泛型，擦除

public class Test<T> {
	private Class<T> kind;
	public Test(Class<T> kind){
		this.kind = kind;
		System.out.println(kind);
	}
	
	@SuppressWarnings("unchecked")
	T[] create(int size){
		System.out.println(kind);
		return (T[]) Array.newInstance(kind, size);
	}
	
	public Class<T> getKind(){
		return kind;
	}
	
	public static void main(String[] args){
		Test<String> t = new Test<String>(String.class);
		String[] ss = t.create(5);
		System.out.println(t.getKind());
		for(String s : ss){
			System.out.println(s);
		}
	}
}