如果循环不起作用？ 谁能帮我

Question

public class meaingCompare {

    public static void main(String[] args) {
        int cnt = 0;
        String st1, u, st2;
        st2 = "funny";
        int n = 5;
        System.out.println("Enter the string");
        Scanner in=new Scanner(System.in);
        st1 = in.nextLine();
        String[] v = st1.split("\\s+");
        for(int i = 0; i < st1.length(); i++) {
            if(v[i].equalsIgnoreCase(st2))
                cnt++;
        }
        if(cnt>=4)
            System.out.println("  match found");
    }
}

I am just a beginner in java.I want to get the output as match found if the no: of words in the input string match the word funny is greater than 4 but the if loop is not working.

Answer 1

Your stop condition in the for loop is wrong: since you're looping on the array of strings v you should stop when you've reached the last element. Modify:

for(int i=0;i<st1.length();i++)

to:

for(int i=0;i<v.length;i++)

Answer 2

when traversing due to this st1.length() we get ArrayIndexOutofBoundException so compare with array length instead of strings length. This works:

public static void main(String[] args)
    {
        int cnt=0;
        String st1,u,st2;
        st2="funny";
        int n=5;
          System.out.println("Enter the string");
          Scanner in=new Scanner(System.in);
          st1=in.nextLine();
          String[]v=st1.split("\\s+");
          for(int i=0;i<v.length;i++)
          {
              if(v[i].equalsIgnoreCase(st2))
               cnt++; 

           }
            if(cnt>=4)
          System.out.println("  match found");

            }          
}

Answer 3

First of all, there is no such thing as an if loop. You have a for loop.

Your problem is that in your for loop, you check if i is less then the length of the String st1. However you need to check if I is less then the length of the array v . So, change this statement:

for(int i = 0; i < st1.length(); i++)

to this:

for(int i = 0; i < v.length; i++)

Hope this helped.