如何将arraylist转换为字符串? [英] how to convert arraylist into string?

问题描述

我是Java的初学者.在我的代码中，我有一个arraylist，我想完全输出为String.为此，我已经编写了这段代码.

I am beginner in java. In my code i have a arraylist and i want to output completely as a String. for this i have write this code.

package factorytest;

import java.util.ArrayList;
import java.util.List;

public class MatchingWord {

    public static void main(String[] args) {

        List <String> myList = new ArrayList<String>();
        myList.add("hello");
        myList.add("first");
        myList.add("second");
        myList.add("third");
        myList.add("fourth");

        // 1st approach
        String listString = "";

        for (String s : myList)
        {
            listString += s + "\t";
        }
System.out.println(listString);
    }

}

我的输出是

hello   first   second  third   fourth  

我不希望最后一个元素后面的最后一个\ t.我怎么能做到这一点.

i don't want the last \t after the last element. how can i achieve this.

推荐答案

一个解决方案不使用 for-each 循环，您可以执行以下操作:

One solution is not using for-each loop, you can do the following:

int i;
for(i = 0;i < myList.size() - 1;i++) {
    listString += myList.get(i) + "\t";
}
listString += myList.get(i);

我建议您使用 StringBuilder 代替+.

其他解决方案:

• 构造完字符串后将其修剪.
• 使用 Joiner .
• ...

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