匿名内部类使用final参数的问题

 package test;
public class TestFinal 
{
	//只有定义成 final User user 才不会报错为什么？
	public void test( User user)
	{
		(new Thread()
			{ 
				public void run()
					{   
						System.out.println("user.name-->"+user.name);
					}
			} 
		).start();  
	}
	public static void main(String[] args) 
	{
		User user=new User();
		user.setId(007);
		user.setName("zhaoyang");
		
		TestFinal testFinal=new TestFinal();
		testFinal.test(user);	
	}
}


class  User
{
	String name=null;
	int id;
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	
}