问异常为啥不可以那样

Question

异常的问题
http://expert.csdn.net/Expert/topic/1660/1660081.xml?temp=.185528
那也有编好的部分
今天老师要我加入异常处理
就出现问题了
后面的问题的最关键分数基本上没了才给那点分望原谅
那程序先多态
后异常老师出的
我想别人也做过

Answer 1

package basicjava_study.console;/**
 * <p>Title: This follow is newman's writing</p>
 * <p>Description: I want better writing ,instead of best one!</p>
 * <p>Copyright: Copyright (c) 2002</p>
 * <p>Company: [email protected]</p>
 * @author Newman
 * @version 1.0
 */
import  java.lang.Math.*;
import  java.io.*;class MyException  extends  Exception{
        Tangle tangle;
        boolean flag;//true throw exception
         
         public MyException(){
            super("My Exception");
         }
        
         public MyException(Shape shape){
            this();
            
            if(shape instanceof Tangle){//check: shape is subclass of s(Tangle)
                tangle=(Tangle)shape;
                System.out.println("Tangle found.");
            }
            else{
                System.out.println("Tangle not found.");
                try {
                    throw new NotImplementException();
                }
                catch (NotImplementException ex) {
                    System.err.println("NotImplementException occured: "+ex.getMessage());
                    ex.printStackTrace();
                }
            }
       }
       
       public boolean check(){
         if((tangle.m_dEdge1+tangle.m_dEdge2)<tangle.m_dEdge3)
            this.flag =true;
         if((tangle.m_dEdge2+tangle.m_dEdge3)<tangle.m_dEdge1)
            this.flag =true;
         if((tangle.m_dEdge1+tangle.m_dEdge3)<tangle.m_dEdge2)
            this.flag =true;
         return this.flag ;
       }       public void finalize() {
            this.getchange(); 
        }      public void getchange(){
         if((tangle.m_dEdge1+tangle.m_dEdge2)<tangle.m_dEdge3)  tangle.m_dEdge1=+7;
         if((tangle.m_dEdge2+tangle.m_dEdge3)<tangle.m_dEdge1)  tangle.m_dEdge2=+7;
         if((tangle.m_dEdge1+tangle.m_dEdge3)<tangle.m_dEdge2)  tangle.m_dEdge3=+7;             
       }
} class NotImplementException extends  Exception{
    String msg="Not Implement Exception";
    
    public NotImplementException(){
        super("Not Implement Exception");
    }
    
    public String toString(){
        return msg;
    }
}interface Shape {
    double PI=3.14;
    
    /**
    * 画图
    */
    public void  draw();
    
    /**
    * 面积
    * @return
    */
    public double area();
    
    /**
    * 周长
    * @return
    */
    public double length();
}class Circle implements Shape {
    private int  m_Radius;//半径
    
    Circle(int radius){
        this.m_Radius=radius;
    }    public void draw() {
        System.out.println("Circle.draw()");
    }
    
    public double area(){
        double ara=this.PI*this.m_Radius*this.m_Radius;
        return ara;
    }
    
    public double length() {
        double leng;
        leng=2*this.PI*this.m_Radius;
        return leng;
    }
}/**
 * 三角形
 */
class Triangle implements Shape {
    private  int m_nWeight;//底
    private  int m_nHeight;//高
    
    Triangle(int weight,int height){
        this.m_nWeight=weight;
        this.m_nHeight=height;
    }
    
    public void draw() {
        System.out.println("Triangle.draw()");
    }
    
    public double area() {
        double ara;
        ara=this.m_nHeight*this.m_nWeight/2;
        return ara;
    }
    
    public double length() {
        double leng;
        double sider=Math.pow(this.m_nWeight/2,(double)2)+Math.pow(this.m_nHeight,(double)2);
        sider=Math.sqrt(sider);
        leng=sider*2+this.m_nWeight ;
        return leng;
    }
}/**
 * 混合
 */
class Tangle implements Shape {
       int m_dEdge1,m_dEdge2,m_dEdge3;       Tangle(int edge1,int edge2,int edge3){
                this.m_dEdge1=edge1;
                this.m_dEdge2=edge2;
                this.m_dEdge3=edge3;
       }       public void draw() {
              System.out.println("Tangle.draw()");
       }       public double area() {
               double ara;
               int s=(this.m_dEdge1+this.m_dEdge2+this.m_dEdge3)/2;
               ara=Math.sqrt((double)(s*(s-this.m_dEdge1)*(s-this.m_dEdge2)*(s-this.m_dEdge3)));               
                return ara;
      }      public double length() {
              double leng;
              leng=(double)(this.m_dEdge1+this.m_dEdge2+this.m_dEdge3);              
              return leng;
       }
}
public class Shapes {
    private int m_nType;
    private int m_nNumOfInstance;
    
    public Shapes(){
        this.m_nType =0;
        this.m_nNumOfInstance=3;
    }
    
    public static void main(String[] args) throws MyException{
        Shapes shapes=new Shapes();
        if(args.length==1){
            shapes.m_nType= Integer.parseInt(args[0]);
        }
        else{
            System.out.println("Invalid parameter number ,or NO parameter,\nUse default value (1-"+shapes.m_nNumOfInstance+").");
            return ;
        }        double length=0;
        double area=0;
        Shape  pt[] =new Shape[4];        for(int i=0;i<4;i++){
            int type =((int)(Math.random()*10))%shapes.m_nNumOfInstance;
            //type=2;
            System.out.println("type: "+type);            
            switch (type) {
                case 0:
                    int w = (int) (Math.random() * 8);
                    int h = (int) (Math.random() * 8);                    System.out.println("weight is:" + w);
                    System.out.println("height is:" + h);
                    pt[i] = new Triangle(w, h);
                    pt[i].draw();
                    length = pt[i].length();
                    area = pt[i].area();
                    break;
                case 1:
                    int r = (int) (Math.random() * 8);
                    System.out.println("radius is:" + r);
                    pt[i] = new Circle(r);
                    pt[i].draw();
                    length = pt[i].length();
                    area = pt[i].area();
                    break;
                case 2:
                    try{
                        int e1 = (int) (Math.random() * 8);
                        int e2 = (int) (Math.random() * 8);
                        int e3 = (int) (Math.random() * 8);
                        System.out.println("first edge is:" + e1);
                        System.out.println("second edge is:" + e2);
                        System.out.println("third edge is:" + e3);
                        pt[i] = new Tangle(e1, e2, e3);
                        MyException myex=new MyException(pt[i-1]);
                        if(myex.check()){
                            throw new MyException();
                        }
                    }
                    catch(MyException e){
                        //e.getchange();
                         System.err.println("MyException: "+e.getMessage());
                         e.printStackTrace() ;
                    }
                    
                    
                    pt[i].draw();
                    length = pt[i].length();
                    area = pt[i].area();
                    break;      
                default:
                    length=0;
                    area=0;
                    System.out.println("No this type: "+shapes.m_nType);
                    System.out.println("Use default value (1-"+shapes.m_nNumOfInstance+").");
                    break;              
            }
            System.out.println("the total length is:" + length);
            System.out.println("the total area is:" + area);
        }
    }
}

Answer 2

刚才测试时没有注意，把
                        pt[i] = new Tangle(e1, e2, e3);
                        MyException myex=new MyException(pt[i-1]);
                        if(myex.check()){
                            throw new MyException();
                        }中的MyException myex=new MyException(pt[i-1]);
改为
                        MyException myex=new MyException(pt[i]);

Answer 3

对不起，把你的帖子帖得一塌糊涂。我现在把最后做好的程序给你。package basicjava_study.console;
import  java.lang.Math.*;
import  java.io.*;class MyException  extends  Exception{
        Tangle tangle;
        boolean flag;//true throw exception
         
         public MyException(){
            super("My Exception");
         }
        
         public MyException(Shape shape){
            this();
            
            if(shape instanceof Tangle){//check: shape is subclass of s(Tangle)
                tangle=(Tangle)shape;
                this.getchange() ;
                System.out.println("Tangle found.");
            }
            else{
                System.out.println("Tangle not found.");
                try {
                    throw new NotImplementException();
                }
                catch (NotImplementException ex) {
                    System.err.println("NotImplementException occured: "+ex.getMessage());
                    ex.printStackTrace();
                }
            }
       }
       
       public boolean check(){
         if((tangle.m_dEdge1+tangle.m_dEdge2)<tangle.m_dEdge3)
            this.flag =true;
         if((tangle.m_dEdge2+tangle.m_dEdge3)<tangle.m_dEdge1)
            this.flag =true;
         if((tangle.m_dEdge1+tangle.m_dEdge3)<tangle.m_dEdge2)
            this.flag =true;
         return this.flag ;
       }      public void getchange(){
         if((tangle.m_dEdge1+tangle.m_dEdge2)<tangle.m_dEdge3)  tangle.m_dEdge1=+7;
         if((tangle.m_dEdge2+tangle.m_dEdge3)<tangle.m_dEdge1)  tangle.m_dEdge2=+7;
         if((tangle.m_dEdge1+tangle.m_dEdge3)<tangle.m_dEdge2)  tangle.m_dEdge3=+7;             
       }
} class NotImplementException extends  Exception{
    String msg="Not Implement Exception";
    
    public NotImplementException(){
        super("Not Implement Exception");
    }
    
    public String toString(){
        return msg;
    }
}interface Shape {
    double PI=3.14;
    
    /**
    * 画图
    */
    public void  draw();
    
    /**
    * 面积
    * @return
    */
    public double area();
    
    /**
    * 周长
    * @return
    */
    public double length();
}class Circle implements Shape {
    private int  m_Radius;//半径
    
    Circle(int radius){
        this.m_Radius=radius;
    }    public void draw() {
        System.out.println("Circle.draw()");
    }
    
    public double area(){
        double ara=this.PI*this.m_Radius*this.m_Radius;
        return ara;
    }
    
    public double length() {
        double leng;
        leng=2*this.PI*this.m_Radius;
        return leng;
    }
}/**
 * 三角形
 */
class Triangle implements Shape {
    private  int m_nWeight;//底
    private  int m_nHeight;//高
    
    Triangle(int weight,int height){
        this.m_nWeight=weight;
        this.m_nHeight=height;
    }
    
    public void draw() {
        System.out.println("Triangle.draw()");
    }
    
    public double area() {
        double ara;
        ara=this.m_nHeight*this.m_nWeight/2;
        return ara;
    }
    
    public double length() {
        double leng;
        double sider=Math.pow(this.m_nWeight/2,(double)2)+Math.pow(this.m_nHeight,(double)2);
        sider=Math.sqrt(sider);
        leng=sider*2+this.m_nWeight ;
        return leng;
    }
}/**
 * 混合
 */
class Tangle implements Shape {
       int m_dEdge1,m_dEdge2,m_dEdge3;       Tangle(int edge1,int edge2,int edge3){
                this.m_dEdge1=edge1;
                this.m_dEdge2=edge2;
                this.m_dEdge3=edge3;
       }       public void draw() {
              System.out.println("Tangle.draw()");
       }       public double area() {
               double ara;
               int s=(this.m_dEdge1+this.m_dEdge2+this.m_dEdge3)/2;
               ara=Math.sqrt((double)(s*(s-this.m_dEdge1)*(s-this.m_dEdge2)*(s-this.m_dEdge3)));               
                return ara;
      }      public double length() {
              double leng;
              leng=(double)(this.m_dEdge1+this.m_dEdge2+this.m_dEdge3);              
              return leng;
       }
       
       public String toString(){
            return "first edge is:" +this.m_dEdge1+",second edge is:" +this.m_dEdge2+",third edge is:"+this.m_dEdge3 ;
        }
}
public class Shapes {
    private int m_nType;
    private int m_nNumOfInstance;
    
    public Shapes(){
        this.m_nType =0;
        this.m_nNumOfInstance=3;
    }
    
    public static void main(String[] args) throws MyException{
        Shapes shapes=new Shapes();
        if(args.length==1){
            shapes.m_nType= Integer.parseInt(args[0]);
        }
        else{
            System.out.println("Invalid parameter number ,or NO parameter,\nUse default value (1-"+shapes.m_nNumOfInstance+").");
            return ;
        }        double length=0;
        double area=0;
        Shape  pt[] =new Shape[4];        for(int i=0;i<1;i++){
            int type =((int)(Math.random()*10))%shapes.m_nNumOfInstance;
            type=2;
            System.out.println("type: "+type);            
            switch (type) {
                case 0:
                    int w = (int) (Math.random() * 8);
                    int h = (int) (Math.random() * 8);                    System.out.println("weight is:" + w);
                    System.out.println("height is:" + h);
                    pt[i] = new Triangle(w, h);
                    pt[i].draw();
                    length = pt[i].length();
                    area = pt[i].area();
                    break;
                case 1:
                    int r = (int) (Math.random() * 8);
                    System.out.println("radius is:" + r);
                    pt[i] = new Circle(r);
                    pt[i].draw();
                    length = pt[i].length();
                    area = pt[i].area();
                    break;
                case 2:
                    try{
                        int e1 = (int) (Math.random() * 8);
                        int e2 = (int) (Math.random() * 8);
                        int e3 = (int) (Math.random() * 8);
                        e1=1;e2=4;e3=6;
                        
                        System.out.println("first edge is:" + e1);
                        System.out.println("second edge is:" + e2);
                        System.out.println("third edge is:" + e3);
                        pt[i] = new Tangle(e1, e2, e3);
                        MyException myex=new MyException(pt[i]);
                        if(myex.check()){
                            throw new MyException();
                        }
                    }
                    catch(MyException e){
                        //e.getchange();
                         System.err.println("MyException: "+e.getMessage());
                         e.printStackTrace() ;
                    }
                    
                    System.out.println("DEBUG: "+pt[i].toString());
                    
                    pt[i].draw();
                    length = pt[i].length();
                    area = pt[i].area();
                    break;      
                default:
                    length=0;
                    area=0;
                    System.out.println("No this type: "+shapes.m_nType);
                    System.out.println("Use default value (1-"+shapes.m_nNumOfInstance+").");
                    break;              
            }
            System.out.println("the total length is:" + length);
            System.out.println("the total area is:" + area);
        }
    }
}

Answer 4

main函数中的
type=2;
和
e1=1;e2=4;e3=6;
是测试用的，你把它去掉，就可以用了。如果是测试Tangle类，你就放着吧!