Merge pull request #18878 from tecofers/BAEL-9480-string-to-int-array

BAEL-9480: Add code for article: Splitting String and Put It on int A…

Author: xaeldung

core-java-modules/core-java-string-conversions-4/src/main/java/com/baeldung/splitstringtointarray/SplitStringToIntArray.java

@@ -0,0 +1,19 @@
+package com.baeldung.splitstringtointarray;
+
+public class SplitStringToIntArray {
+
+    public int[] convert(String numbers, String delimiterRegex) {
+        if (numbers == null || numbers.isEmpty()) {
+            return new int[0];
+        }
+
+        String[] parts = numbers.split(delimiterRegex);
+        int[] intArray = new int[parts.length];
+
+        for (int i = 0; i < parts.length; i++) {
+            intArray[i] = Integer.parseInt(parts[i].trim());
+        }
+
+        return intArray;
+    }
+}

core-java-modules/core-java-string-conversions-4/src/test/java/com/baeldung/splitstringtointarray/StringToIntArrayConverterUnitTest.java

@@ -0,0 +1,33 @@
+package com.baeldung.splitstringtointarray;
+
+import org.junit.jupiter.api.Test;
+import static org.assertj.core.api.Assertions.assertThat;
+
+class StringToIntArrayConverterUnitTest {
+
+    private final SplitStringToIntArray converter = new SplitStringToIntArray();
+
+    @Test
+    void givenCommaSeparatedString_whenConvert_thenReturnIntArray() {
+        int[] result = converter.convert("10, 20, 30, 40, 50", ",");
+        assertThat(result).containsExactly(10, 20, 30, 40, 50);
+    }
+
+    @Test
+    void givenSemicolonSeparatedString_whenConvert_thenReturnIntArray() {
+        int[] result = converter.convert("10; 20; 30; 40; 50", ";");
+        assertThat(result).containsExactly(10, 20, 30, 40, 50);
+    }
+
+    @Test
+    void givenPipeSeparatedString_whenConvert_thenReturnIntArray() {
+        int[] result = converter.convert("10|20|30|40|50", "\\|");
+        assertThat(result).containsExactly(10, 20, 30, 40, 50);
+    }
+
+    @Test
+    void givenEmptyString_whenConvert_thenReturnEmptyArray() {
+        int[] result = converter.convert("", ",");
+        assertThat(result).isEmpty();
+    }
+}