1.主要思路就是根据从写equals 以及 hashCode 方法。

代码如下：

package com.bfd.unibase.modules.dataview.entity;

import org.hibernate.validator.constraints.Length;

import java.util.ArrayList;

import java.util.Date;

import java.util.HashSet;

import java.util.Iterator;

import java.util.List;

import java.util.Set;

import com.fasterxml.jackson.annotation.JsonFormat;

import javax.validation.constraints.NotNull;

import com.bfd.unibase.common.persistence.DataEntity;

/**

* test

* @author kui.peng

* @version 2015-10-22

*/

public class PullThroughAnalysisUser extends DataEntity {

private static final long serialVersionUID = 1L;

private String value1;        //

private String value2;        //

public String getValue1() {

return value1;

}

public void setValue1(String value1) {

this.value1 = value1;

}

public String getValue2() {

return value2;

}

public void setValue2(String value2) {

this.value2 = value2;

}

@Override

public boolean equals(Object obj) {

PullThroughAnalysisUser s=(PullThroughAnalysisUser)obj;

return  value1.equals(s.value1);

// 根据value1 属性去重    }

@Override

public int hashCode() {

String in = value1;

return in.hashCode();

}

public static void main(String[] args) {

List< PullThroughAnalysisUser> listTest = new ArrayList();

PullThroughAnalysisUser pullThroughAnalysisUser = new PullThroughAnalysisUser();

pullThroughAnalysisUser.setValue1("wwww&mmmm");

pullThroughAnalysisUser.setValue2("2222");

PullThroughAnalysisUser pullThroughAnalysisUser2 = new PullThroughAnalysisUser();

pullThroughAnalysisUser2.setValue1("wwww&mmmm");

pullThroughAnalysisUser2.setValue2("3333");

PullThroughAnalysisUser pullThroughAnalysisUser3 = new PullThroughAnalysisUser();

pullThroughAnalysisUser3.setValue1("mmm");

pullThroughAnalysisUser3.setValue2("3333");

listTest.add(pullThroughAnalysisUser3);

listTest.add(pullThroughAnalysisUser2);

listTest.add(pullThroughAnalysisUser);

Set set = new HashSet();

set.addAll(listTest);

Iterator it = set.iterator();

/*while(it.hasNext()){

System.out.println("00000000");

System.out.println(it.next().getValue1());

System.out.println(it.next().getValue2());

}*/

for (PullThroughAnalysisUser student : set) {

System.out.println(student.getValue1()+"-"+student.getValue2());

}

}

}

输入结果：