Java replace string string by other string

Question

I want to replace 1 by 1Min, 5 by 5Min, 10 by 10Min, 15 by 15Min,60 by 1Hour, 360 by 6Hours etc.

How can I do it in 1 statement.

String str = "15";
String newStr = str.replace("1", "1Min").replace("5", "5Mins").replace("10", "10Mins").replace("15", "15Mins").replace("30", "30Mins").replace("60", "1Hr").replace("120", "2Hrs").replace("240", "4Hrs").replace("480", "8Hrs").replace("720", "12Hrs").replace("1440", "24Hrs");

If I try this, i get '1Min5Mins' because it replaces 1 and then 5.

This could be a stupid question, I can do it with switch or if, else-if. just wondering can this be done in 1 line code. Thanks

Nothing... I know there will be only these values (1,5,10,15,30,60,120,240,480,600,720,1440) — Ana
– Ana, Commented Nov 23, 2015 at 15:06

ParkerHalo · Accepted Answer · 2018-02-19 08:07:12Z

6

You could try something like this:

String str = "15";
int minutes = Integer.parseInt(str);
if (minutes < 60)
    str += "Mins";
else
    str = (minutes/60) + "Hrs";

but be aware that Integer.parseInt() will throw an exception if you try to parse anthing else than a number. This can be inaccurate if the hours are not exact (365 will be replaced by 6 hours although it's 6 hours and 5 minutes)

Here's the 1-liner:

str = Integer.parseInt(str) < 60 ? str+"Mins" : (Integer.parseInt(str)/60) + (Integer.parseInt(str)/60 == 1 ? "Hr" : "Hrs");

although this would be more readable with a 2-liner:

int minutes = Integer.parseInt(str);
str = minutes < 60 ? str+"Mins" : (minutes/60) + (minutes/60 == 1 ? "Hr" : "Hrs");

edited Feb 19, 2018 at 8:07

answered Nov 23, 2015 at 14:57

ParkerHalo

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8 Comments

Ana Over a year ago

This is not 1 line code sir :) I know I can do it this way.

ParkerHalo Over a year ago

@Ana i'll write you a 1 liner but it's not very pretty then ;)

Ana Over a year ago

Great... Thanks for this, i think this is more elegant :)

ParkerHalo Over a year ago

@Ana more importantly it's a lot more readable and should also be way faster!

Ana Over a year ago

But for 60 it will give 60Min instead of 1 Hr

|

Murat Karagöz · Accepted Answer · 2015-11-23 15:08:06Z

3

Here is the one-liner for you:

String newStr = str.replaceAll("\\b1\\b", "1Min").replaceAll("\\b5\\b", "5Mins").replace("10", "10Mins").replace("15", "15Mins").replace("30", "30Mins").replace("60", "1Hr").replace("120", "2Hrs").replace("240", "4Hrs").replace("480", "8Hrs").replace("720", "12Hrs").replace("1440", "24Hrs");

With the regex word boundaries. Was too lazy to finish it till the end.

answered Nov 23, 2015 at 15:08

Murat Karagöz

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2 Comments

Ana Over a year ago

This is awesome. Thanks :)

Murat Karagöz Over a year ago

@Ana np, pls go ahead and mark this as an answer so the lazy way of coding shows on top :)

Keppil · Accepted Answer · 2015-11-23 15:02:07Z

2

You could adjust for the earlier replacements when looking for later replacements:

String str = "15";
String newStr = str.replace("1", "1Min").replace("5", "5Mins").replace("1Min0", "10Mins").replace("1Min5Mins", "15Mins").replace("30", "30Mins")
                       .replace("60", "1Hr").replace("1Min20", "2Hrs").replace("240", "4Hrs").replace("480", "8Hrs").replace("720", "12Hrs")
                       .replace("1Min440", "24Hrs");

This way, the 1 in 15 will first be replaced by 1Min, then the 5 will be replaced by 5Mins and then 1Min5Mins will be replaced by 15Mins.

It is not the most elegant solution though, but it is the only way I can think of to replace everything in one line.

answered Nov 23, 2015 at 15:02

Keppil

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1 Comment

ParkerHalo Over a year ago

I really like what you are doing there :D +1 for nice-ugly code ;)

brso05 · Accepted Answer · 2015-11-23 15:13:30Z

1

This may not be a one liner but it is a dynamic approach to your problem:

public static void main(String[] args) throws FileNotFoundException {
    String test = "15 20 60 360";
    Pattern pattern = Pattern.compile("\\d+");

    Matcher matcher = pattern.matcher(test);
    while(matcher.find())
    {
        int temp = Integer.parseInt(matcher.group(0));
        if(temp >= 60)
        {
            int temp1 = temp / 60;
            test = test.replaceFirst(("" + temp), ("" + temp1 + "Hour(s)"));
        }
        else
        {
            test = test.replaceFirst(("" + temp), ("" + temp + "Min(s)"));
        }
    }
    System.out.println(test);
}

Output:

15Min(s) 20Min(s) 1Hour(s) 6Hour(s)

edited Nov 23, 2015 at 15:13

answered Nov 23, 2015 at 14:54

brso05

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