这怎么回事？？？

[pp_dll]

class www
{
//定义域，一个二围的字符数组
static String[][] dictionary={
{"三人行必有我师","爱","中国","数字","圣诞快乐","你好","狗","猫","三","我","网页","网站","傻子","不行","头","肯德基","程序","数学","计算机","花"},
{"three men must have my teacher","love","china","number","Merry Christmas","Hello","Dog","Cat","three","I","web","web site","foolishman","No way","head","KFC","programe","Mathematics","computer","flower"}
};
/************定义英译汉方法**********/
public static String engtoCh(String s)
{
//逐个比较dictionary[1][i]中的字符串
//然后找到则返回结果，否则返回空字符串
for(int i=0;i<20;i++)
{
if(dictionary[1][i]==s)
{return dictionary[0][i];}
else
{return null;}
}
}
public static void main(String args[])
{

System.out.println(engtoCh("love"));
}
}
//**********************************************************
//这个类为什么为什么有：missing return statment错误啊？？？？？？？
//**************

[fireflyqt]

要在外面写return语句！
for(int i=0;i<20;i++)
{
if(dictionary[1][i]==s)
{return dictionary[0][i];}
else
{return null;}
}
这么写有什么必要吗？

[pp_dll]

哦，我知道了原来是要这样的
public String engtoCh(String s)
{
String str="";
//逐个比较dictionary[1][i]中的字符串
//然后找到则返回结果，否则返回空字符串
for(int i=0;i<20;i++)
{
if(dictionary[1][i]==s)
{
str=dictionary[0][i];
break;
}
else
{
str= null;
break;
}
}
return str;
}

[pp_dll]

语法问题，return 语句只有一个

[pp_dll]

或者
for(int i=0;i<20;i++)
{
if(dictionary[1][i]==s)
{return dictionary[0][i];
break;
}
else
{return null;
break;
}
}