1、創建Person接口(即“人”)，它有setData()和getData()方法對“人”屬性name、sex和birthday賦值和獲得這些屬性組成的字符串信息。創建類Student實現Person接口，并對自己的“學生”屬性的成員變量sID、speciality設置值和獲得它們值所組成的字符串信息。2、編寫程序,求柱體的體積:（1）、為柱體的底面設計一個接口Geometry，包含計算面積的方法getArea();（2）、為柱體設計類pillar，要求：a)有兩個成員變量，底面和高度。底面是任何可以計算面積的幾何形狀。b)實現構造方法，對成員變量賦值。c)包含成員方法，計算柱體pillar的體積。（3）、編寫測試類圓形類、矩形類實現Geometry接口，編寫測試類Test，分別用圓形、矩形作為柱體的底面，并計算其體積。
2 回答
慕沐林林
TA貢獻2016條經驗 獲得超9個贊
第一題有問題：1、創建Person接口(即“人”)，它有setData()和getData()方法對“人”屬性name、sex和birthday賦值和獲得這些屬性組成的字符串信息。
問題是：你說要創建一個人（接口），然后里面有方法對人的屬性進行賦值？這怎么可能呢，接口是沒有成員變量（屬性）的，怎么能賦值？接口里只能有常量。
第二題可以答一下：
package pillar;
public class Pillar { private Geometry buttom;
private double height;
public Pillar() {
// TODO Auto-generated constructor stub
}
public Pillar(Geometry button,double height){
this.buttom = button;
this.height = height;
}
public double getVolume(){
return this.buttom.getArea()*height;
}
public Geometry getButtom() {
return buttom;
}
public void setButtom(Geometry buttom) {
this.buttom = buttom;
}
public double getHeight() {
return height;
}
public void setHeight(double height) {
this.height = height;
}
}
------------------------------------------------類分割線---------------------------------------------------------
package pillar;
public interface Geometry { double getArea();
}
------------------------------------------------類分割線---------------------------------------------------------
package pillar;
public class Circle implements Geometry { private double r;
public Circle() {
// TODO Auto-generated constructor stub
}
public Circle(double r) {
this.r = r;
}
public double getArea() { return Math.PI*r*r;
}
public double getR() {
return r;
}
public void setR(double r) {
this.r = r;
}
}
------------------------------------------------類分割線---------------------------------------------------------
package pillar;
public class Rectangle implements Geometry { private double width;
private double height;
public Rectangle() {
// TODO Auto-generated constructor stub
}
public Rectangle(double width, double height) {
this.width = width;
this.height = height;
}
public double getArea() { return this.width*this.height;
}
public double getWidth() {
return width;
}
public void setWidth(double width) {
this.width = width;
}
public double getHeight() {
return height;
}
public void setHeight(double height) {
this.height = height;
}
}
------------------------------------------------類分割線---------------------------------------------------------
package pillar;
public class TestPillar {
/** * @param args
*/
public static void main(String[] args) {
Circle c = new Circle(5);
Rectangle r = new Rectangle(3,4);
Pillar p1 = new Pillar(c,6);
Pillar p2 = new Pillar(r,6);
System.out.println("圓的體積："+p1.getVolume()+"\t矩形的體積："+p2.getVolume());
}
}
蕪湖不蕪
TA貢獻1796條經驗 獲得超7個贊
第一題
Person接口
import java.util.Date;public interface Person { public void setData(String sID, String speciality, String name, String sex, Date birthday); public String getData(); } |
Student實現類
import java.util.Date;public class Student implements Person { private String sID; private String speciality; private String name; private String sex; private Date birthday; @Override public void setData(String sID, String speciality, String name, String sex, Date birthday) { this.sID = sID; this.speciality = speciality; this.name = name; this.sex = sex; this.birthday = birthday; } @Override public String getData() { return "Student [sID=" + sID + ", speciality=" + speciality + ", name=" + name + ", sex=" + sex + ", birthday=" + birthday + "]"; } } |
添加回答
舉報
0/150
提交
取消