need help with some code i gotta present today

[proper otter]

i have gotten a code that i need to present today in front of my class. I really cant wrap my head around the code.

[lusty sun]

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[proper otter]

this is the code

package com.example.s2_project_final;

import org.jetbrains.annotations.Contract;
import org.jetbrains.annotations.NotNull;

import java.math.BigInteger;

public class Convert {
    // Funksionet e kovertimit
    @NotNull
    @Contract(pure = true)
    public static String doconvert(String inputi, String from, String to) {
        int fromBase = getBase(from);
        int toBase = getBase(to);
        BigInteger number = new BigInteger(inputi, fromBase);
        return number.toString(toBase);
    }

    private static int getBase(String vlerat) {
        return switch (vlerat) {
            case "Binar" -> 2;
            case "Decimal" -> 10;
            case "Oktal" -> 8;
            case "Heksadecimal" -> 16;
            default -> throw new UnsupportedOperationException("Invalid numeral system: " + vlerat);
        };
    }
}

this is supposed to turn numbers into other types of numbers (decimal numbers to binary, octal, hexadecimal and vise versa)

[bleak cosmos]

Alright

What part is it you don't understand?

[proper otter]

the part of the conversion of the numbers from one to the other

i dont see where that happens

is it a part of the library of the bigint or idk

[bleak cosmos]

Yes it is

It happens at

number.toString(toBase)