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我正在尝试使用 Jersey Java 创建一个不可变对象。但我不知道默认构造函数在大型应用程序中是否有用。有人可以指导我吗？

这是我的课：- 

package com.jersey.jaxb;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;
import org.pojomatic.Pojomatic;
import org.pojomatic.annotations.AutoProperty;

@XmlRootElement
@XmlType(name="todo")
@XmlAccessorType(XmlAccessType.FIELD)
@AutoProperty
public class Todo {

@XmlElement(name="summary")
private  final String summary;

@XmlElement(name="description")
private final String description;

public String getSummary() {
   return summary;
}

public String getDescription() {
   return description;
}

private Todo(){
   this(new Builder());
}

private Todo(Builder builder){
    this.summary = builder.summary;
    this.description = builder.description;
}

@Override 
public boolean equals(Object o) {
   return Pojomatic.equals(this, o);
}

@Override 
public int hashCode() {
  return Pojomatic.hashCode(this);
}

@Override 
public String toString() {
  return Pojomatic.toString(this);
}

public static class Builder{
    private String description;
    private String summary;

    public Builder summary(String summary){
        this.summary = summary;
        return this;
    }

    public Builder description(String description){
       this.description = description;
       return this;
    }

    public Todo build(){
       return new Todo(this);
    }
 }
}

默认构造函数也是如此：- 

 private Todo(){
   this(new Builder());
 }

帮助序列化/反序列化或根本没有用。

我不知道它在大型应用程序中会有什么影响，或者我不应该全部使用它。

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0 回答 0