无限循环,不会以while循环结束

Question

好的,所以我写了这个程序,它将计算一定的字母和空格,我想要它做的是让用户继续输入短语,它继续循环,直到用户进入退出终止.我很难看到在哪里放置while循环.我知道我应该在while循环下嵌套所有循环,当我这样做时,程序进入无限循环.

import java.util.Scanner;

public class Count
{
  public static void main (String[] args)
  {
      String phrase;    // a string of characters
      int countBlank;   // the number of blanks (spaces) in the phrase 
      int length;       // the length of the phrase
      char ch;         // an individual character in the string
        int countA=0,countE=0,countS=0,countT=0;


    Scanner scan = new Scanner(System.in);
      // Print a program header
      System.out.println ();
      System.out.println ("Character Counter");
      System.out.println ();

      // Read in a string and find its length
      System.out.print ("Enter a sentence or phrase or enter (Quit) to quit: ");
        phrase = scan.nextLine();
while(!phrase.equalsIgnoreCase ("Quit"))
{
        length = phrase.length();

            // Initialize counts
            countBlank = 0;

        // a for loop to go through the string character by character

            for (int i = 0; i < phrase.length(); i++) 
        {
            if(phrase.charAt(i) == ' ') countBlank++;

            switch(ch=phrase.charAt(i)) 
            {
            case 'a':
            case 'A': countA++;
            break;

            case 'e':
            case 'E': countE++;
            break;

            case 's':
            case 'S': countS++;
            break;

            case 't':
            case 'T': countT++;
            break;

        }
     }


      // Print the results
      System.out.println ();
      System.out.println ("Number of blank spaces: " + countBlank);
        System.out.println ("Number of a: " + countA);
        System.out.println ("Number of e: " + countE);
        System.out.println ("Number of s: " + countS);
        System.out.println ("Number of t: " + countT);
      System.out.println ();

  }
 }
}

Answer 1

在while循环中,你永远不会读下一行.你需要添加

phrase = scan.nextLine();

'for'循环后,但仍然在'while'循环内.否则,短语将始终是您阅读的第一件事.