From 0648a4f91852d141014b0c8170c6ecad47b7f701 Mon Sep 17 00:00:00 2001
From: "Kai.Yuan" <kent.yuan@Gmail.com>
Date: Sat, 24 Feb 2024 10:18:09 +0800
Subject: [PATCH] [modify-print-list] modify + print a list

---
 .../core-java-collections-list-6/pom.xml      |  2 +-
 .../ModifyAndPrintListElementsUnitTest.java   | 56 +++++++++++++++++++
 2 files changed, 57 insertions(+), 1 deletion(-)
 create mode 100644 core-java-modules/core-java-collections-list-6/src/test/java/com/baeldung/modifyandprint/ModifyAndPrintListElementsUnitTest.java

diff --git a/core-java-modules/core-java-collections-list-6/pom.xml b/core-java-modules/core-java-collections-list-6/pom.xml
index 18a153ff06..06e00e8dce 100644
--- a/core-java-modules/core-java-collections-list-6/pom.xml
+++ b/core-java-modules/core-java-collections-list-6/pom.xml
@@ -29,4 +29,4 @@
     <properties>
         <vavr.version>0.10.4</vavr.version>
     </properties>
-</project>
\ No newline at end of file
+</project>
diff --git a/core-java-modules/core-java-collections-list-6/src/test/java/com/baeldung/modifyandprint/ModifyAndPrintListElementsUnitTest.java b/core-java-modules/core-java-collections-list-6/src/test/java/com/baeldung/modifyandprint/ModifyAndPrintListElementsUnitTest.java
new file mode 100644
index 0000000000..7d82873103
--- /dev/null
+++ b/core-java-modules/core-java-collections-list-6/src/test/java/com/baeldung/modifyandprint/ModifyAndPrintListElementsUnitTest.java
@@ -0,0 +1,56 @@
+package com.baeldung.modifyandprint;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.util.List;
+import java.util.stream.Collectors;
+
+import org.junit.jupiter.api.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.google.common.collect.Lists;
+
+public class ModifyAndPrintListElementsUnitTest {
+
+    private final Logger log = LoggerFactory.getLogger(ModifyAndPrintListElementsUnitTest.class);
+
+    @Test
+    void whenPrintingInForEach_thenListIsPrinted() {
+        List<String> theList = Lists.newArrayList("Kai", "Liam", "Eric", "Kevin");
+        theList.forEach(e -> log.info(e));
+    }
+
+    @Test
+    void whenUsingModifyAndPrintingSeparately_thenListIsModifiedAndPrinted() {
+        List<String> theList = Lists.newArrayList("Kai", "Liam", "Eric", "Kevin");
+        theList.replaceAll(e -> e.toUpperCase());
+        theList.forEach(e -> log.info(e));
+        assertEquals(List.of("KAI", "LIAM", "ERIC", "KEVIN"), theList);
+    }
+
+    @Test
+    void whenPrintingInMap_thenStreamIsModifiedAndPrinted() {
+        List<String> theList = List.of("Kai", "Liam", "Eric", "Kevin");
+        List<String> newList = theList.stream()
+            .map(e -> {
+                String newElement = e.toUpperCase();
+                log.info(newElement);
+                return newElement;
+            })
+            .filter(e -> e.length() == 4)
+            .collect(Collectors.toList());
+        assertEquals(List.of("LIAM", "ERIC"), newList);
+    }
+
+    @Test
+    void whenPrintingInPeek_thenStreamIsModifiedAndPrinted() {
+        List<String> theList = List.of("Kai", "Liam", "Eric", "Kevin");
+        List<String> newList = theList.stream()
+            .map(e -> e.toUpperCase())
+            .peek(e -> log.info(e))
+            .filter(e -> e.length() == 4)
+            .collect(Collectors.toList());
+        assertEquals(List.of("LIAM", "ERIC"), newList);
+    }
+}
\ No newline at end of file