Person class (with or without parametric construction method):

package com.li.spring;

public class Person {
    
    private String name;
    private int age;
    
    public Person(){
        System.out.println("Initial constructor");
    }
    public void setName(String name) {
        System.out.println("Settings properties were invoked");
        this.name = name;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public String getName() {
        return name;
    }
    public void hello(){
        System.out.println("Hello: " + name);
    }

    @Override
    public String toString() {
        return "HelloWorld [name=" + name + ", age=" + age + "]";
    }

}

 

1. Creation of constructors

1.1 Through a parametric constructor (default)

<bean id="person" class="com.li.spring.Person" ></bean>

1.2 Through a parametric constructor (you need to add a parametric constructor to Person and assign values to attributes)

<bean id="person" class="com.li.spring.Person" >
      <constructor-arg index="0" value="someone"></constructor-arg>
      <constructor-arg index="1" value="20"></constructor-arg> 
</bean>

2. Create through factory mode

package com.li.spring;

public class PersonFactory {
    
    public Person createPerson(){
        return new Person();
        
    }
}

xml:

<bean id="personFactory" class="com.li.spring.PersonFactory"></bean>
<bean id="person" factory-bean="personFactory" factory-method="createPerson"></bean>

3. Create using static factories (add static directly on the basis of factories, do not need to create objects, use it directly)

package com.li.spring;

public class PersonFactory {
    
    public static Person createPerson(){
        return new Person();
        
    }
}

xml:

<bean id="person" class="com.li.spring.PersonFactory" factory-method="createPerson"></bean> 

Please give me some advice on the inappropriateness.