如何从字符串数组或数组列表创建字符串? [英] how to create a string from string array or arraylist?

问题描述

我如何提取字符串 [] 或 arraylist 中的所有元素，并在它们之间以适当的格式(带有单个空格)组合所有单词并存储在数组中..

how can i extract all the elements in a string [] or arraylist and combine all the words with proper formating(with a single space) between them and store in a array..

String[] a = {"Java", "is", "cool"};

输出:Java 很酷.

Output: Java is cool.

推荐答案

使用 StringBuilder.

String[] strings = {"Java", "is", "cool"};
StringBuilder builder = new StringBuilder();

for (String string : strings) {
    if (builder.length() > 0) {
        builder.append(" ");
    }
    builder.append(string);
}

String string = builder.toString();
System.out.println(string); // Java is cool

或者使用 Apache Commons Lang StringUtils#join().

Or use Apache Commons Lang StringUtils#join().

String[] strings = {"Java", "is", "cool"};
String string = StringUtils.join(strings, ' ');
System.out.println(string); // Java is cool

或者使用Java8的Arrays#stream().

Or use Java8's Arrays#stream().

String[] strings = {"Java", "is", "cool"};
String string = Arrays.stream(strings).collect(Collectors.joining(" "));
System.out.println(string); // Java is cool

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