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simplified the parsing using regex

This commit is contained in:
Yadukrishnan 2024-04-07 21:40:20 +02:00
parent aabaaf5ec9
commit bb499f340c
1 changed files with 17 additions and 30 deletions
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47
core-java-modules/core-java-numbers-7/src/test/java/com/baeldung/complexnumbers/ComplexNumberAddMultiplyUnitTest.java
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@ -4,6 +4,9 @@ import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.params.ParameterizedTest; import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.CsvSource; import org.junit.jupiter.params.provider.CsvSource;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
class ComplexNumber { class ComplexNumber {
public long real; public long real;
public long imaginary; public long imaginary;
@ -13,39 +16,23 @@ class ComplexNumber {
this.imaginary = b; this.imaginary = b;
} }
public ComplexNumber(String complexNumberStr1) { public ComplexNumber(String complexNumberStr) {
String complexNumberStr = complexNumberStr1.replaceAll("\\s", ""); Pattern pattern = Pattern.compile("(-?\\d+)?(?:([+-]?\\d+)i)?");
if (complexNumberStr.contains("i")) { Matcher matcher = pattern.matcher(complexNumberStr.replaceAll("\\s", ""));
// Split the string based on '+' or '-'
String[] parts = complexNumberStr.split("(?=[+-])");
if (parts.length == 1) { if (matcher.matches()) {
// Only real part (no imaginary part) // Extract real and imaginary parts
if (complexNumberStr.endsWith("i")) { String realPartStr = matcher.group(1);
real = 0; String imaginaryPartStr = matcher.group(2);
imaginary = Long.parseLong(parts[0].substring(0, parts[0].length() - 1));
// Parse real part (if present)
real = (realPartStr != null) ? Long.parseLong(realPartStr) : 0;
// Parse imaginary part (if present)
imaginary = (imaginaryPartStr != null) ? Long.parseLong(imaginaryPartStr) : 0;
} else { } else {
real = Long.parseLong(complexNumberStr); throw new IllegalArgumentException("Invalid complex number format, supported format is `a+bi`");
imaginary = 0;
}
} else if (parts.length == 2) {
// Both real and imaginary parts present
real = Long.parseLong(parts[0]);
String imaginaryString = parts[1].substring(0, parts[1].length() - 1); // Remove 'i'
if (imaginaryString.isEmpty()) {
// Only 'i' without coefficient, hence imaginary part is 1
imaginary = 1;
} else {
imaginary = Long.parseLong(imaginaryString);
}
} else {
throw new IllegalArgumentException("Invalid complex number format");
}
} else {
// Only real part without 'i'
real = Long.parseLong(complexNumberStr);
imaginary = 0;
} }
} }