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Used records intead of plain class

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This commit is contained in:
Yadukrishnan 2024-04-09 22:04:14 +02:00
parent 9ddceb29f1
commit 423e60577d
2 changed files with 20 additions and 34 deletions
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28
core-java-modules/core-java-numbers-7/src/main/java/com/baeldung/complexnumbers/ComplexNumber.java
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@ -3,16 +3,9 @@ package com.baeldung.complexnumbers;
import java.util.regex.Matcher; import java.util.regex.Matcher;
import java.util.regex.Pattern; import java.util.regex.Pattern;
public class ComplexNumber { public record ComplexNumber(double real, double imaginary) {
public double real;
public double imaginary;
public ComplexNumber(double a, double b) { public static ComplexNumber fromString(String complexNumberStr) {
this.real = a;
this.imaginary = b;
}
public ComplexNumber(String complexNumberStr) {
Pattern pattern = Pattern.compile("(-?\\d*\\.?\\d+)?(?:([+-]?\\d*\\.?\\d+)i)?"); Pattern pattern = Pattern.compile("(-?\\d*\\.?\\d+)?(?:([+-]?\\d*\\.?\\d+)i)?");
Matcher matcher = pattern.matcher(complexNumberStr.replaceAll("\\s", "")); Matcher matcher = pattern.matcher(complexNumberStr.replaceAll("\\s", ""));
@ -23,29 +16,22 @@ public class ComplexNumber {
String imaginaryPartStr = matcher.group(2); String imaginaryPartStr = matcher.group(2);
// Parse real part (if present) // Parse real part (if present)
real = (realPartStr != null) ? Double.parseDouble(realPartStr) : 0; double real = (realPartStr != null) ? Double.parseDouble(realPartStr) : 0;
// Parse imaginary part (if present) // Parse imaginary part (if present)
imaginary = (imaginaryPartStr != null) ? Double.parseDouble(imaginaryPartStr) : 0; double imaginary = (imaginaryPartStr != null) ? Double.parseDouble(imaginaryPartStr) : 0;
return new ComplexNumber(real, imaginary);
} else { } else {
throw new IllegalArgumentException("Invalid complex number format(" + complexNumberStr + "), supported format is `a+bi`"); throw new IllegalArgumentException("Invalid complex number format(" + complexNumberStr + "), supported format is `a+bi`");
} }
} }
public double getReal() {
return real;
}
public double getImaginary() {
return imaginary;
}
public String toString() { public String toString() {
return real + "+" + imaginary + "i"; return real + "+" + imaginary + "i";
} }
public ComplexNumber add(ComplexNumber that) { public ComplexNumber add(ComplexNumber that) {
return new ComplexNumber(real + that.getReal(), imaginary + that.getImaginary()); return new ComplexNumber(real + that.real, imaginary + that.imaginary);
} }
public ComplexNumber multiply(ComplexNumber that) { public ComplexNumber multiply(ComplexNumber that) {
@ -55,7 +41,7 @@ public class ComplexNumber {
} }
public ComplexNumber subtract(ComplexNumber that) { public ComplexNumber subtract(ComplexNumber that) {
return new ComplexNumber(real - that.getReal(), imaginary - that.getImaginary()); return new ComplexNumber(real - that.real, imaginary - that.imaginary);
} }
public ComplexNumber divide(ComplexNumber that) { public ComplexNumber divide(ComplexNumber that) {

26
core-java-modules/core-java-numbers-7/src/test/java/com/baeldung/complexnumbers/ComplexNumberOperationsUnitTest.java
View File

@ -19,9 +19,9 @@ public class ComplexNumberOperationsUnitTest {
"2+4i, 0, 0" "2+4i, 0, 0"
}) })
public void multiply_two_complex_numbers(String complexStr1, String complexStr2, String expectedStr) { public void multiply_two_complex_numbers(String complexStr1, String complexStr2, String expectedStr) {
ComplexNumber complex1 = new ComplexNumber(complexStr1); ComplexNumber complex1 = ComplexNumber.fromString(complexStr1);
ComplexNumber complex2 = new ComplexNumber(complexStr2); ComplexNumber complex2 = ComplexNumber.fromString(complexStr2);
ComplexNumber expected = new ComplexNumber(expectedStr); ComplexNumber expected = ComplexNumber.fromString(expectedStr);
ComplexNumber product = complex1.multiply(complex2); ComplexNumber product = complex1.multiply(complex2);
Assertions.assertTrue(isSame(product, expected)); Assertions.assertTrue(isSame(product, expected));
} }
@ -39,9 +39,9 @@ public class ComplexNumberOperationsUnitTest {
"2+4i, 0, 2+4i" "2+4i, 0, 2+4i"
}) })
public void add_two_complex_numbers(String complexStr1, String complexStr2, String expectedStr) { public void add_two_complex_numbers(String complexStr1, String complexStr2, String expectedStr) {
ComplexNumber complex1 = new ComplexNumber(complexStr1); ComplexNumber complex1 = ComplexNumber.fromString(complexStr1);
ComplexNumber complex2 = new ComplexNumber(complexStr2); ComplexNumber complex2 = ComplexNumber.fromString(complexStr2);
ComplexNumber expected = new ComplexNumber(expectedStr); ComplexNumber expected = ComplexNumber.fromString(expectedStr);
ComplexNumber sum = complex1.add(complex2); ComplexNumber sum = complex1.add(complex2);
Assertions.assertTrue(isSame(sum, expected)); Assertions.assertTrue(isSame(sum, expected));
} }
@ -59,9 +59,9 @@ public class ComplexNumberOperationsUnitTest {
"2+4i, 0, 2+4i" "2+4i, 0, 2+4i"
}) })
public void subtract_two_complex_numbers(String complexStr1, String complexStr2, String expectedStr) { public void subtract_two_complex_numbers(String complexStr1, String complexStr2, String expectedStr) {
ComplexNumber complex1 = new ComplexNumber(complexStr1); ComplexNumber complex1 = ComplexNumber.fromString(complexStr1);
ComplexNumber complex2 = new ComplexNumber(complexStr2); ComplexNumber complex2 = ComplexNumber.fromString(complexStr2);
ComplexNumber expected = new ComplexNumber(expectedStr); ComplexNumber expected = ComplexNumber.fromString(expectedStr);
ComplexNumber sum = complex1.subtract(complex2); ComplexNumber sum = complex1.subtract(complex2);
Assertions.assertTrue(isSame(sum, expected)); Assertions.assertTrue(isSame(sum, expected));
} }
@ -79,14 +79,14 @@ public class ComplexNumberOperationsUnitTest {
"2+4i, 1, 2+4i" "2+4i, 1, 2+4i"
}) })
public void divide_two_complex_numbers(String complexStr1, String complexStr2, String expectedStr) { public void divide_two_complex_numbers(String complexStr1, String complexStr2, String expectedStr) {
ComplexNumber complex1 = new ComplexNumber(complexStr1); ComplexNumber complex1 = ComplexNumber.fromString(complexStr1);
ComplexNumber complex2 = new ComplexNumber(complexStr2); ComplexNumber complex2 = ComplexNumber.fromString(complexStr2);
ComplexNumber expected = new ComplexNumber(expectedStr); ComplexNumber expected = ComplexNumber.fromString(expectedStr);
ComplexNumber sum = complex1.divide(complex2); ComplexNumber sum = complex1.divide(complex2);
Assertions.assertTrue(isSame(sum, expected)); Assertions.assertTrue(isSame(sum, expected));
} }
public boolean isSame(ComplexNumber result, ComplexNumber expected) { public boolean isSame(ComplexNumber result, ComplexNumber expected) {
return result.real == expected.real && result.imaginary == expected.imaginary; return result.real() == expected.real() && result.imaginary() == expected.imaginary();
} }
} }