java集合操作

import java.util.ArrayList;
import java.util.Iterator;

/**
 * 集合中添加不重複對象
 */
public class ArrayListPerson {
    public static void main(String[] args) {
        ArrayList<Person> al = new ArrayList<Person>();
        al.add(new Person("lishi01", 20));
        al.add(new Person("lishi02", 21));
        al.add(new Person("lishi03", 22));
        al.add(new Person("lishi02", 21));
        al.add(new Person("lishi04", 23));
        al.add(new Person("lishi04", 23));
        al = singleElement(al);
        Iterator it = al.iterator();
        while (it.hasNext()) {
            Object obj = it.next();
            Person p = (Person) obj;
            System.out.println("name:" + p.getName() + "\tage:" + p.getAge());
        }
        /**
         * 遍歷集合

         for(Iterator iterator = al.iterator(); iterator.hasNext();){
         System.out.println(iterator.next());
         }
         */
    }

    /**
     * 集合去重
     *
     * @param arrayList
     * @return
     */
    public static ArrayList singleElement(ArrayList arrayList) {
        ArrayList newArray = new ArrayList();
        Iterator it = arrayList.iterator();
        while (it.hasNext()) {
            Object obj = it.next();
            if (!newArray.contains(obj)) {
                newArray.add(obj);
            }
        }
        return newArray;
    }
}