题目1:
创建Person接口(即“人”),它有setData()和getData()方法对“人”属性name、sex和birthday赋值和获得这些属性组成的字符串信息。创建类Student实现Person接口,并对自己的“学生”属性的成员变量sID、speciality设置值和获得它们值所组成的字符串信息。
代码:
People.java(接口)package com.interfaces;public interface People {public void setData(String name,String sex,String birthday);public String getData();}Student.java(实现接口的类)package com.interfaces.impl; import com.interfaces.People; public class Student implements People { private String name; private String sex; private String birthday; private String sID="2014"; private String speciality="写代码"; @Override public void setData(String name, String sex, String birthday) { // TODO Auto-generated method stub this.name=name; this.sex=sex; this.birthday=birthday; } @Override public String getData() { // TODO Auto-generated method stub return "名字: " + name + ",性別: " + sex + ",生日: " + birthday + ",ID: " + sID + ",专长: " +speciality; } public static void main(String[] args) { // TODO Auto-generated method stub People Yantai=new Student(); Yantai.setData("海哥", "男", "2017年2月19日"); System.out.println(Yantai.getData()); } }
题目2:
编写程序,求柱体的体积:
(1)、为柱体的底面设计一个接口Geometry,包含计算面积的方法getArea();
(2)、为柱体设计类pillar,要求:
a)有两个成员变量,底面和高度。底面是任何可以计算面积的几何形状。
b)实现构造方法,对成员变量赋值。
c)包含成员方法,计算柱体pillar的体积。
(3)、编写测试类圆形类、矩形类实现Geometry接口,编写测试类Test,分别用圆形、矩形作为柱体的底面,并计算其体积。
代码:
Geometry.java(接口)package com.interfaces;public interface Geometry {public double getArea();}Test.java(接口实现类)package com.interfaces.impl; import com.interfaces.Geometry; public class Test { public static void main(String[] args) { // TODO Auto-generated method stub Pillar pillar; Geometry bottom; bottom = new Rect(10, 5); //接口实现方法 pillar = new Pillar(bottom, 5); System.out.println("矩形底的柱体的体积:" + pillar.Volume()); bottom = new Circle(5); pillar = new Pillar(bottom, 5); System.out.println("圆形底的柱体的体积:" + pillar.Volume()); } class Pillar{ Geometry bottom; double height; public Pillar(Geometry bottom, double height){ this.bottom=bottom; this.height=height; } public double Volume(){ return bottom.getArea()*this.height; } } class Circle implements Geometry{ double radius; public Circle(double radius){ this.radius = radius; } public double getArea() { // TODO Auto-generated method stub return Math.PI*this.radius*this.radius; } } class Rect implements Geometry{ double wide,length; public Rect(double wide, double length){ this.wide = wide; this.length = length; } public double getArea() { return wide*length; } } }
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