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（）

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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> 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<Student> getStudent() {
        return
student;
    }
  
    public
void
setStudent(List<Student> 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<Student> listOne = new
ArrayList<Student>();
        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<Student> listTwo = new
ArrayList<Student>();
        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