java141-自定义捕捉异常

//自定义异常类
     public class ArrayElement extends  Exception{
         public static final int MAX_NUM=1000;
         private static final String MESSAGE="集合存储元素过多";
         public ArrayElement(){
         }
         public String getMessage(){
             return MESSAGE+"最大元素限制为"+MAX_NUM;
         }
         public void printStackTrace(){
             System.err.println(MESSAGE);
             super.printStackTrace();
         }
     }定义
    import java.util.ArrayList;
     import java.util.List;
      
     public class UseArray {
         public List<String> StoreElement(int size) throws ArrayElement{
             List<String> list=new ArrayList<>( );
             for(int i=0;i<size;i++){
                 if(i>ArrayElement.MAX_NUM)
                     throw new ArrayElement();
                 list.add("元素"+i);
             }
             return list;
         }
     }测试类
    import java.util.List;
      
     //自定义异常
     public class test84 {
         public static void main(String[] args){
             UseArray uaet=new UseArray();
             try {
                 List<String> list =uaet.StoreElement( 1100 );
                 System.out.println( list.size() );
             }catch (ArrayElement e){
                 System.out.println( e.getMessage() );
                 e.printStackTrace();
             }
         }
     }

运行结果