Java 程序交换一个句子中单词的第一个和最后一个字符
原文:https://www . geesforgeks . org/Java-program-swap-first-last-characters-words-句子/
编写一个 Java 程序来交换句子中单词的第一个和最后一个字符，就像例子中提到的那样？
示例:
Input : geeks for geeks
Output :seekg rof seekg
方法:如示例中所述，我们必须替换单词的第一个和最后一个字符，并保持其余字母不变。
- First, we will use the toCharArray () method to create a Char array of a given string.
- Now we use the for loop to iterate over the char array.
- In the for loop, we declare a variable whose value depends on I.
- Whenever we find an alphabet, we increase the value of I, and whenever we reach a space, we will exchange between the first and last characters of the word in front of the space.
class SwapFirstLastCharacters {
static String count(String str)
{
// Create an equivalent char array
// of given string
char[] ch = str.toCharArray();
for (int i = 0; i < ch.length; i++) {
// k stores index of first character
// and i is going to store index of last
// character.
int k = i;
while (i < ch.length && ch[i] != ' ')
i++;
// Swapping
char temp = ch[k];
ch[k] = ch[i - 1];
ch[i - 1] = temp;
// We assume that there is only one space
// between two words.
}
return new String(ch);
}
public static void main(String[] args)
{
String str = "geeks for geeks";
System.out.println(count(str));
}
}
输出:
seekg rof seekg
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