java之------ 异常处理

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import java.util.*;import java.text.*;class ChineseDate{  private Calendar aday;  public ChineseDate(int year, int month,int day)throws MyDateException{  //this.aday= new Calendar();//不行，因为Calendar是抽象类  //this();  this.aday = Calendar.getInstance(); //※※※  this.set(year,month,day);  }  public ChineseDate(){  this.aday = Calendar.getInstance();  }  public void set(int year, int month, int day)throws MyDateException{//抛异常  //进行业务逻辑的合法性处理  if(year<=0 || year>2500){  throw new MyDateException("年份错误，有效年份为:0~2500。");  }  if(month<=0 || month>12){  throw new MyDateException("月份错误!");  }  if(day<=0 || day>daysOfMonth(year,month) ){  throw new MyDateException("日期错误");  }    this.aday.set(year,month-1,day); //※※※  }    public static boolean isLeapYear( int year ){     boolean boo=year%400==0 || year%100!=0&&year%4==0;     return boo;   }   public boolean isLeapYear(){     return this.isLeapYear(aday.get(Calendar.YEAR));   }      public static int daysOfMonth(int year,int month){     switch(month){       case 1: case 3: case 5: case 7: case 8: case 10: case 12: return 31;       case 4: case 6: case 9: case 11: return 30;       case 2: return isLeapYear(year)? 29:28;       default: return 0;     }   }   /* //※※※   public int daysOfMonth(){     return daysOfMonth(aday.get(Calendar.YEAR),aday.get(Calendar.MONTH));   }   */    public String toString(){  return new SimpleDateFormat("yyyy年MM月dd日 EEEEE a hh 时 mm 分 ss 秒").format( new Date(aday.getTimeInMillis()) );  }     public static void main(String args[]){      try{//接异常 ，异常处理  System.out.println( new ChineseDate(2015,1,23) );  }catch(MyDateException e){  System.out.println("aaaa----:"+e.toString() );  if(e.toString().equals("年份错误，有效年份为:0~2500。")){      System.out.println("发现年份出错的异常，进行相应处理....");  }  if(e.toString().equals("月份错误!")){      System.out.println("发现月份出错的异常，进行相应处理....");  }  if(e.toString().equals("日期错误")){      System.out.println("发现日期出错的异常，进行相应处理....");  }  }catch(Exception e){  e.printStackTrace();    }    System.out.println("我很好...");    }}
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