Java 的Frame和Panel的区别下面哪个语句是正确的【 】:A.Object o = new Button(“A”); B.Button b = new Object(“B”);C.Panel p = new Frame(); D.Frame f = new Panel();
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![Java 的Frame和Panel的区别下面哪个语句是正确的【 】:A.Object o = new Button(“A”); B.Button b = new Object(“B”);C.Panel p = new Frame(); D.Frame f = new Panel();](/uploads/image/z/10650949-61-9.jpg?t=Java+%E7%9A%84Frame%E5%92%8CPanel%E7%9A%84%E5%8C%BA%E5%88%AB%E4%B8%8B%E9%9D%A2%E5%93%AA%E4%B8%AA%E8%AF%AD%E5%8F%A5%E6%98%AF%E6%AD%A3%E7%A1%AE%E7%9A%84%E3%80%90+%E3%80%91%EF%BC%9AA.Object+o+%3D+new+Button%28%E2%80%9CA%E2%80%9D%29%3B+B.Button+b+%3D+new+Object%28%E2%80%9CB%E2%80%9D%29%3BC.Panel+p+%3D+new+Frame%28%29%3B+D.Frame+f+%3D+new+Panel%28%29%3B)
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Java 的Frame和Panel的区别下面哪个语句是正确的【 】:A.Object o = new Button(“A”); B.Button b = new Object(“B”);C.Panel p = new Frame(); D.Frame f = new Panel();
Java 的Frame和Panel的区别
下面哪个语句是正确的【 】:
A.Object o = new Button(“A”); B.Button b = new Object(“B”);
C.Panel p = new Frame(); D.Frame f = new Panel();
Java 的Frame和Panel的区别下面哪个语句是正确的【 】:A.Object o = new Button(“A”); B.Button b = new Object(“B”);C.Panel p = new Frame(); D.Frame f = new Panel();
A正确,因为Button类是Object的子类,A的使用方式,称Object 的对象o是子类对象的上传型对象.(就好比说,老虎是是动物,一个道理)
而Frame和Panel的区别,他俩都是容器,最本质的区别是,窗口(Frame对象)会默认的被系统添加到显示屏上,所以,不允许将一个窗口添加到另一个容器中去,而Panel没这个限制.