选择正确的语句填在下列程序的横线处，使程序正常运行。 package ch1; import java. io. *; import j ava. util. *; class C45 implements Seritizable ______Public Thread t = new Thread(new T45(), 't'); public intcnt = 0; public C45() { t. start ( ) class T45 implements Runnable public int[] a = new int[4]; public void run() { for(int i - 0; i ＜ 4; i++) { a[i] - i +4; } } } public class ex45 { static String fileName = 'ch1//file45.txt'; public static void main(String[] args) throws Exception { C45 bj = new C45 (); FileOutputStream fos = new FileOutputStream(fileName); ObjectOutputStream os = new ObjectOutputStream(fos); oos. writeObject (obj); oos.clese (); fos.close (); System. out, println (obj . toString ( ) ); } }