// One practice

package Collection;

import java.util.ArrayList;

import java.util.Iterator;

// 去除 ArrayList 集合中的重复元素

public class ArrayListTest

{

	public static void sop(Object obj)

	{

		System.out.println(obj);

	}

	public static void main(String[] args)

	{

		ArrayList<String> arrayList = new ArrayList<String>();

		arrayList.add("java01");

		arrayList.add("java02");

		arrayList.add("java03");

		arrayList.add("java04");

		arrayList.add("java01");

		arrayList.add("java02");

		arrayList.add("java03");

		sop(arrayList);

		arrayList = singleElement(arrayList);

		sop(arrayList);

	}

	public static ArrayList<String> singleElement(ArrayList<String> al)

	{

		// 定义一个临时容器

		ArrayList newAl = new ArrayList();

		Iterator iterator = al.iterator();

		while (iterator.hasNext())

		{

			Object obj = iterator.next();

			if (!newAl.contains(obj))

			{

				newAl.add(obj);

			}

		}

		return newAl;

	}

}

// Practice Two

package Collection;

import java.util.ArrayList;

import java.util.Iterator;

// 将自定义对象作为元素存到 ArrayList 集合中，并去除重复元素

// 比如：存人对象。同姓名同年龄，视为同一个人。为重复元素

/*

1.对人描述，将数据封装进入对象

2.定义容器，将人存入

3.取出

List集合判断元素是否相同，依据是元素的 equals 方法。

*/

class Person

{

	private String name;

	private int age;

	Person(String name,int age)

	{

		this.name = name;

		this.age = age;

	}

	// 重写 equals 方法

	public boolean equals(Object obj)

	{

		if (!(obj instanceof Person))

		{

			return false;

		}

		Person person = (Person)obj;

		return this.name.equals(person.name) && this.age == person.age;

	}

	public String getname()

	{

		return name;

	}

	public int getage()

	{

		return age;

	}

}

public class ArrayListTest2

{

	public static void sop(Object obj)

	{

		System.out.println(obj);

	}

	public static void main(String[] args)

	{

		ArrayList al = new ArrayList();

		al.add(new Person("Xp01", 30));

		al.add(new Person("Xp02", 35));

		al.add(new Person("Xp02", 35));

		al.add(new Person("Xp03", 37));

		al.add(new Person("Xp04", 35));

		al.add(new Person("Xp04", 35));

		al = singleElement(al);

		Iterator it = al.iterator();

		while (it.hasNext())

		{

			Person p = (Person)it.next();

			sop(p.getname()+"::"+p.getage());

		}

	}

	public static ArrayList singleElement(ArrayList<String> al)

	{

		// 定义一个临时容器

		ArrayList newAl = new ArrayList();

		Iterator iterator = al.iterator();

		while (iterator.hasNext())

		{

			Object obj = iterator.next();

			if (!newAl.contains(obj))

			{

				newAl.add(obj);

			}

		}

		return newAl;

	}

}