StringUtils.join(Iterator, String) should only return null when the
Iterator is null
diff --git a/src/changes/changes.xml b/src/changes/changes.xml
index 5d2d1f7..0c20ea8 100644
--- a/src/changes/changes.xml
+++ b/src/changes/changes.xml
@@ -90,6 +90,7 @@
<action type="fix" dev="ggregory" due-to="guicaiyue">Javadoc: StringUtils.repeat("", "x", 3) = "xx"; #918.</action>
<action type="fix" dev="ggregory" due-to="Marc Wrobel">Fix typos #920, #923.</action>
<action type="fix" dev="ggregory" due-to="Bhimantoro Suryo Admodjo">Simplify condition #925.</action>
+ <action type="fix" dev="ggregory" due-to="Gary Gregory">StringUtils.join(Iterable, String) should only return null when the Iterable is null.</action>
<action type="fix" dev="ggregory" due-to="Gary Gregory">StringUtils.join(Iterator, String) should only return null when the Iterator is null.</action>
<!-- ADD -->
<action type="add" dev="ggregory" due-to="Gary Gregory">Add GitHub coverage.yml.</action>
diff --git a/src/main/java/org/apache/commons/lang3/StringUtils.java b/src/main/java/org/apache/commons/lang3/StringUtils.java
index b316b14..573b652 100644
--- a/src/main/java/org/apache/commons/lang3/StringUtils.java
+++ b/src/main/java/org/apache/commons/lang3/StringUtils.java
@@ -4394,23 +4394,19 @@
if (!iterator.hasNext()) {
return EMPTY;
}
- final Object first = iterator.next();
- if (!iterator.hasNext()) {
- return toStringOrEmpty(first);
- }
// two or more elements
final StringBuilder buf = new StringBuilder(STRING_BUILDER_SIZE); // Java default is 16, probably too small
- if (first != null) {
- buf.append(first);
- }
while (iterator.hasNext()) {
- buf.append(separator);
final Object obj = iterator.next();
if (obj != null) {
buf.append(obj);
}
+ if (iterator.hasNext()) {
+ buf.append(separator);
+ }
+
}
return buf.toString();
diff --git a/src/test/java/org/apache/commons/lang3/StringUtilsTest.java b/src/test/java/org/apache/commons/lang3/StringUtilsTest.java
index 4ef061b..bc5aeef 100644
--- a/src/test/java/org/apache/commons/lang3/StringUtilsTest.java
+++ b/src/test/java/org/apache/commons/lang3/StringUtilsTest.java
@@ -1292,6 +1292,7 @@
assertEquals("", StringUtils.join(Arrays.asList(NULL_ARRAY_LIST).iterator(), SEPARATOR_CHAR));
assertEquals("", StringUtils.join(Arrays.asList(EMPTY_ARRAY_LIST).iterator(), SEPARATOR_CHAR));
assertEquals("foo", StringUtils.join(Collections.singleton("foo").iterator(), 'x'));
+ assertEquals("null", StringUtils.join(Arrays.asList(NULL_TO_STRING_LIST).iterator(), SEPARATOR_CHAR));
}
@Test
