//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