java创建不定长字符串数组_java – 如何从字符串数组或arraylist创建一个字符串？...

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

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

String string = StringUtils.join(strings, ' ');

System.out.println(string); // Java is cool

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

String string = Arrays.stream(strings).collect(Collectors.joining(" "));

System.out.println(string); // Java is cool