在进入
try块之前，需要声明变量，以使它们在方法的其余部分范围内：
public static void main() throws FileNotFoundException { File src = null; File des = null; try { src = new File("src.txt"); des = new File("des.txt"); } finally { if (src != null) { System.out.print("After closing files:Size of src.txt:" + src.length() + " Bytest"); } if (des != null) { System.out.println("Size of des.txt:" + des.length() + " Bytes"); } }}
