实验7. 8 .9

实验九：异常的抛出，捕获并处理 
package jiangcai;
  
  public class Throwerror {
  public static void main(String[] args) throws IllegalArgumentException
  {    Point point1=new Point (3,1);
       Point point2=new Point (6,2);
       Point point3=new Point (9,3);
       new Rectangle(point1, -12,3);
       new Triangle(point1,point2,point3);
      Point[] point= {point1,point2};
      new Polygon(point);
     }
 
 }
 
 class Point
 {   public Point() {};
     public int x;
     public int y;
     public Point(int x,int y)
    {   this.x=x;
        this.y=y;
         
         if(x<0||y<0)
             throw new IllegalArgumentException("Point中无效参数异常");
        }
     }
 class Rectangle extends Point
{
     public int length,width;
     public Rectangle(Point point1,int length,int width) {
         this.length=length;
        this.width=width;
        if(length<0||width<0)
             throw new IllegalArgumentException("Rectangle无效参数异常");
     }
     }
 class Triangle extends Point 
 {
     
     public Triangle(Point point1,Point point2,Point point3) {
        if(point1.x/point1.y==point2.x/point2.y&&point2.x/point2.y==point3.x/point3.y)
            throw new IllegalArgumentException("Triangle无效参数异常");
        }
     }
 
 class Polygon extends Point
 {   int i=0;
     public Polygon(Point[] points)
     { i=points.length;
       if(i<=2)
         throw new IllegalArgumentException("Polygon无效参数异常");
         }
 
     }

实验八：接口与实现接口的类

package 项目;
interface Area
{
public abstract double area();
}
interface Volume
{
public abstract double volume();
}
public class yuanzhui extends Object implements Area,Volume
{
int height,raduis,length;
public yuanzhui(int height,int raduis,int length)
{
this.height=height;
this.raduis=raduis;
this.length=length;
}
public double area()
{
return (Math.PI*raduis*length+Math.PI*raduis*2);
}
public double volume()
{
return height*Math.PI*raduis*2/3;
}
public static double max(yuanzhui X,yuanzhui Y)
{
System.out.print("体积较大圆锥体体积为：");
if(X.volume()>Y.volume())
return X.volume();
else
return Y.volume();
}

public static void main(String[] args) {
yuanzhui YZ=new yuanzhui(3,4,5);
yuanzhui yz=new yuanzhui(4,5,6);
System.out.println("圆锥1表面积为："+YZ.area());
System.out.println("圆锥2表面积为："+yz.area());
System.out.println("圆锥1体积为："+YZ.volume());
System.out.println("圆锥2体积为："+yz.volume());
System.out.println("圆锥体积较大的为："+Math.max(yz.volume(),YZ.volume()));
}
}

结果： 

圆锥1表面积为：87.96459430051421
圆锥2表面积为：125.66370614359172
圆锥1体积为：25.132741228718345
圆锥2体积为：41.88790204786391
圆锥体积较大的为：41.88790204786391

实验七：类的多态

public class person1 {
 public String name;
 public String birthday;
 public String grade;
 public String gender;
 public String province;
 public String city;
 public static int count=0;

 public person1(String name,String birthday,String grade,String gender,String province,String city) {
  this.name=name;
  this.birthday=birthday;
  this.grade=grade;
  this.gender=gender;
  this.province=province;
  this.city=city;
  count++;
  // TODO 自动生成的构造函数存根
 }
 public static void main(String[] args) {
  Student stud1=new Student("李明","1998-1-1","2017","男","青海省","西宁市","计算机","网络工程",88,89);
  stud1.show1();
  stud1.Setnumber();
  Student stud2=new Student("张三","1999-11-1","2018","男","四川省","成都市","计算机","物联网工程",98,96);
  stud2.show1();
  stud2.Setnumber();
  Student stud3=new Student("王二","2000-10-1","2017","女","辽宁省","大连市","计算机","计算机科学与技术",78,84);
  stud3.show1();
  stud3.Setnumber();
  Student stud4=new Student("张四","1997-12-1","2017","女","青海省","海东市","计算机","网络工程",74,84);
  stud4.show1();
  stud4.Setnumber();
  stud1.searchname("张");
  stud2.searchname("张");
  stud3.searchname("张");
  stud1.searchplace("青海省");
  stud2.searchplace("青海省");
  stud3.searchplace("青海省");
  stud1.Sum();
  stud2.Sum();
  stud3.Sum();
  stud4.Sum();
  
 }
}
 class Student extends person1
{
 public String department,speciality;
 public int math;
 public int computer;
 public static int sum=0;
 public static int total=0; 
 public static int sum1=0;
 public static int total1=0;
 public static int sum2=0;
 public static int total2=0;
 public Student(String name,String birthday,String grade,String gender,String province,String city,String department,String speciality,int math,int computer)
 {
  super(name,birthday,grade,gender,province,city);
  this.department=department;
  this.speciality=speciality;
  this.math=math;
  this.computer=computer;
 }
 public void show1()
 {
  System.out.println("\n");
  System.out.println("基本信息为：");
  System.out.println("姓名为："+this.name);
  System.out.println("生日为："+this.birthday);
  System.out.println("性别为："+this.gender);
  System.out.println("省份为："+this.province);
  System.out.println("城市为："+this.city);
  System.out.println("系为："+this.department);
  System.out.println("专业为："+this.speciality);
  System.out.println("数学成绩为："+this.math);
  System.out.println("计算机成绩为："+this.computer);
 }
 public void Setnumber()
 {
  System.out.print("学号为：");
  if(this.speciality=="网络工程")
   System.out.println(this.grade+"33111"+this.count);
  else if(this.speciality=="物联网工程")
   System.out.println(this.grade+"33112"+this.count);
  else if(this.speciality=="计算机科学与技术")
   System.out.println(this.grade+"33113"+this.count);
  
 }
 public void searchname(String nam)
 {
  int i=1;
  i=name.indexOf(nam);
  if(i!=-1) {
   System.out.println("\n");
   System.out.println("输入查找姓名信息的查找结果为:");
   System.out.println(nam);
   System.out.println(name+" "+birthday+" "+grade+" "+gender+" "+province+" "+city+" "+department+" "+speciality+" "+math+" "+computer);
  }
 }
 public void searchplace(String place)
 {
  int i=1;
  i=province.indexOf(place);
  if(i!=-1) {
   System.out.println("\n");
   System.out.println("输入查找地名信息的查找结果为:");
   System.out.println(place);
   System.out.println(name+" "+birthday+" "+grade+" "+gender+" "+province+" "+city+" "+department+" "+speciality+" "+math+" "+computer);
  }
 }
 public void Sum()
 {   
  
  System.out.println("\n");
  if(this.speciality=="网络工程") {
   System.out.println("经汇总后的网络工程班的数学成绩和计算机成绩分别为：");
   this.sum=this.sum+this.math;
   this.total=this.total+this.computer;
   System.out.println(this.sum);
   System.out.println(this.total);
  }
  else if(this.speciality=="物联网工程"){
   System.out.println("经汇总后的物联网工程班的数学成绩和计算机成绩分别为：");
   this.sum1=this.sum1+this.math;
   this.total1=this.total1+this.computer;
   System.out.println(this.sum1);
   System.out.println(this.total1);
  }
  else if(this.speciality=="计算机科学与技术"){
   System.out.println("经汇总后的计算机科学班的数学成绩和计算机成绩分别为：");
   this.sum2=this.sum2+this.math;
   this.total2=this.total2+this.computer;
   System.out.println(this.sum2);
   System.out.println(this.total2);
  } 
 }
}

 

 结果：

 

转载于:https://www.cnblogs.com/jcdz/p/10927619.html