How to extract values from string and assign it to int variables?

Question

0.00/5 (No votes)

See more:

The variable productQR will have a string value of the format <rate>,<quantity>@<rate>,<quantity>@<rate>,<quantity>.
To give an example,
productQR = "250,10@100,3@50,7" will have the Rate as 250, 100 and 50 while Quantity as 10, 3 and 7 respectively. How can I assign those values to Rate1, Rate2 and Rate3 respectively? Same for the Quantity variable?

This is the function:

String calcGST(Receipt r) {
		String regex = "[\d]+[,]{1}[\d]+[@]{1}[\d]+[,]{1}[\d]+[@]{1}[\d]+[,]{1}[\d]+";
		Pattern p = Pattern.compile(regex);

		r.productQR = Rate + "," + q1 + "@" + Rate2 + "," + q2 + "@" + Rate3 + "," + q3; // I know this part is wrong, just for representation purpose.
		
		return null; //we have to finally return the variable in which we'll put those 6 variables for GST calculation. 

	}

this is the receipt class:

class Receipt {
	TransactionParty transactionParty;
	String productQR;

	public Receipt(TransactionParty transactionParty, String productQR) {
		super();
		this.transactionParty = transactionParty;
		this.productQR = productQR;
	}

}

What I have tried:

I tried using regex/.split() but I don't know how can we extract values from it.

Posted 29-Mar-22 21:21pm

Sourabh Jambale

Updated 29-Mar-22 21:55pm

v4

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Richard MacCutchan · Answer 1 · 2022-03-29T21:55:00

Solution 1

I would use String (Java Platform SE 7 )[^] to break the sets into a simple array. Then use the same method on each string to separate rate and quantity. You can then use Integer (Java Platform SE 7 )[^] to convert each substring to its integer value.

Posted 29-Mar-22 21:55pm

Richard MacCutchan

Comments

Sourabh Jambale 30-Mar-22 5:07am

I did for an example string:

String s1 = "250,10@100,3@50,7";
String hello[] = s1.split("@", 3);
String s2[] = null;
for (String a : hello) {
s2 = a.split(",");
for (String b : s2) {
int z = Integer.parseInt(b);
System.out.println(z);
}
}

All the integer values are stored in z but how can individually assign them to their respective variables, for example 250 to Rate1,100 to Rate 2 and so on?

Richard MacCutchan 30-Mar-22 5:46am

Use an ArrayList<t> to hold the values. Also, remember that Integer.parseInt will throw an Exception if the strings contain non-numeric characters, so you should code for that.
So something like:

class Pair {
    // this is a convenience class to keep the two values together
    public int p1;
    public int p2;
    Pair(int v1, int v2)
    {
        p1 = v1;
        p2 = v2;
    }
}

// and then the main code

String s1 = "250,10@100,3@50,7";
List<Pair> numList = new ArrayList<Pair>();
String l1[] = s1.split("@", 3);
for (String a : l1) {
    String s2[] = a.split(",");
    try {
    int v1 = Integer.parseInt(s2[0]);
    int v2 = Integer.parseInt(s2[1]);
    numList.add(new Pair(v1, v2));
    }
    catch (NumberFormatException ne)
    {
        // do something here
    }
}
for (Pair p : numList) {
    System.out.printf("%d - %d%n", p.p1, p.p2);
}