字典的异常

package zuizhong;

public class Dict {
    DicItem[]dict=new DicItem[5];
    class DicItem{
    String en;
    String ch;
    public DicItem(String en, String ch) {
        super();
        this.en = en;
        this.ch = ch;
    }

}

public Dict(){
    dict[0]=new DicItem("book", "图书");
    dict[1]=new DicItem("a", "一个");
    dict[2]=new DicItem("she", "她");
    dict[3]=new DicItem("he", "他");
    dict[4]=new DicItem("hello", "你好");

}
    public String trans(String en) throws Exception{
        for(DicItem e:dict){
            if(en.equals(e.en)){
                return e.ch;
            }
        }
        throw new Exception("这个单词不存在");

    }

}

package zuizhong;

public class TestDic {

    public static void main(String[] args)  {
Dict d=new Dict();
try {
    String cn=d.trans("d");
    System.out.println(cn);
} catch (Exception e) {
    System.out.println("此单词不存在，请重新输入");
}
    }

}