关于ArrayList中对象按照属性进行分类(属性相同的对象放入新的arrayList里面)

关于ArrayList中对象按照属性进行分类(属性相同的对象放入新的arrayList里面)

package com.zotn.test;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.Map;
import java.util.TreeMap;
public class ArrayListType {
public Map<String,ArrayList>  sort(ArrayList list){
TreeMap tm=new TreeMap();
for(int i=0;i<list.size();i++){
SupplierBean s=(SupplierBean)list.get(i);
if(tm.containsKey(s.getBukrs())){//
ArrayList l11=(ArrayList)tm.get(s.getBukrs());
l11.add(s);
}else{
ArrayList tem=new ArrayList();
tem.add(s);
tm.put(s.getBukrs(), tem);
}

}
return tm;
}
public static void main(String[] args) throws IOException{
ArrayList list=new ArrayList();
SupplierBean s1=new SupplierBean();
s1.setBukrs("1000");
s1.setName1("总1");

SupplierBean s2=new SupplierBean();
s2.setBukrs("1000");
s2.setName1("总2");
SupplierBean s3=new SupplierBean();
s3.setBukrs("1100");
s3.setName1("分1");
SupplierBean s4=new SupplierBean();
s4.setBukrs("1100");
s4.setName1("分2");

SupplierBean s5=new SupplierBean();
s5.setBukrs("4300");
s5.setName1("山东1");
list.add(s1);
list.add(s2);
list.add(s3);
list.add(s4);
list.add(s5);

Map<String,ArrayList> ss =new ArrayListType().sort(list);
Iterator it = ss.keySet().iterator();
while(it.hasNext()){
String key = (String)it.next();
System.out.print("\n"+key+":");
ArrayList list1 = ss.get(key);
for(int i=0; i<list1.size(); i++){
SupplierBean sb = (SupplierBean)list1.get(i);
System.out.print("   "+sb.getName1());
}

}
}
}

package com.zotn.test;

public class SupplierBean {

private String bukrs;

private String lifnr;

private String name1;

private String bkzkp;
public String getBukrs() {
return bukrs;
}
public void setBukrs(String bukrs) {
this.bukrs = bukrs;
}
public String getLifnr() {
return lifnr;
}
public void setLifnr(String lifnr) {
this.lifnr = lifnr;
}
public String getName1() {
return name1;
}
public void setName1(String name1) {
this.name1 = name1;
}
public String getBkzkp() {
return bkzkp;
}
public void setBkzkp(String bkzkp) {
this.bkzkp = bkzkp;
}
}