I've searched hours for this kind of problem, but I've got no luck.
In Java, I'm try to get this kind of output:
1, 2, 3
(without the use of StringBuilder)
The result I am getting is:
1, 2, 3,
with the code:
for(int i=1; i <= 3; i++){
String output = "";
output += i + ", ";
System.out.print(output);
}
p.s I am not using any arrays for my code.
From Java 8+, this can be achieved using join method.
String.join(",", list)
be careful where you make the final print as you have an accumulator string variable that will serve to make the impression at the end in addition also consider where you declare your variables within the variable will be created for the few times iterate the for, preferably testify before the cycle
use substring takes two parameters start position, end position
String output = "";
for(int i=1; i <= 3; i++){
output += i + ", ";
}
System.out.print(output.substring(0, output.length()-2));
//obtains from 1, 2.3 and omit the, end with the length () - 1 as the final //position
ouput
1, 2, 3
Here is one variation which has only a single ternary expression in the loop to build the output you want.
String output = "";
for (int i=1; i <= 3; i++) {
output += (i > 1) ? ", " + i : i;
}
System.out.print(output);
{ if (i>1) output+=", "; output += i; } ?
if is more straightforward here. Particularly, I don't like that i appears twice - but maybe the ugliness of this is more visible when i is something like "The element with index "+i+" of some list is "+list.get(i), and not so important in this simple case.Though there may be many possible ways to doing this, but the one that I like most is where you don't introduce any unnecessary comparisons within the for loop.
So what you can do is for the first character only, you can directly put it in the string outside the loop, and for all the others, you can append ", <number>" with the original string.
String output = "1";
for(int i=2; i <= 3; i++){
output += ", " + i;
}
System.out.print(output);
Easy:
String output = "1";
for(int i=2; i <= 3; i++){
output += ", " + i;
}
System.out.print(output)
That'll give you
1, 2, 3
No need to complicate the task. This kind of thing comes up all the time. Just treat the first case as a special case.
Try this it is more easier, just check string length and if something in variable append separator:
String output = "";
for(int i=1; i <= 3; i++){
if(output .length>0)
{
output +=',';
}
output += i;
System.out.print(output);
}
Code snippet for JQuery:
var output = "";
for(var i=1; i <= 3; i++){
if(output .length>0)
{
output +=',';
}
output += i;
console.log(output);
}<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
You can do it simply using java 8 stream api
List<Integer> list = new ArrayList<>();
list.add(1);
list.add(2);
list.add(3);
String s = list.stream().map(i -> i.toString ()).collect(Collectors.joining(","));
String output = null; for(int i=1; i <= 3; i++) { if (null == output) output = i; else output += ", "+i; }{ if (i>1) output+=", "; output += i; }for this, but similar solutions have already been given in the comments and answers.