我正在检查此代码以使用流 API 在集合数据中进行过滤。
我应该得到满足我的条件的两种产品的清单
但我得到解密格式的输出。
package streamsapi;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.stream.Collectors;
public class StreamFilter {
public static void main(String[] args) {
// TODO Auto-generated method stub
/*
* List<product>list = new ArrayList<product>(); for (product product :
* getProducts()) { if(product.getPrice()>2500f) { list.add(product); }
*
* } for (product product : list) { System.out.println(product); }
*/
List<product>list2 = getProducts().stream() .filter((product)->
product.getPrice() > 2500f) .collect(Collectors.toList());
list2.forEach(System.out::println);
}
private static List<product> getProducts(){
List<product>ProductsList = new ArrayList<product>();
ProductsList.add(new product(1,"hp",2500f));
ProductsList.add(new product(2,"Dell",3500f));
ProductsList.add(new product(3,"Asus",4500f));
return ProductsList;
}}
class product{
private int id;
private String name;
private float price;
public product(int id, String name, float price) {
super();
this.name = name;
this.id = id;
this.price = price;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public float getPrice() {
return price;
}
public void setPrice(float price) {
this.price = price;
}
}
我的输出是:
streamsapi.product@3feba861
streamsapi.product@5b480cf9
我认为你只需要重写
toString
类中的 Product
,以便 System.out::println
可以打印对象内容而不是引用
class product{
...
@Override
public String toString() {
return "Product{" +
"id=" + id +
", name=" + name +
", price='" + price + '\'' +
'}';
}
}