BAEL-1073 Converting a List to String in Java (#2489)

core-java/src/test/java/org/baeldung/java/lists/ListToSTring.java

@@ -0,0 +1,31 @@
+package org.baeldung.java.lists;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.stream.Collectors;
+
+import org.apache.commons.lang3.StringUtils;
+import org.junit.Test;
+
+public class ListToSTring {
+
+    @Test
+    public void whenListToString_thenPrintDefault() {
+        List<Integer> intLIst = Arrays.asList(1, 2, 3);
+        System.out.println(intLIst);
+    }
+
+    @Test
+    public void whenCollectorsJoining_thenPrintCustom() {
+        List<Integer> intList = Arrays.asList(1, 2, 3);
+        System.out.println(intList.stream()
+            .map(n -> String.valueOf(n))
+            .collect(Collectors.joining("-", "{", "}")));
+    }
+    
+    @Test
+    public void whenStringUtilsJoin_thenPrintCustom() {
+        List<Integer> intList = Arrays.asList(1, 2, 3);
+       System.out.println(StringUtils.join(intList, "|"));
+    }
+}