使用EqualsBuilder和HashCodeBuilder重写equals、hashCode方法

发表于8个月前(2014-08-31 22:49)   阅读（181） | 评论（0）

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package com.osc.demo;
 import java.util.List;
 import org.apache.commons.lang.builder.EqualsBuilder; import org.apache.commons.lang.builder.HashCodeBuilder;
 public class Teacher {
    private String name;
    private int age;
    private List student;
  
    public String getName() {
        return name;
    }
  
    public void setName(String name) {
        this.name = name;
    }
  
    public int getAge() {
        return age;
    }
  
    public void setAge(int age) {
        this.age = age;
    }
  
    public List getStudent() {
        return student;
    }
  
    public void setStudent(List student) {
        this.student = student;
    }
  
    @Override
    public boolean equals(Object obj) {
        return EqualsBuilder.reflectionEquals(this, obj);
    }
  
    @Override
    public int hashCode() {
        return HashCodeBuilder.reflectionHashCode(this);
    }
}

--

?

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package com.osc.demo;
 import org.apache.commons.lang.builder.EqualsBuilder; import org.apache.commons.lang.builder.HashCodeBuilder;
 public class Student {
    private String name;
    private int age;
  
    public String getName() {
        return name;
    }
  
    public void setName(String name) {
        this.name = name;
    }
  
    public int getAge() {
        return age;
    }
  
    public void setAge(int age) {
        this.age = age;
    }
  
    @Override
    public boolean equals(Object obj) {
        return EqualsBuilder.reflectionEquals(this, obj);
    }
  
    @Override
    public int hashCode() {
        return HashCodeBuilder.reflectionHashCode(this);
    }
}

--

?

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package com.osc.demo;
 import java.util.ArrayList; import java.util.List;
 public class Test {
    public static void main(String[] args) {
        Student studentOne = new Student();
        studentOne.setName("张柏芝");
        studentOne.setAge(34);
        List listOne = new ArrayList();
        listOne.add(studentOne);
        Teacher teacherOne = new Teacher();
        teacherOne.setName("陈冠希");
        teacherOne.setAge(33);
        teacherOne.setStudent(listOne);
  
        Student studentTwo = new Student();
        studentTwo.setName("张柏芝");
        studentTwo.setAge(34);
        List listTwo = new ArrayList();
        listTwo.add(studentTwo);
        Teacher teacherTwo = new Teacher();
        teacherTwo.setName("陈冠希");
        teacherTwo.setAge(33);
        teacherTwo.setStudent(listTwo);
  
        System.out.println(teacherOne == teacherTwo);
        System.out.println(teacherOne.equals(teacherTwo));
    }
}

--

false
true