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package com.nu.test;
import java.math.BigDecimal;
public class JavaBean {
private String name;
private BigDecimal money;
/**
* @return Returns the name.
*/
public String getName() {
return name;
}
/**
* @param name The name to set.
*/
public void setName(String name) {
this.name = name;
}
/**
* @return Returns the money.
*/
public BigDecimal getMoney() {
return money;
}
/**
* @param money The money to set.
*/
public void setMoney(BigDecimal money) {
this.money = money;
}
/**
* Override hashCode and equals is must
*/
/*
* (non-Javadoc)
* @see java.lang.Object#hashCode()
*/
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((name == null) ? 0 : name.hashCode());
return result;
}
public JavaBean() {
super();
}
public JavaBean(String name, BigDecimal money) {
super();
this.name = name;
this.money = money;
}
/*
* (non-Javadoc)
* @see java.lang.Object#equals(java.lang.Object)
*/
@Override
public boolean equals(Object obj) {
if (this == obj) return true;
if (obj == null) return false;
if (getClass() != obj.getClass()) return false;
JavaBean other = (JavaBean) obj;
if (name == null) {
if (other.name != null) return false;
} else if (!name.equals(other.name)) return false;
return true;
}
}
package com.nu.test;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
public class ListTest {
/**
* @param args
*/
public static void main(String[] args) {
List<JavaBean> list = new ArrayList<JavaBean>();
list.add(new JavaBean("来源A", new BigDecimal(100)));
list.add(new JavaBean("来源B", new BigDecimal(200)));
list.add(new JavaBean("来源C", new BigDecimal(300)));
list.add(new JavaBean("来源B", new BigDecimal(6600)));
list.add(new JavaBean("来源A", new BigDecimal(99800)));
//
List<JavaBean> l = groupByListByName(list);
Iterator<JavaBean> it = l.iterator();
while (it.hasNext()) {
JavaBean j = it.next();
System.out.println(j.getName() + "---------" + j.getMoney());
}
}
public static List<JavaBean> groupByListByName(List<JavaBean> orgList) {
List<JavaBean> rst = new ArrayList<JavaBean>();
if (null == orgList || orgList.isEmpty()) {
return rst;
}
for (Iterator<JavaBean> itor = orgList.iterator(); itor.hasNext();) {
JavaBean jab = itor.next();
if (!rst.contains(jab)) {
rst.add(jab);
} else {
JavaBean jbn = rst.get(rst.indexOf(jab));
BigDecimal orgMoney = jbn.getMoney();
BigDecimal newMoney = jab.getMoney();
jbn.setMoney(orgMoney.add(newMoney));
}
}
return rst;
}
}
package cn.zhangao;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
public class ListGroup {
public static void main(String[] args) {
List<JavaBean> list = new ArrayList<JavaBean>();
list.add(new JavaBean("来源A", 100));
list.add(new JavaBean("来源B", 200));
list.add(new JavaBean("来源C", 300));
list.add(new JavaBean("来源B", 6600));
list.add(new JavaBean("来源A", 99800));
List<JavaBean> groupList = getListByGroup(list);
for (JavaBean bean : groupList) {
System.out.print(bean.getGroup() + " ");
System.out.println(bean.getMoney());
}
}
private static List<JavaBean> getListByGroup(List<JavaBean> list) {
List<JavaBean> result = new ArrayList<JavaBean>();
Map<String, Integer> map = new HashMap<String, Integer>();
for (JavaBean bean : list) {
if (map.containsKey(bean.getGroup())) {
map.put(bean.getGroup(), map.get(bean.getGroup()) + bean.getMoney());
} else {
map.put(bean.getGroup(), bean.getMoney());
}
}
for (Entry<String, Integer> entry : map.entrySet()) {
result.add(new JavaBean(entry.getKey(), entry.getValue()));
}
return result;
}
}
class JavaBean {
private String group;
private int money;
public JavaBean() {
}
public JavaBean(String group, int money) {
this.group = group;
this.money = money;
}
public String getGroup() {
return group;
}
public void setGroup(String group) {
this.group = group;
}
public int getMoney() {
return money;
}
public void setMoney(int money) {
this.money = money;
}
}