2016-06-11 134 views
0

我正在开发一个听写程序,其中我尝试将学生输入的文本与正确的文本进行比较,但编译时出现错误,这对我没有任何意义。Java长度方法错误

CODE:

String[] list_answer = exercise_english_1.answer.split("\\s+"); 
String[] list_responce = exercise_english_1.response.split("\\s+"); 
ArrayList<String> list_error = new ArrayList<String>(); 

for(int i = 0; i < list_answer.length(); ++i) { 
    if (list_responce[i].equals(list_answer[i])) 
     exercise_english_1_statistics.score += (double) 1/list_answer.length(); 
    else 
     list_error.add(list_responce[i]); 
} 

错误:

C:\Users\?????\OneDrive\Java\Project\Prototype\Prototype.java:71: error: cannot find symbol 
         for(int i = 0; i < list_answer.length(); ++i) { 
                ^
    symbol: method length() 
    location: variable list_answer of type String[] 
C:\Users\?????\OneDrive\Java\Project\Prototype\Prototype.java:73: error: cannot find symbol 
             exercise_english_1_statistics.score += (double) 1/list_answer.length(); 

    symbol: method length() 
    location: variable list_answer of type String[] 
C:\Users\?????\OneDrive\Java\Project\Prototype\Prototype.java:208: error: cannot find symbol 
         for(int i = 0; i < list_answer.length(); ++i) { 
                ^
    symbol: method length() 
    location: variable list_answer of type String[] 
C:\Users\?????\OneDrive\Java\Project\Prototype\Prototype.java:210: error: cannot find symbol 
             exercise_french_1_statistics.score += (double) 1/list_answer.length(); 
                            ^
    symbol: method length() 
    location: variable list_answer of type String[] 
4 errors 

PS:对不起,我的英语不好,这不是我的母语...

+3

数组具有'length'字段,而不是'length()'方法。 – Pshemo

+0

也读:[长度和长度()在java中](http://stackoverflow.com/questions/1965500/length-and-length-in-java) – Pshemo

+0

但我有其他类似的数组在我的代码和编译并执行得很好。 –

回答

1

阵列不有一个length()方法,他们有一个length的公共成员:

for(int i = 0; i < list_answer.length; ++i) { 
    // Here (note: no()) -----^