java - 没有在类中定义具有 3 个参数的构造函数？

Question

让我澄清一下，我完全是 Spring 框架的初学者。

我有三个类文件，现在我在 beans.xml 中遇到错误。你可以看看我的代码。

这是MyAddress.java:

package com.project;

public class MyAddress {
    private String city;
    private String state;
    private String address;

    public void Address(String city, String state, String address){
        this.city=city;
        this.state=state;
        this.address=address;
    }

    public String toString(){
        return city+" "+state+" "+address;
    }
}

这是我的 Employee.java

package com.project;

public class Employee {
    private int id;
    private String name;
    private MyAddress address;

    public Employee(){
        System.out.print("Default constructor..");
    }

    public void Employee(int id, String name, MyAddress address){
        this.id=id;
        this.name=name;
        this.address=address;
    }

    public void show(){
        System.out.println(id+" "+name);
        System.out.println(address.toString());
    }
}

这是我的 MainProgram.java

package com.project;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class MainProgram {
    public static void main(String[] args){

        ApplicationContext ac=new ClassPathXmlApplicationContext("beans.xml");

        Employee em=(Employee)ac.getBean("e");

        em.show();
    }
}

最后是我的 beans.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="e" class="com.project.MyAddress">
        <constructor-arg value="USA" type="String"></constructor-arg>
        <constructor-arg value="Delhi" type="String"></constructor-arg>
        <constructor-arg value="Bangalore" type="String"></constructor-arg>
    </bean>

    <bean id="e2" class="com.project.Employee">
        <constructor-arg value="123" type="int"></constructor-arg>
        <constructor-arg value="raj"></constructor-arg>
        <constructor-arg>
            <ref bean="e"/>
        </constructor-arg>
    </bean>

</beans>

我在 beans.xml 文件中遇到错误，因为 No constructor with 3 arguments defined in class

请帮忙，这是什么意思？

当然，我们将不胜感激!

Answer 1

这个

public void Address(String city, String state, String address)

应该是

public MyAddress(String city, String state, String address)

你的构造函数中的类名错误，此外，构造函数没有返回类型。

Employee 也有类似的错误:

public void Employee(int id, String name, MyAddress address)

应该是

public Employee(int id, String name, MyAddress address)