兩個list取並集

因爲要用一個模糊查詢autocomplete，然後默認可以查代碼和名稱，所以在數據庫查詢的時候必須進行like 兩列，也許這個方式不對，但在獲取了兩個list進行合併的時候遇到了問題，因爲list中存的是類，所以還有不少麻煩。廢話不多說，直接貼代碼。

                String param = "%"+aparam+"%";
		String sql1 = "select c.* from tp_examkc c where c.kcdm like ? and rownum <= 10  order by c.kcdm " ;
		String sql2 =" select c.* from tp_examkc c where c.kcmc like ? and rownum <= 10  order by c.kcdm";
		List<ExamKkkc> list1 = this.qeryList(sql1, param, ExamKkkc.class);
		List<ExamKkkc> list2 = this.qeryList(sql2, param, ExamKkkc.class);

如果list中存在 的都是簡單的string或者int等類型，處理非常簡單，

public static List mergeList(List list1, List list2){
		list1.removeAll(list2);
		list2.addAll(list1);
		
		return list2;
	}

但是因爲list中存儲的是類，這個時候要在 存的類中做文章了，我是走了邪道。

package com.oumasoft.tp.entity;

import java.io.Serializable;

/**
 * @date 2017-06-20 09:07:54
 * @author zq.big
 *
 */
public class ExamKkkc implements Serializable {

	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;

	private String id;
	
	private String kcdm;
	
	private String kcmc;

	private String zklb;
	
	private String kksj_i;
	
	private String remark;
	
	private String kcxf;
	
	private String verify;

	public String getId() {
		return id;
	}

	public void setId(String id) {
		this.id = id;
	}

	public String getKcdm() {
		return kcdm;
	}

	public void setKcdm(String kcdm) {
		this.kcdm = kcdm;
	}

	public String getZklb() {
		return zklb;
	}

	public void setZklb(String zklb) {
		this.zklb = zklb;
	}

	public String getKksj_i() {
		return kksj_i;
	}

	public void setKksj_i(String kksj_i) {
		this.kksj_i = kksj_i;
	}

	public String getRemark() {
		return remark;
	}

	public void setRemark(String remark) {
		this.remark = remark;
	}

	public String getKcmc() {
		return kcmc;
	}

	public void setKcmc(String kcmc) {
		this.kcmc = kcmc;
	}

	public static long getSerialversionuid() {
		return serialVersionUID;
	}

	public String getKcxf() {
		return kcxf;
	}

	public void setKcxf(String kcxf) {
		this.kcxf = kcxf;
	}

	public String getVerify() {
		return verify;
	}

	public void setVerify(String verify) {
		this.verify = verify;
	}
	
	public ExamKkkc(){}

	public ExamKkkc(String id, String kcdm, String kcmc, String zklb,
			String kksj_i, String remark, String kcxf, String verify) {
		super();
		this.id = id;
		this.kcdm = kcdm;
		this.kcmc = kcmc;
		this.zklb = zklb;
		this.kksj_i = kksj_i;
		this.remark = remark;
		this.kcxf = kcxf;
		this.verify = verify;
	}//在這裏覆寫了新的equals和hashcode的方法。
       @Override  
	public boolean equals(Object obj) {  
	ExamKkkc e=(ExamKkkc)obj;   
	return id.equals(e.id) && kcmc.equals(e.kcmc);   
	} 
	@Override
	public int hashCode() {  
	String in = id + kcmc;  
	return in.hashCode();  
	} 
		
}

覆寫這兩個方法後，在dao層就可以做如下處理了。 簡單粗暴。

List<ExamKkkc> list3 = new ArrayList<ExamKkkc>();
		list1.addAll(list2);
		Set set1 = new HashSet(list1);
		list3.addAll(set1);
		return list3;