在字符串列表中添加空格?
Adding a whitespace inside a List of strings?
我有一个 ArrayList
字符串,其中包含不同的单词。我想要做的是在每个单词之间的列表中添加空格。
我的代码确实打印出带有空格的元素,但仅作为打印输出,我需要将空格包含在列表中,以便我可以将其用作值。
示例输入:Hi, how are you?
,结果:Hi,", " ", "are", " ", "you?
public void getCipher(ArrayList<String> list) {
String regex = "\", \" " + "\", " + "\"";
for (String input : list) {
String newResult = input + regex;
System.out.print(newResult);
}
}
迭代列表并使用新字符串更新其中的每个字符串,如下所示:
public List<String> updateStrings(List<String> list) {
String regex = "\", \" " + "\", " + "\"";
for (int i = 0; i < list.size(); i++) {
list.set(i, list.get(i) + regex);
}
return list;
}
import java.util.ArrayList;
import java.util.List;
public class Main {
public static void main(String[] args) {
// Test
List<String> list = new ArrayList<>(List.of("Hello", "World"));
System.out.println(list);
System.out.println(updateStrings(list));
}
static List<String> updateStrings(List<String> list) {
String regex = "\", \" " + "\", " + "\"";
for (int i = 0; i < list.size(); i++) {
list.set(i, list.get(i) + regex);
}
return list;
}
}
输出:
[Hello, World]
[Hello", " ", ", World", " ", "]
要在列表中的其他项目之间添加空格,我会创建一个新列表并遍历“旧”列表,如下所示:
public ArrayList<String> getCipher(ArrayList<String> list) {
ArrayList<String> result = new ArrayList<>();
String regex = "\", \" " + "\", "+ "\"";
for (String input : list) {
result.add(input + regex);
result.add(" ");
}
return result;
}
您可以将列表设置为此方法的结果,例如
list = getCipher(list)
您可以使用 flatMap
方法在列表中的元素之间插入空格:
public static void main(String[] args) {
List<String> list = List.of("Hi,", "how", "are", "you?");
System.out.println(appendSpaces(list));
}
public static List<String> appendSpaces(List<String> list) {
return list.stream()
// append a space before each word
.flatMap(str -> Stream.of(" ", str))
// skip first space
.skip(1)
// return list
.collect(Collectors.toList());
}
输出:
[Hi,, , how, , are, , you?]
创意截图:
另请参阅:How to add characters in the middle of a word in an arraylist in java?
我有一个 ArrayList
字符串,其中包含不同的单词。我想要做的是在每个单词之间的列表中添加空格。
我的代码确实打印出带有空格的元素,但仅作为打印输出,我需要将空格包含在列表中,以便我可以将其用作值。
示例输入:Hi, how are you?
,结果:Hi,", " ", "are", " ", "you?
public void getCipher(ArrayList<String> list) {
String regex = "\", \" " + "\", " + "\"";
for (String input : list) {
String newResult = input + regex;
System.out.print(newResult);
}
}
迭代列表并使用新字符串更新其中的每个字符串,如下所示:
public List<String> updateStrings(List<String> list) {
String regex = "\", \" " + "\", " + "\"";
for (int i = 0; i < list.size(); i++) {
list.set(i, list.get(i) + regex);
}
return list;
}
import java.util.ArrayList;
import java.util.List;
public class Main {
public static void main(String[] args) {
// Test
List<String> list = new ArrayList<>(List.of("Hello", "World"));
System.out.println(list);
System.out.println(updateStrings(list));
}
static List<String> updateStrings(List<String> list) {
String regex = "\", \" " + "\", " + "\"";
for (int i = 0; i < list.size(); i++) {
list.set(i, list.get(i) + regex);
}
return list;
}
}
输出:
[Hello, World]
[Hello", " ", ", World", " ", "]
要在列表中的其他项目之间添加空格,我会创建一个新列表并遍历“旧”列表,如下所示:
public ArrayList<String> getCipher(ArrayList<String> list) {
ArrayList<String> result = new ArrayList<>();
String regex = "\", \" " + "\", "+ "\"";
for (String input : list) {
result.add(input + regex);
result.add(" ");
}
return result;
}
您可以将列表设置为此方法的结果,例如
list = getCipher(list)
您可以使用 flatMap
方法在列表中的元素之间插入空格:
public static void main(String[] args) {
List<String> list = List.of("Hi,", "how", "are", "you?");
System.out.println(appendSpaces(list));
}
public static List<String> appendSpaces(List<String> list) {
return list.stream()
// append a space before each word
.flatMap(str -> Stream.of(" ", str))
// skip first space
.skip(1)
// return list
.collect(Collectors.toList());
}
输出:
[Hi,, , how, , are, , you?]
创意截图:
另请参阅:How to add characters in the middle of a word in an arraylist in java?