使用EqualsBuilder和HashCodeBuilder重写equals、hashCode方法

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> 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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?

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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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?

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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)); } }

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false
true