completeEdit()方法抛出IllegalStateException

[youlongsam]

private synchronized void completeEdit(Editor editor, boolean success) throws IOException {
Entry entry = editor.entry;
if (entry.currentEditor != editor) {
throw new IllegalStateException();
}
.......
}
请问在这里IllegalStateException异常是什么问题，如果程序抛出这个异常，应该怎么处理