这程序该怎么改正，求指导。
// **********************************************************
// Count.java
//
// This program reads in strings (phrases) and counts the
// number of blank characters and certain other letters
// in the phrase.
// **********************************************************

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,i; // the length of the phrase
char ch; // an individual character in the string

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: ");
phrase = scan.nextLine();
length = phrase.length();

// Initialize counts
countBlank = 0;

// a for loop to go through the string character by character
for(i = 0;i <= length ;i++)
{
if(phrase.charAt(i) == ' ') {
countBlank++;
}
}
System.out.println (countBlank);
}
}

[解决办法]

Java code

for(i = 0;i < length ;i++)  {  if(phrase.charAt(i) == ' ') {  countBlank++;  }  }
[解决办法]
上楼正确从0开始  或者for(i=0;i<=length-1;i++)
[解决办法]
java的下标是从0 --> （长度 -1) ;