你的代碼應(yīng)該沒問題，那就只有才編譯和運(yùn)行這兩方面找問題了，編譯用的是javac，格式j(luò)avac ?x.java

運(yùn)行用的是java,格式j(luò)ava x,編譯需要帶后綴名;運(yùn)行的時候不需要帶后綴名，帶了就會出現(xiàn)找不到或無法加載主類的錯誤提示

//OfficeAble.java

interface?OfficeAble
{
????public?void?start();
}

//OfficeBetter.java

class?OfficeBetter
{
?????????public?static?void?main(String[]?args)
????{
??????try{
????????????????//動態(tài)加載類，在運(yùn)行時刻加載
??????????Class?c=Class.forName(args[0]);
??????????//通過類類型，創(chuàng)建該類對象
??????????OfficeAble?oa=(OfficeAble)c.newInstance();
??????????oa.start();
????????}catch(Exception?e){
????????????e.printStackTrace();
????????}
????}
}

//Word.java

class?Word?implements?OfficeAble
{
????public?void?start()
????{
????????System.out.println("word...start....");
????}
}

//Excel.java

class?Excel?implements?OfficeAble
{
????public?void?start()
????{
????????System.out.println("Excel...start....");
????}
}

代碼呢？