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一个方法在声明时可以使用throw关键字声明要产生的若干个异常。()
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—个应用程序中最多只能有一个窗口。
窗口默认被系统添加到显示器屏幕上，因此不允许将一个窗口添加到其他容器中。
使用GridLayout布局的容器中的单元格大小相同。
中国人与美国人程序模板 请按模板要求，将【代码】替换为Java程序代码。注意填写的程序语句，以分号结尾的一律改为逗号，否则不得分。这是超星系统平台的设置，所以提醒同学们注意！！！！People.javapublic class People {protected double weight,height;public void speakHello() {System.out.println("yayayaya");}public void averageHeight() {height=173;System.out.println("average height:"+height);}public void averageWeight() {weight=70;System.out.println("average weight:"+weight);}}ChinaPeople.javapublic class ChinaPeople extends People {public void speakHello() {System.out.println("您好");}public void averageHeight() {height = 168.78;System.out.println("中国人的平均身高:"+height+" 厘米");}【代码1】 //重写public void averageWeight()方法，输出:"中国人的平均体重:65公斤"public void chinaGongfu() {System.out.println("坐如钟,站如松,睡如弓");}}AmericanPeople.javapublic class AmericanPeople extends People {【代码2】 //重写public void speakHello()方法，输出"How do you do"【代码3】 //重写public void averageHeight()方法，输出"American's average height:176 cm"public void averageWeight() {weight = 75;System.out.println("American's average weight:"+weight+" kg");}public void americanBoxing() {System.out.println("直拳、钩拳、组合拳");}}BeijingPeople.javapublic class BeijingPeople extends ChinaPeople {【代码4】 //重写public void averageHeight()方法, 输出:"北京人的平均身高:172.5厘米"【代码5】 //重写public void averageWeight()方法,输出:"北京人的平均体重:70公斤"public void beijingOpera() {System.out.println("花脸、青衣、花旦和老生");}}Example.javapublic class Example {public static void main(String args[]) {ChinaPeople chinaPeople=new ChinaPeople();AmericanPeople americanPeople=new AmericanPeople();BeijingPeople beijingPeople=new BeijingPeople();chinaPeople.speakHello();americanPeople.speakHello();beijingPeople.speakHello();chinaPeople.averageHeight();americanPeople.averageHeight();beijingPeople.averageHeight();chinaPeople.averageWeight();americanPeople.averageWeight();beijingPeople.averageWeight();chinaPeople.chinaGongfu();americanPeople.americanBoxing();beijingPeople.beijingOpera() ;beijingPeople.chinaGongfu();}}
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