Get Values from List and insert into String

Question

I have a string where i need to place the values from the list,But when i for loop the list i will get one value at a iteration.

public class Test2 {

    public static void main(String[] args) throws ParseException, JSONException {

        List<String> value=new ArrayList<String>();
        value.add("RAM");
        value.add("26");
        value.add("INDIA");

        for(int i=0;i<value.size();i++){
        String template="My name is "+value.get(i) +"  age is "+value.get(i)+" country is"+value.get(i);
        System.out.println(value.get(i));
        }
    o/p should be like this:    String ="My name is +"+RAM +"age is "+26+"Country is"+INDIA;
    }
}

What makes you think a for loop would be a good solution here? — Thomas, Apr 07 '17 at 10:43

score 1 · Answer 1 · answered Apr 07 '17 at 10:42

You don't need a for loop, simply access the elements using index of the List as shown below:

System.out.println("My name is "+value.get(0) +
  "  age is "+value.get(1)+" country is"+value.get(2));

Also, I suggest you use StringBuilder for appending strings which is a best practice, as shown below:

StringBuilder output = new StringBuilder();
        output.append("My name is ").append(value.get(0)).append("  age is ").
            append(value.get(1)).append(" country is ").append(value.get(2));
System.out.println(output.toString());

score 0 · Answer 2 · answered Apr 07 '17 at 10:49

You do not need any loop! Also you do not need any array list I am sorry but I could fully understand what exactly you need but I this code will help you:

    List<String> value = new ArrayList<String>();
    value.add("RAM");
    value.add("26");
    value.add("INDIA");

    String template = "My name is " + value.get(0) + "  age is " + value.get(1) + " country is" + value.get(2);
    System.out.println(template);

    // o/p should be like this: String ="My name is +"+RAM +"age is
    // "+26+"Country is"+INDIA;

score 0 · Accepted Answer · edited May 23 '17 at 10:30

What's happening is that in each iteration you're taking the i-th element of the list and you're placing it in all the positions of your String template.

As @javaguy says, there's no need to use a for loop if you only have those three items in your list, and another solution is to use String.format:

String template = "My name is %s age is %s country is %s";
String output = String.format(template, value.get(0), value.get(1), value.get(2));

It's probably a bit slower (interesting discussion here) but performances don't seem to be relevant in your case, so the choiche between the two options would be mostly based on personal taste.

Get Values from List and insert into String

3 Answers3