File[] allFiles = dir.listFiles();File[] files1 = null;allFiles 怎样循环赋值给 files1for (int i = 0; i < (allFiles.length/2); i++) { files1[i] = allFiles[i]; }files1[i] = allFiles[i]; 这里有报错
files1 应该怎样写,能给个例子吗