使用 SetUniqueList 构造不重复的元素列表

SetUniqueList 是 Commons-Collections 项目中的一个类，用来构造不重复的元素列表

package com.ysstech.test.list.po;

import java.util.Comparator;

public class Person  {
private String name;
private String age;

public Person(String name, String age) {
super();
this.name = name;
this.age = age;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}

@Override
public boolean equals(Object obj) {
Person person = (Person) obj;
if(person.getAge().equals(age)&&person.getName().equals(name)){
return true;
}
return false;
}

@Override
public int hashCode() {
// TODO Auto-generated method stub
return 123;
}
}

package com.ysstech.test.list;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import org.apache.commons.collections.list.SetUniqueList;

import com.ysstech.test.list.po.Person;

import sun.awt.PeerEvent;

public class ListTest {
public static void main(String[] args) {
List<Person> list =SetUniqueList.decorate(new ArrayList<Person>());

Set<Person> set = new HashSet<Person>();

Person person1 = new Person("ssk","1");
Person person2 = new Person("ssk","1");

set.add(person1);
set.add(person2);

for (Person person : set) {
System.out.println(person);
}

list.add(person1);
list.add(person2);
//System.out.println();
for (Person person : list) {
System.out.println(person);
}

}
}

打印结果

com.ysstech.test.list.po.Person@7b（次为set结合）

com.ysstech.test.list.po.Person@7b（此为list集合）

这里面最主要的就是Person对象中的 equals方法 和hashCode方法的重写