名称;
}
公共int getId(){
返回id;
}
公共字符串getName(){
返回名称;
}
公共void集合名(字符串名){
this.name=名称;
}
@凌驾
公共布尔等于(对象obj){
如果(this==obj)返回true;
if(obj==null)返回false;
如果(!(车载obj实例))返回false;
汽车=(汽车)obj;
if(car.getId()==this.getId())
if(car.getName().equals(this.getName()))
返回true;
返回false;
}
公共静态最终属性CAR=新的SimpleAttribute(){
@凌驾
公共汽车getValue(汽车、查询选项查询选项){
返回车;
}
};
@凌驾
公共字符串toString(){
返回“Car{”+“id=“+id+”,name=“+name+”}”;
}
}
主要内容:
IndexedCollection<Car> cars = new ConcurrentIndexedCollection<>();
cars.add(new Car(1, "test"));
cars.add(new Car(2, "test2"));
cars.add(new Car(3, "test3"));
Car s = new Car(2, "test2");
ResultSet<Car> cs= cars.retrieve(QueryFactory.equal(Car.CAR, s));
cs.forEach(c -> System.out.println(c.toString()));
IndexedCollection cars=新的ConcurrentIndexedCollection();
添加(新车(1,“测试”);
添加(新车(2,“测试2”);
添加(新车(3,“测试3”);
汽车s=新车(2,“测试2”);
结果集cs=cars.retrieve(QueryFactory.equal(Car.Car,s));
cs.forEach(c->System.out.println(c.toString());
索引收集车
需要一辆车
,但属性车
不是一辆车。这有点像简单的尝试。尝试调用getValue()
@asdf:我在哪里调用getValue()
完全正确?参见此示例:@asdf:I实际上没有看到在任何地方使用equals()
?您应该首先解决另一个问题。。。