如何从arraylist中删除多余的空格 [英] How to remove extra spaces from arraylist

问题描述

我必须从数据库中检索值并将其添加到 arraylist 中.这是我的代码..

I have to retrieve values from database and add it into arraylist .Here is my code ..

 ArrayList country = new ArrayList();
 strQuery = "Select * from country";

        rs = conexiondb.Consulta(strQuery);

        while (rs.next()) {
            String toc = rs.getString("country");
            country.add(toc);
        }

        out.print(country);
        System.out.println(country);
        out.close();

我已将从数据库中检索到的所有值添加到国家/地区..这是该国家/地区中存在的值..

i have added all the values retrieved from database into country..and here is the values present in the country..

[亚太地区、北美、南美、欧洲]

现在根据我的需要，我必须在每个逗号值之后删除空格并使其像这样..

Now as per my need i have to remove space after each comma values and make it like this..

[亚太地区、北美、南美、欧洲]

请大家帮我解决这个问题..

Please guys help me to solve this..

提前致谢.

推荐答案

你所看到的是 ArrayList 如何格式化它的内容，而不是你的查询结果，尝试类似......

What you are seeing is how ArrayList formats it's contents, not the results of your query, try something like...

for (String name : country) {
    System.out.println("[" + name + "]");
}

检查.如果输出中仍有空格，则可以在从数据库中提取值时以及将它们放入 List

To check. If there are still spaces in the output, then you can use String#trim when you extract the values from the database and before you place them in the List

如果你需要格式化String，你需要提供你自己的机制，例如...

If you need to format the String, you need to provide you own mechanism, for example...

List<String> values = new ArrayList<>();
values.add("APAC");
values.add("North America");
values.add("South America");
values.add("Europe");

System.out.println(values);

StringBuilder sb = new StringBuilder(128);
for (String value : values) {
    if (sb.length() > 0) {
        sb.append(",");
    }
    sb.append(value);
}
sb.insert(0, "[");
sb.append("]");

System.out.println(sb);

哪些输出...

[APAC, North America, South America, Europe]
[APAC,North America,South America,Europe]

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