黑马程序员技术交流社区
标题:
一个java问题,大神帮帮忙
[打印本页]
作者:
ash
时间:
2015-11-14 09:52
标题:
一个java问题,大神帮帮忙
public class CountLettersInArray
{
public static void main(String[] args)
{
char [] chars = createArray() ;
System.out.println("The lowercase letters are:");
displayArray(chars) ;
int [] counts = countLetters(chars) ;
System.out.println() ;
System.out.println("The occurrences of each letter are:") ;
displayCounts(counts);
}
public static char[] createArray()
{
char[] chars = new char[100] ;
for (int i = 0;i<chars.length ;i++ )
chars[i] = RandomCharacter.getRandomLowerCaseLetter() ;
return chars;
}
public static void displayArray(char[] chars)
{
for (int i = 0;i<chars.length ;i++ )
{
if ((i + 1)%20==0)
System.out.println(chars[i] + " ") ;
else
System.out.print(chars[i] + " ") ;
}
}
public static int[] countLetters(char[] chars)
{
int[] counts = new int[26] ;
for (int i = 0 ;i<chars.length ;i++ )
counts[chars[i] - 'a']++ ;
return counts ;
}
public static void displayCounts(int[] counts)
{
for (int i=0;i<counts.length ;i++ )
{
if ((i + 1)%10 == 0)
System.out.println(counts[i] + " "
+ (char)(i + 'a')) ;
else
System.out.print(counts[i] + " "
+ (char)(i + 'a') + " ") ;
}
}
}
程序运行不出来，帮帮忙
作者:
Phy_zhang
时间:
2015-11-14 19:18
这样没层次感地去看,真的很累,望楼主改进
作者:
许佳鑫
时间:
2015-11-14 21:26
二楼很对，下次贴代码可以在编辑区的代码区域添加，可读性更好（如果你是真心想让别人去为你解答的话
）我对你原代码改了一处，有注释，你看下
public class Test {
public static void main(String[] args) {
char[] chars = createArray();
System.out.println("The lowercase letters are:");
displayArray(chars);
int[] counts = countLetters(chars);
System.out.println();
System.out.println("The occurrences of each letter are:");
displayCounts(counts);
}
public static char[] createArray() {
char[] chars = new char[100];
for (int i = 0; i < chars.length; i++)
//chars[i] = RandomCharacter.getRandomLowerCaseLetter();
chars[i] ='i';//将你原程序的这一行改为我这一行，发现程序可正常跑起来，然后你自己看能不能发现问题，不能再问
return chars;
}
public static void displayArray(char[] chars) {
for (int i = 0; i < chars.length; i++) {
if ((i + 1) % 20 == 0)
System.out.println(chars[i] + " ");
else
System.out.print(chars[i] + " ");
}
}
public static int[] countLetters(char[] chars) {
int[] counts = new int[26];
for (int i = 0; i < chars.length; i++)
counts[chars[i] - 'a']++;
return counts;
}
public static void displayCounts(int[] counts) {
for (int i = 0; i < counts.length; i++) {
if ((i + 1) % 10 == 0)
System.out.println(counts[i] + " " + (char) (i + 'a'));
else
System.out.print(counts[i] + " " + (char) (i + 'a') + " ");
}
}
}
复制代码
欢迎光临 黑马程序员技术交流社区 (http://bbs.itheima.com/)
黑马程序员IT技术论坛 X3.2
）我对你原代码改了一处，有注释，你看下