BAEL-6461: What's the difference between Scanner next() and nextLine() methods? (#14057)

core-java-modules/core-java-io-apis-2/src/test/java/com/baeldung/scanner/NextVsNextLineUnitTest.java

@@ -0,0 +1,51 @@
+package com.baeldung.scanner;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.util.Scanner;
+
+import org.junit.jupiter.api.Test;
+
+class NextVsNextLineUnitTest {
+
+    @Test
+    void givenInput_whenUsingNextMethod_thenReturnToken() {
+        String input = "Hello world";
+        try (Scanner scanner = new Scanner(input)) {
+            assertEquals("Hello", scanner.next());
+            assertEquals("world", scanner.next());
+        }
+    }
+
+    @Test
+    void givenInput_whenUsingNextMethodWithCustomDelimiter_thenReturnToken() {
+        String input = "Hello :world";
+        try (Scanner scanner = new Scanner(input)) {
+            scanner.useDelimiter(":");
+
+            assertEquals("Hello ", scanner.next());
+            assertEquals("world", scanner.next());
+        }
+    }
+
+    @Test
+    void givenInput_whenUsingNextLineMethod_thenReturnEntireLine() {
+        String input = "Hello world\nWelcome to baeldung.com";
+        try (Scanner scanner = new Scanner(input)) {
+            assertEquals("Hello world", scanner.nextLine());
+            assertEquals("Welcome to baeldung.com", scanner.nextLine());
+        }
+    }
+
+    @Test
+    void givenInput_whenUsingNextLineWithCustomDelimiter_thenIgnoreDelimiter() {
+        String input = "Hello:world\nWelcome:to baeldung.com";
+        try (Scanner scanner = new Scanner(input)) {
+            scanner.useDelimiter(":");
+
+            assertEquals("Hello:world", scanner.nextLine());
+            assertEquals("Welcome:to baeldung.com", scanner.nextLine());
+        }
+    }
+
+}