成员内部类做字典

package zidian;

public class Dict {
    //词库最多可存储100个单词
    DictItem [] di=new DictItem[100];
    int size=0;//实际的单词数
public void add(String en,String cn){
    di[size++]=new DictItem(en, cn);
    
}
    
    public String trans(String en){
    for(int i=0;i<size;i++){
        if(en.equals(di[i].en)){
            return di[i].cn;
        }
    }
    return null;
    }
    
    
    
    class DictItem{
        String en;
        String cn;
        public DictItem(String en, String cn) {
            super();
            this.en = en;
            this.cn = cn;
        }
        
        
    }
    
    
}

package zidian;

public class Test {

    public static void main(String[] args) {
        Dict dict=new Dict();
        dict.add("book", "图书");
        dict.add("button", "按钮");
        dict.add("people", "人");
        
        
System.out.println(dict.trans("book"));
System.out.println(dict.trans("a"));
    }
    
    
    
}