diff --git a/api/current.txt b/api/current.txt
index 4175e64efea76..f61f0fadf67b2 100644
--- a/api/current.txt
+++ b/api/current.txt
@@ -58686,6 +58686,15 @@ package java.util {
     method public synchronized int search(java.lang.Object);
   }
 
+  public final class StringJoiner {
+    ctor public StringJoiner(java.lang.CharSequence);
+    ctor public StringJoiner(java.lang.CharSequence, java.lang.CharSequence, java.lang.CharSequence);
+    method public java.util.StringJoiner add(java.lang.CharSequence);
+    method public int length();
+    method public java.util.StringJoiner merge(java.util.StringJoiner);
+    method public java.util.StringJoiner setEmptyValue(java.lang.CharSequence);
+  }
+
   public class StringTokenizer implements java.util.Enumeration {
     ctor public StringTokenizer(java.lang.String, java.lang.String, boolean);
     ctor public StringTokenizer(java.lang.String, java.lang.String);
diff --git a/api/system-current.txt b/api/system-current.txt
index 8e5b99c4bad5a..59c162c91e443 100644
--- a/api/system-current.txt
+++ b/api/system-current.txt
@@ -61784,6 +61784,15 @@ package java.util {
     method public synchronized int search(java.lang.Object);
   }
 
+  public final class StringJoiner {
+    ctor public StringJoiner(java.lang.CharSequence);
+    ctor public StringJoiner(java.lang.CharSequence, java.lang.CharSequence, java.lang.CharSequence);
+    method public java.util.StringJoiner add(java.lang.CharSequence);
+    method public int length();
+    method public java.util.StringJoiner merge(java.util.StringJoiner);
+    method public java.util.StringJoiner setEmptyValue(java.lang.CharSequence);
+  }
+
   public class StringTokenizer implements java.util.Enumeration {
     ctor public StringTokenizer(java.lang.String, java.lang.String, boolean);
     ctor public StringTokenizer(java.lang.String, java.lang.String);
diff --git a/api/test-current.txt b/api/test-current.txt
index 7fbae9776194b..d83c01799ff94 100644
--- a/api/test-current.txt
+++ b/api/test-current.txt
@@ -58760,6 +58760,15 @@ package java.util {
     method public synchronized int search(java.lang.Object);
   }
 
+  public final class StringJoiner {
+    ctor public StringJoiner(java.lang.CharSequence);
+    ctor public StringJoiner(java.lang.CharSequence, java.lang.CharSequence, java.lang.CharSequence);
+    method public java.util.StringJoiner add(java.lang.CharSequence);
+    method public int length();
+    method public java.util.StringJoiner merge(java.util.StringJoiner);
+    method public java.util.StringJoiner setEmptyValue(java.lang.CharSequence);
+  }
+
   public class StringTokenizer implements java.util.Enumeration {
     ctor public StringTokenizer(java.lang.String, java.lang.String, boolean);
     ctor public StringTokenizer(java.lang.String, java.lang.String);