Java覆写equeal和hashCode方法

使用Apache commons提供的commons-lang-xxx.jar包
    下载地址：http://commons.apache.org/lang/

    覆写equals使用：org.apache.commons.lang.builder.EqualsBuilder
    覆写hashCode使用：org.apache.commons.lang.builder.HashCodeBuilder

来自apache官方的实例
public class Person {
   String name;
   int age;
   boolean smoker;
   ...
 
  // overwrite "equals"
  public boolean equals(Object obj) {
   if (obj == null) { return false; }
   if (obj == this) { return true; }
   if (obj.getClass() != getClass()) {
     return false;
   }
   Person rhs = (Person) obj;
   return new EqualsBuilder()
                 .appendSuper(super.equals(obj))
                 .append(field1, rhs.field1)
                 .append(field2, rhs.field2)
                 .append(field3, rhs.field3)
                 .isEquals();
  }

    // overwrite "hashCode"
   public int hashCode() {
     // you pick a hard-coded, randomly chosen, non-zero, odd number
     // ideally different for each class
     return new HashCodeBuilder(17, 37).
       append(name).
       append(age).
       append(smoker).
       toHashCode();
   }

 }