去掉對象中重複數據

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

public class ArrayListTest1
{
	public static void main(String[] args)
	{
		ArrayList aList = new ArrayList();
		aList.add(new Person("李四", 30));
		aList.add(new Person("王三", 32));
		aList.add(new Person("李四", 31));
		aList.add(new Person("李四", 30));
		singArray(aList);
		Iterator it = aList.iterator();
		while (it.hasNext())
		{
			Object object = it.next();
			Person person = (Person) object;
			System.out.println(person.getName() + "...." + person.getAge());
		}
	}

	public static ArrayList singArray(ArrayList al)
	{
		ArrayList arrayList = new ArrayList();
		Iterator integer = al.iterator();
		while (integer.hasNext())
		{
			Object obj = integer.next();
			if (!arrayList.contains(obj))
			{
				arrayList.add(obj);
			}
		}
		return arrayList;
	}
}

class Person
{
	private int age;
	private String name;

	Person(String name, int age)
	{
		this.name = name;
		this.age = age;
	}

	public boolean equals(Object obj)
	{
		if (!(obj instanceof Person))
			return false;
		Person perso = (Person) obj;
		return this.name.equals(perso.name) && this.age == age;

	}

	public int getAge()
	{
		return age;
	}

	public void setAge(int age)
	{
		this.age = age;
	}

	public String getName()
	{
		return name;
	}

	public void setName(String name)
	{
		this.name = name;
	}

}

  當看到這段視頻，收穫很大。雖然理解了，但是如果要自己寫，我想肯定是寫不出來的。

對於類中的方法，不是全都一樣的，看來還是需要常常看看API了。

 

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