java - 字符串中的单词数无限循环

Question

谁能告诉我这有什么问题吗？我试图让程序返回字符串中的单词数。它陷入了无限循环......

int NumberNames(String wholename)

{    
    String testname=wholename;

    int numnames=0;

     int posBlank= testname.indexOf(' ');

     while(testname.length()>0)
    {   
       testname = testname.trim();

       testname=testname.substring(posBlank+1,testname.length());

       numnames++;

       System.out.println(testname);
    }    

    return numnames;

}

Answer 1

两个问题。您不会在循环中重置 posBlank 的值，并且如果您传入不带空格的字符串，则子字符串始终只返回整个字符串。你需要解决这两个问题。试试这个:

int NumberNames(String wholename)
{
    String testname=wholename;
    int numnames=1;
    int posBlank= testname.indexOf(' ');

    while(posBlank > 0)
    {   
       testname = testname.trim();
       testname=testname.substring(posBlank+1,testname.length());
       posBlank= testname.indexOf(' ');
       numnames++;
       System.out.println(testname);
    }    

    return numnames;
}