package com.example.demo0810.util;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import com.example.demo0810.entity.Person;
public class ObjectSort {
//由指定對象集合ObjectList分出重複對象集合ListRepeat 和不重複對象集合ListNoRepeat
public List<Person> ObjectListSortRepeat(List<Person> personList,String repeat){
List listId=new ArrayList<Integer>();
List listIdRepeat=new ArrayList<Integer>();
List listIdNoRepeat=new ArrayList<Integer>();
List<Person> listRepeat=new ArrayList<Person>();
List<Person> listNoRepeat=new ArrayList<Person>();
personList.forEach(p->listId.add(p.getId()));
Collections.sort(listId);
//獲取重複ID
for (int i = 0; i < listId.size(); i++) {
int idNow=(int) listId.get(i);
for (int j = i+1; j < listId.size(); j++) {
if(idNow==(int)listId.get(j)) {
listIdRepeat.add(listId.get(j));
// System.out.print("listId:"+listId.get(j)+" ");
break;
}
}
}
//獲取重複id對於的對象集合ListRepeat
for(int i=0;i<listIdRepeat.size();i++) {
int idNow=(int) listIdRepeat.get(i);
for (Person person : personList) {
if(idNow==person.getId()) {
listRepeat.add(person);
}
}
}
//獲取非重複ID對於的對象集合listNoRepeat
/* HashSet<Person> objectSet= new HashSet<>();
for(Iterator<Person> it=personList.iterator();it.hasNext();) {
objectSet.add(it.next());
}*/
for (int i = 0; i < personList.size(); i++) {
int idNow=(int) personList.get(i).getId();
boolean flag=true;
for (int j = 0; j < listIdRepeat.size(); j++) {
if(idNow==(int)listIdRepeat.get(j)) {
flag=false;
break;
}
}
if(flag==true) {
listNoRepeat.add(personList.get(i));
}
}
if("repeat".equals(repeat)) {
return listRepeat;
}else if("NoRepeat".equals(repeat)) {
return listNoRepeat;
}else {
return null;
}
}
public static void main(String[] args) {
List<Person> personList=new ArrayList<Person>() {
{
add(new Person( 1,"yoko01",20,"ssss"));
add(new Person( 3,"yoko02",20,"ssss"));
add(new Person( 2,"yoko03",20,"ssss"));
add(new Person( 1,"yoko01",20,"ssss"));
add(new Person( 4,"yoko05",20,"ssss"));
}
};
ObjectSort os=new ObjectSort();
System.out.println("==============初始列表================");
personList.forEach(ps->System.out.println(ps));
System.out.println("==============重複列表================");
os.ObjectListSortRepeat(personList, "repeat").forEach(ps->System.out.println(ps.toString()));
System.out.println("==============非重複列表================");
os.ObjectListSortRepeat(personList, "NoRepeat").forEach(ps->System.out.println(ps.toString()));
}
}
輸出結果: