src/java.base/share/classes/java/lang/AbstractStringBuilder.java

@@ -23,12 +23,14 @@
  * questions.
  */
 
 package java.lang;
 
-import jdk.internal.math.FloatingDecimal;
+import jdk.internal.math.DoubleToDecimal;
+import jdk.internal.math.FloatToDecimal;
 
+import java.io.IOException;
 import java.util.Arrays;
 import java.util.Spliterator;
 import java.util.stream.IntStream;
 import java.util.stream.StreamSupport;
 

@@ -878,11 +880,15 @@
      *
      * @param   f   a {@code float}.
      * @return  a reference to this object.
      */
     public AbstractStringBuilder append(float f) {
-        FloatingDecimal.appendTo(f,this);
+        try {
+            FloatToDecimal.appendTo(f, this);
+        } catch (IOException ignored) {
+            assert false;
+        }
         return this;
     }
 
     /**
      * Appends the string representation of the {@code double}

@@ -895,11 +901,15 @@
      *
      * @param   d   a {@code double}.
      * @return  a reference to this object.
      */
     public AbstractStringBuilder append(double d) {
-        FloatingDecimal.appendTo(d,this);
+        try {
+            DoubleToDecimal.appendTo(d, this);
+        } catch (IOException ignored) {
+            assert false;
+        }
         return this;
     }
 
     /**
      * Removes the characters in a substring of this sequence.