package yang;????public class hellowworld{? ?????public static void main(String[] args) {????????????System.out.println("hobby"); }????}這里面System.out.println("hobby");括號里有引號，我把引號去了，顯示錯誤；但如果給hobby賦值加入 ????????????????????????String?hobby="我愛慕課網(wǎng)"; System.out.print(hobby);這時候括號內(nèi)不需要引號，反而加入引號，顯示錯誤