重写equals 和 hashCode-优快云博客

本文链接：https://blog.youkuaiyun.com/chenqqabcdchenqqabcd/article/details/8697094

本文详细解析了 BinHelper 类的实现细节，包括其继承关系、序列化标识、构造方法及 equals 和 hashCode 方法的具体实现。通过对比对象属性来判断对象是否相等，并采用特定算法计算对象的哈希值。

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import com.acer.agbs.model.MdBin;

public class BinHelper
   extends MdBin {


    private static final long serialVersionUID = 1L;

    public BinHelper() {
   super();
    }

    @Override
    public boolean equals(Object obj) {
   if (this == obj)
        return true;
   if (obj == null)
        return false;
   if (getClass() != obj.getClass())
        return false;
   final BinHelper other = (BinHelper) obj;
   if (getAid() == null) {
        if (other.getAid() != null)
       return false;
   } else if (!getAid().equals(other.getAid()))
        return false;
   if (getCode() == null) {
        if (other.getCode() != null)
       return false;
   } else if (!getCode().equals(other.getCode()))
        return false;
   if (getAcWhBusinessPurpose().getDescription() == null) {
        if (other.getAcWhBusinessPurpose().getDescription() != null)
       return false;
   } else if (!getAcWhBusinessPurpose().getDescription().equals(getAcWhBusinessPurpose().getDescription()))
        return false;
   if (getAcTypeWhMaterial().getDescription() == null) {
        if (other.getAcTypeWhMaterial().getDescription() != null)
       return false;
   } else if (!getAcTypeWhMaterial().getDescription().equals(getAcTypeWhMaterial().getDescription()))
        return false;
   return true;
    }

    @Override
    public int hashCode() {
   final int prime = 31;
   int result = 1;
   result = prime * result + ((getAid() == null) ? 0 : getAid().hashCode());
   result = prime * result + ((getCode() == null) ? 0 : getCode().hashCode());
   result = prime
       * result
       + ((getAcWhBusinessPurpose().getDescription() == null) ? 0 : getAcWhBusinessPurpose().getDescription().hashCode());
   result = prime * result
       + ((getAcTypeWhMaterial().getDescription() == null) ? 0 : getAcTypeWhMaterial().getDescription().hashCode());
   return result;
    }
}