按照题目要求编写的用javaBean规范设计的学生类Student的Java程序如下
需要创建user.java.test包,把Student.java文件和Test.java文件放入包中,编译Student.java文件并且编译运行Test.java文件得到运行结果
Student.java文件代码如下
package user.java.test
import java.io.Serializable
public class Student implements Serializable{
private static final long serialVersionUID = 1L
private String no
private String name
private double score
public Student(){}
public Student(String no,String name,double score){
this.no=no
this.name=name
this.score=score
}
public String getNo(){ return no}
public void setNo(String no){ this.no=no}
public String getName(){ return name}
public void setName(String name){ this.name=name}
public double getScore(){ return score}
public void setScore(double score){ this.score=score}
public String toString(){
return "学号:"+no+",姓名:"+name+",成绩:"+score
}
public static double getAvg(Student[] sArray){
double sum=0,avg
for(int i=0i<sArray.lengthi++){
sum=sum+sArray[i].getScore()
}
avg=sum/sArray.length
return avg
}
}
Test.java文件代码如下
package user.java.test
public class Test{
public static void main(String[] args){
Student[] sArray=new Student[5]
sArray[0]=new Student("001","张三",89.5)
sArray[1]=new Student("002","李四",82.5)
sArray[2]=new Student("003","王五",93)
sArray[3]=new Student("004","赵六",73.5)
sArray[4]=new Student("005","孙七",66)
System.out.println("这些学生的平均分:"+Student.getAvg(sArray))
for(int i=0i<sArray.lengthi++){
System.out.println(sArray[i].toString())
}
}
}
按照题目要求编写的圆,圆锥和测试类的Java程序如下
Test.java文件内容如下
class Circle{
private double r
private String color
public Circle(double r){
this.r=r
}
public double area(){
return Math.PI*r*r
}
public double perimeter(){
return Math.PI*2*r
}
public double getR(){
return this.r
}
public void setR(double r){
this.r=r
}
public String getColor(){
return this.color
}
public void setColor(String color){
this.color=color
}
public String toString(){
return "圆的半径为"+r+",颜色为"+color
}
}
class Cone{
private Circle c
private double h
private String color
public Cone(Circle c,double h){
this.c=c
this.h=h
}
public double volume(){
return 1.0/3*c.area()*h
}
public Circle getCircle(){
return this.c
}
public void setCircle(Circle c){
this.c=c
}
public double getH(){
return this.h
}
public void setH(double h){
this.h=h
}
public String getColor(){
return this.color
}
public void setColor(String color){
this.color=color
}
public String toString(){
return "圆锥的底面积为"+c.area()+",高为"+h+",颜色为"+color
}
}
public class Test{
public static void main(String[] args){
Circle circle1=new Circle(2.5)
circle1.setColor("红色")
System.out.println(circle1.toString())
System.out.println("圆的面积为"+circle1.area())
System.out.println("圆的周长为"+circle1.perimeter())
Cone circlar1=new Cone(circle1,2.7)
circlar1.setColor("蓝色")
System.out.println(circlar1.toString())
System.out.println("圆锥的体积为"+circlar1.volume())
}
}
