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问题

Which of the followi


Which of the following fragments might cause errors?()    

  • A String s = "Gone with the wind";String t = " good ";String k = s + t;
  • B String s = "Gone with the wind";String t;t = s[3] + "one";
  • C String s = "Gone with the wind";String standard = s.toUpperCase();
  • D String s = "home directory";String t = s - "directory";
参考答案
参考解析:

A:String类型可以直接使用+进行连接运算。 B:String是一种Object,而不是简单的字符数组,不能使用下标运算符取其值的某个元素,错误。 C:toUpperCase()方法是String对象的一个方法,作用是将字符串的内容全部转换为大写并返回转换后的结果(String类型)。    D:String类型不能进行减(-)运算,错误。

分类:SCJP程序员认证考试题库
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