--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/jdk/java/util/Formatter/EncodingTest.java	Tue Dec 12 11:10:12 2017 -0800
@@ -0,0 +1,133 @@
+/*
+ * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.nio.charset.Charset;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.util.Formatter;
+import java.util.Locale;
+import org.testng.Assert;
+import org.testng.annotations.DataProvider;
+import org.testng.annotations.Test;
+
+/**
+ * @test
+ * @bug 8183743
+ * @summary Test to verify the new overload method with Charset functions the same
+ * as the existing method that takes a charset name.
+ * @run testng EncodingTest
+ */
+public class EncodingTest {
+    static String USER_DIR = System.getProperty("user.dir", ".");
+
+    // Charset added only for the 3-parameter constructors
+    public static enum ConstructorType {
+        STRING3,
+        FILE3,
+        OUTPUTSTREAM3
+    }
+
+    @DataProvider(name = "parameters")
+    public Object[][] getParameters() throws IOException {
+        Locale l = Locale.getDefault();
+        String csn1 = StandardCharsets.ISO_8859_1.name();
+        Charset charset1 = StandardCharsets.ISO_8859_1;
+        String csn2 = StandardCharsets.UTF_8.name();
+        Charset charset2 = StandardCharsets.UTF_8;
+
+        File file1 = new File(USER_DIR, "FormatterCharsetTest1.txt");
+        File file2 = new File(USER_DIR, "FormatterCharsetTest2.txt");
+
+        return new Object[][]{
+            {ConstructorType.STRING3, file1, file2, csn1, charset1},
+            {ConstructorType.FILE3, file1, file2, csn1, charset1},
+            {ConstructorType.OUTPUTSTREAM3, file1, file2, csn1, charset1},
+            {ConstructorType.STRING3, file1, file2, csn2, charset2},
+            {ConstructorType.FILE3, file1, file2, csn2, charset2},
+            {ConstructorType.OUTPUTSTREAM3, file1, file2, csn2, charset2},
+        };
+    }
+
+    /**
+     * Verifies that the overloading constructor behaves the same as the existing
+     * one.
+     * @param type the type of the constructor
+     * @param file1 file1 written with the name of a charset
+     * @param file2 file2 written with a charset
+     * @param csn the charset name
+     * @param charset the charset
+     * @throws IOException
+     */
+    @Test(dataProvider = "parameters")
+    public void testConstructor(ConstructorType type, File file1, File file2,
+            String csn, Charset charset) throws Exception {
+        format(getFormatter(type, file1.getPath(), csn, null));
+        format(getFormatter(type, file2.getPath(), null, charset));
+        Assert.assertEquals(Files.readAllLines(Paths.get(file1.getPath()), charset),
+                Files.readAllLines(Paths.get(file2.getPath()), charset));
+    }
+
+    void format(Formatter formatter)
+            throws IOException {
+        formatter.format("abcde \u00FA\u00FB\u00FC\u00FD");
+        formatter.format("Java \uff08\u8ba1\u7b97\u673a\u7f16\u7a0b\u8bed\u8a00\uff09");
+        formatter.flush();
+        formatter.close();
+    }
+
+
+    Formatter getFormatter(ConstructorType type, String path, String csn, Charset charset)
+            throws IOException {
+        Formatter formatter = null;
+        if (csn != null) {
+            switch (type) {
+                case STRING3:
+                    formatter = new Formatter(path, csn, Locale.getDefault());
+                    break;
+                case FILE3:
+                    formatter = new Formatter(new File(path), csn, Locale.getDefault());
+                    break;
+                case OUTPUTSTREAM3:
+                    formatter = new Formatter(new FileOutputStream(path), csn, Locale.getDefault());
+                    break;
+            }
+        } else {
+            switch (type) {
+                case STRING3:
+                    formatter = new Formatter(path, charset, Locale.getDefault());
+                    break;
+                case FILE3:
+                    formatter = new Formatter(new File(path), charset, Locale.getDefault());
+                    break;
+                case OUTPUTSTREAM3:
+                    formatter = new Formatter(new FileOutputStream(path), charset, Locale.getDefault());
+                    break;
+            }
+        }
+        return formatter;
+    }
+}