java string string, int and arraylist conversion

String to  ArrayList
first cut the string according to a certain character, convert it to a string array,
and then use the asList method of Arrays to convert the array to List

public class test1 {
    public static void main(String[] args)  {
        //string 转 ArrayList
        String str1 = "a,b,c";
        ArrayList<String> list = 
        new ArrayList<String>(Arrays.asList(str1.split(",")));
        System.out.println(list);
    }
}

ArrayList to string

public class test1 {
    public static void main(String[] args)  {
        //ArrayList 转 string
        ArrayList<String> list = new ArrayList<String>();

        list.add("a");
        list.add("b");
        list.add("c");

        System.out.println(list);//[a, b, c]

        String list_str = StringUtils.join(list,",");

        System.out.println(list_str);//a,b,c
    }
}

  

If it is an int to an arraylist, convert the int to a string first

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How to convert a string to an arraylist in java