在Spring中創建bean時出錯

Question

大家好，我是春天的初學者，我才剛開始。 我遇到錯誤

“使用類路徑資源[org / collection / ApplicationContext2.xml]中定義的名稱'question'創建bean時出錯：指定了3個構造函數參數，但在bean'question'中找不到匹配的構造函數（提示：為簡單起見，請指定index / type / name參數參數以避免類型歧義）

我有兩個類，第一個是Question，其中包含一個構造函數Question，第二個類是Answer

我正在嘗試創建答案類的引用並將其插入具有數組列表的Question類

我瞥了一眼，發現我需要指定類型。 我已經指定了它，但是仍然出現錯誤

謝謝..

Question.java

package org.collection;

import java.awt.List;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.Iterator;



public class Question {
    private int id;
    private String name;
    private ArrayList<String> answers;
    //private HashSet<String> answers1;

    public Question()
    {
        //Default constructor
    }

    public Question(int id,String name,ArrayList<String> answers)
    {
        super();
        this.id=id;
        this.name=name;
        this.answers=answers;

    }

    public void display()
    {
        System.out.println("Id :"+id+"\nName :"+name);
        System.out.println("Answers are");
        Iterator<String> itr= answers.iterator();  
        while(itr.hasNext())
        {
            System.out.println(itr.next());
        }

        /*System.out.println("----------picking up the answers from HashSet---------");
         Iterator<String> itr1=answers1.iterator();
         while(itr1.hasNext())
         {
             System.out.println(itr1.next());
         }
         System.out.println("-------reached-----------");*/



    }

}

Answer.java

package org.collection;

public class Answer {
    private int id;
    private String name;
    private String by;

    public Answer() {
        // TODO Auto-generated constructor stub
    }

    public Answer(int id,String name,String by)
    {
        super();
        this.id=id;
        this.name=name;
        this.by=by;

    }

    public String toString()
    {
        return "ID :"+id+"\nName"+name+"\nBy :"+by;
    }
}

ApplicationContext.xml2

 <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd"> <bean id="ans1" class="org.collection.Answer"> <constructor-arg value="1" type="int"></constructor-arg> <constructor-arg value="java is a progamming language hahahaha" type="java.lang.String"></constructor-arg> <constructor-arg value ="varun" type="java.lang.String"> </constructor-arg> </bean> <bean id ="ans2" class="org.collection.Answer"> <constructor-arg value="2" type="int"></constructor-arg> <constructor-arg value="java is a platfornm" type="java.lang.String"></constructor-arg> <constructor-arg value ="Rahul" type="java.lang.String"></constructor-arg> </bean> <bean id="question" class= "org.collection.Question"> <constructor-arg value="111" type="int"></constructor-arg> <constructor-arg value="What is java ?" type="java.lang.String"></constructor-arg> <constructor-arg> <list> <ref bean="ans1"/> <ref bean="ans2"/> </list> </constructor-arg> </bean> </beans> 

Answer 1

Question的三個參數構造函數期望使用String List 。 但是，您正在傳遞Answer List 。 將Question類中的第三個參數更改為ArrayList<Answer> answers