8001209: Evaluate findbugs reprot for java.text.ChoiceFormat

Reviewed-by: okutsu

jdk/src/share/classes/java/text/ChoiceFormat.java

@@ -338,8 +338,8 @@ public class ChoiceFormat extends NumberFormat {
             throw new IllegalArgumentException(
                 "Array and limit arrays must be of the same length.");
         }
-        choiceLimits = limits;
-        choiceFormats = formats;
+        choiceLimits = Arrays.copyOf(limits, limits.length);
+        choiceFormats = Arrays.copyOf(formats, formats.length);
     }
 
     /**
@@ -347,7 +347,8 @@ public class ChoiceFormat extends NumberFormat {
      * @return the limits.
      */
     public double[] getLimits() {
-        return choiceLimits;
+        double[] newLimits = Arrays.copyOf(choiceLimits, choiceLimits.length);
+        return newLimits;
     }
 
     /**
@@ -355,7 +356,8 @@ public class ChoiceFormat extends NumberFormat {
      * @return the formats.
      */
     public Object[] getFormats() {
-        return choiceFormats;
+        Object[] newFormats = Arrays.copyOf(choiceFormats, choiceFormats.length);
+        return newFormats;
     }
 
     // Overrides

jdk/test/java/text/Format/ChoiceFormat/Bug8001209.java

@@ -0,0 +1,90 @@
+/*
+ * Copyright (c) 2012, 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.
+ */
+
+/**
+ * @test
+ * @bug 8001209
+ * @summary Confirm that the values set by setChoices() are not mutable.
+ */
+import java.text.*;
+
+public class Bug8001209 {
+
+    public static void main(String[] args) throws Exception {
+        boolean err = false;
+
+        // Borrow an example in API doc
+        double[] limits = {1,2,3,4,5,6,7};
+        String[] dayOfWeekNames = {"Sun","Mon","Tue","Wed","Thu","Fri","Sat"};
+        ChoiceFormat form = new ChoiceFormat(limits, dayOfWeekNames);
+        ParsePosition status = new ParsePosition(0);
+
+        StringBuilder before = new StringBuilder();
+        for (double i = 1.0; i <= 7.0; ++i) {
+            status.setIndex(0);
+            String s = form.format(i);
+            before.append(" ");
+            before.append(s);
+            before.append(form.parse(form.format(i),status));
+        }
+        String original = before.toString();
+
+        double[] newLimits = form.getLimits();
+        String[] newFormats = (String[])form.getFormats();
+        newFormats[6] = "Doyoubi";
+        StringBuilder after = new StringBuilder();
+        for (double i = 1.0; i <= 7.0; ++i) {
+            status.setIndex(0);
+            String s = form.format(i);
+            after.append(" ");
+            after.append(s);
+            after.append(form.parse(form.format(i),status));
+        }
+        if (!original.equals(after.toString())) {
+            err = true;
+            System.err.println("  Expected:" + before
+                               + "\n  Got:     " + after);
+        }
+
+        dayOfWeekNames[6] = "Saturday";
+        after = new StringBuilder();
+        for (double i = 1.0; i <= 7.0; ++i) {
+            status.setIndex(0);
+            String s = form.format(i);
+            after.append(" ");
+            after.append(s);
+            after.append(form.parse(form.format(i),status));
+        }
+        if (!original.equals(after.toString())) {
+            err = true;
+            System.err.println("  Expected:" + before
+                               + "\n  Got:     " + after);
+        }
+
+        if (err) {
+            throw new RuntimeException("Failed.");
+        } else {
+            System.out.println("Passed.");
+        }
+    }
+}