如何创建一个从字符串数组或ArrayList的字符串？ [英] how to create a string from string array or arraylist?

问题描述

我怎么能提取字符串[]所有元素或ArrayList和适当格式化一个数组中他们和存储之间将所有的单词（用一个空格）。

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是很酷的。

Output: Java is cool.

推荐答案

使用一个<一个href=\"http://download.oracle.com/javase/6/docs/api/java/lang/StringBuilder.html\"><$c$c>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

或者使用的Apache Commons Lang中 <一个href=\"http://commons.apache.org/lang/api-2.5/org/apache/commons/lang/StringUtils.html#join%28java.util.Iterator,%20char%29\"><$c$c>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<一个href=\"https://docs.oracle.com/javase/8/docs/api/java/util/Arrays.html#stream-T:A-\"><$c$c>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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