Arraylist中可以具有任意值的多个字符串的连接

import java.util.ArrayList;

public class ArrayListStringConcatenation {
    public static void main(String[] args) {
        ArrayList<String> strings = new ArrayList<>();
        strings.add("Hello");
        strings.add("World");
        strings.add("!");

        String result = "";
        for (String str : strings) {
            result += str;
        }

        System.out.println(result);
    }
}

import java.util.ArrayList;

public class ArrayListStringConcatenation {
    public static void main(String[] args) {
        ArrayList<String> strings = new ArrayList<>();
        strings.add("Hello");
        strings.add("World");
        strings.add("!");

        StringBuilder sb = new StringBuilder();
        for (String str : strings) {
            sb.append(str);
        }

        String result = sb.toString();
        System.out.println(result);
    }
}