我想分离单词并在一行之间加上连字符(-)将它们打印出来。我已经编写了以下代码,但它只显示最后一个单词,后跟一个连字符,即输出为胡萝卜-。我不明白为什么以及要进行哪些更改才能获得所需的输出?
public class SeparatingWords {
public static void main(String[] args) {
String str = "apple banana carrot";
System.out.println(separatingWords(str));
}
public static String separatingWords(String str) {
String[] words = str.split(" ");
String result = null;
for (int i = 0; i < words.length; i++) {
result=words[i]+"-";
}
return result;
}
}
答案 0 :(得分:4)
为什么不直接调用split
并串联字符串,为什么不能直接直接调用replaceAll
来实现目标。这将使您的代码变得简单。
String result = str.replaceAll(" ", "-");
下面是您的示例修改代码。希望这会有所帮助
public class Sample {
public static void main(String[] args) {
String str = "apple banana carrot";
System.out.println(separatingWords(str));
}
public static String separatingWords(String str) {
String result = str.replaceAll(" ", "-");
return result;
}
}
如果您要根据方法内的要求执行任何其他操作,则下面的方法适用于您。如@Moler所建议,添加了+=
并初始化了result
对象
public static String separatingWords(String str) {
String[] words = str.split(" ");
String result = ""; // Defaulted the result
for (int i = 0; i < words.length-1; i++) {
result += words[i] + "-"; // Added a +=
}
result += words[words.length - 1];
return result;
}
答案 1 :(得分:1)
public class SeparatingWords
{
public static void main(String[] args)
{
String str="apple banana carrot";
System.out.println(separatingWords(str));
}
public static String separatingWords(String str)
{
String[] words=str.split(" ");
String result="";
for(int i=0;i<words.length;i++)
{
result += words[i]+"-";
}
return result;
}
}
答案 2 :(得分:0)
尝试以下代码:
public class SeparatingWords
{
public static void main(String[] args)
{
String str="apple banana carrot";
System.out.println(separatingWords(str));
}
public static String separatingWords(String str)
{
String[] words=str.split(" ");
String result=words[0];
for(int i=1;i<words.length;i++)
{
result=result+"-"+words[i];
}
return result;
}
}
答案 3 :(得分:0)
您可以使用s StringBuilder
,在单词后面加上一个连音,在最后一个单词上,只需添加单词:
public class SeparatingWords {
public static void main(String[] args) {
String str = "apple banana carrot";
System.out.println(separatingWords(str));
}
public static String separatingWords(String str) {
String[] words = str.split(" ");
StringBuilder resultBuilder = new StringBuilder();
for (int i = 0; i < words.length; i++) {
resultBuilder.append(words[i]);
if (i != words.length - 1) {
resultBuilder.append("-");
}
}
return resultBuilder.toString();
}
}
答案 4 :(得分:0)
String[] words = str.split(" ");
// perform operations on individual words
return String.join("-", words);