在每一项之后插入逗号，而不是最后一项。
在每一项之后插入逗号，而不是最后一项。
提问于 2014-02-25 00:32:40
我在java中有一个程序，当你输入一个句子，程序告诉你有多少回文单词，并输出这些单词。然而，当我输出单词时，我似乎无法在每个输出之后得到一个逗号。例如，如果我输入"Abba正在运行到该雷达“，它会输出有2个回文，回文是"Abba雷达”。不过，我希望它输出回文为"Abba，雷达“。无论我怎么做，我都可以得到“阿巴雷达”或“阿巴，雷达”。任何帮助都将不胜感激。
密码
package strings;
import javax.swing.*;
public class Palindrome2 {
public static void main(String[] args) {
String word = JOptionPane.showInputDialog("Words that are the same forwards and backwards are called palindromes.\nThis program determines if the words are palindromes.\n\nEnter a sentence(do not include a punctuation mark):");
String newWord[] = word.split(" ");
String palindromeWords = "";
int count = 0;
for (int i = 0; i < newWord.length; i++) {
String result = new StringBuffer(newWord[i]).reverse().toString();
if (newWord[i].toLowerCase().equals(result.toLowerCase())) {
count++;
palindromeWords = palindromeWords + " " + newWord[i];
}
}
JOptionPane.showMessageDialog(null, "There are " + count + " palindromes in this sentence");
if (count != 0) {
JOptionPane.showMessageDialog(null, "The palindromes are:\n" + palindromeWords);
} else {
JOptionPane.showMessageDialog(null, "There isn't any palindromes.");
}
}
}回答 3
Stack Overflow用户
发布于 2014-02-25 00:36:46
只需将代码修改为：
for (int i = 0; i < newWord.length; i++) {
String result = new StringBuffer(newWord[i]).reverse().toString();
if (newWord[i].toLowerCase().equals(result.toLowerCase())) {
count++;
palindromeWords = palindromeWords + newWord[i] + ",";
}
}在for循环之后，删除最后一个逗号的substring：
palindromeWords = palindromeWords.substring(0,palindromeWords.length()-1);Stack Overflow用户
发布于 2014-02-25 00:39:03
代码也可以是
if (newWord[i].toLowerCase().equals(result.toLowerCase())) {
count++;
if (count > 1)
{
palindromeWords += ", ";
}
palindromeWords += newWord[i];
}Stack Overflow用户
发布于 2014-02-25 00:54:13
第一个词被发现后，逗号在新词之前.
public static void main(String[] args) {
String word = JOptionPane.showInputDialog("Words that are the same forwards and backwards are called palindromes.\nThis program determines if the words are palindromes.\n\nEnter a sentence(do not include a punctuation mark):");
String newWord[] = word.split(" ");
StringBuffer palindromeWords = new StringBuffer();
int count = 0;
for (int i = 0; i < newWord.length; i++) {
String result = new StringBuffer(newWord[i]).reverse().toString();
if (newWord[i].toLowerCase().equals(result.toLowerCase())) {
if (count > 0) {
palindromeWords.append(",");
}
palindromeWords.append(newWord[i]);
count++;
}
}
JOptionPane.showMessageDialog(null, "There are " + count + " palindromes in this sentence");
if (count != 0) {
JOptionPane.showMessageDialog(null, "The palindromes are:\n" + palindromeWords.toString());
} else {
JOptionPane.showMessageDialog(null, "There isn't any palindromes.");
}
}因此，我将回文单词修改为StringBuffer，并在追加操作后移动count++。希望这能有所帮助！
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/22002188
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