Question

I want to remove numbers separated by a comma in a string:

String s= "1000, 2000, 3000, 4000, 1000";
s= s.replace("1000","");
System.out.println(s);

The result is:

", 2000, 3000, 4000,"

I want to cut also leading and tailing commas, so the expected result is:

"2000, 3000, 4000"

How can I do this?

Answer 1

I would use

String s = "1000, 2000, 3000, 4000, 11000, 1000";
s = s.replaceAll("\b(1000, |, 1000)\b", "");
System.out.println(s);

prints

2000, 3000, 4000, 11000

Or I would use a proper List

List<Integer> ints = new ArrayList<Integer>(Arrays.asList(
                         1000, 2000, 3000, 4000, 1000, -1000, 11000 ));
while(ints.remove((Integer) 1000));
System.out.println(ints);

prints

[2000, 3000, 4000, -1000, 11000]

If you really have to use String, you can do

String s = "1000, 2000, 3000, 4000, 1000, -1000, 11000";
List<String> ints = new ArrayList<String>(Arrays.asList(s.split(", ")));
while (ints.remove("1000")) ;
System.out.println(ints);

prints

[2000, 3000, 4000, -1000, 11000]