求教大神解答，请看第一行代码的提示错误
//若是按书名查找编写其实现的方法
private static String bookname() //为啥在这一行总是提示该方法要返回一个字符型
{ //抛出异常必须引用 throws Exception
String name1;
String[] books ={"高数","语文 ","数学","政治","地理","汇编语言","C语言","遥感"};
name1 = con1.next(); //获取输入的字符型
for(int i = 0 ; i < books.length; i++){
if (books[i].equals(name1)){//判断如果两个字符串相等
return books[i];
}
}
//throw new Exception("图书不存在！");
}
