Delete single Char in String java [duplicate]

Question

This question already has answers here:

How do I compare strings in Java? (23 answers)

Closed 9 years ago.

I have an array of String, and the items are like : 02:11, 11:12..
I want to delete the 0 in first position.

if (orari[i].substring(0,0) == "0") {
   orari[i] = orari[i].substring(1,4);
}

It doesn't work, why?

Answer 1

Firstly your substring bounds are faulty. 0, 0 means 0 length string. That will not get you first character. You should use 0, 1. And then use equals() method for String comparison:

if (orari[i].substring(0,1).equals("0"))

Also, you can avoid that substring in if condition by using charAt() method:

if (orari[i].charAt(0) == '0')

Answer 2

Because it should be like this:

if (orari[i].charAt(0) == '0') {
   orari[i] = orari[i].substring(1,4);
}

Answer 3

if (orari[i].substring(0,0).equals("0")) {
   orari[i] = orari[i].substring(1,4);
}

use equals() to compare string, not ==