How do I represent numbers in the format

```
001 = 1
002 = 2
003 = 3
010 = 10
020 = 20
```

The number of digits is always 3.

`Integer.valueOf("020")`

is sufficient for your purpose. It will give you 20 as a result. After that you can use it as `Integer`

, `int`

or `String`

.

Am I missing something obvious here?

```
String num_str = "001"
Integer val = Integer.parseInt(num_str);
String answer = val.toString();
```

You can take a look at this previous SO post.

If you want to output integers such that they always have leading zeros, use String.format with a zero before the number of digits in the format string, for example:

```
int i = 3;
String s = String.format("%03d", i);
System.out.println(s);
```

Gives the output:

```
003
```

You can use something like this

```
DecimalFormat decimalFormat = new DecimalFormat();
decimalFormat.setMinimumIntegerDigits(3);
System.err.println(decimalFormat.format(2));
```

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