jdk/src/share/classes/java/awt/FontMetrics.java

@@ -27,10 +27,12 @@
 
 import java.awt.Graphics2D;
 import java.awt.font.FontRenderContext;
 import java.awt.font.LineMetrics;
 import java.awt.geom.Rectangle2D;
+import java.nio.charset.Charset;
+import java.nio.charset.StandardCharsets;
 import java.text.CharacterIterator;
 
 /**
  * The <code>FontMetrics</code> class defines a font metrics object, which
  * encapsulates information about the rendering of a particular font on a

@@ -408,11 +410,11 @@
      *            the bounds of the <code>data</code> array.
      * @see       #charsWidth(char[], int, int)
      * @see       #stringWidth(String)
      */
     public int bytesWidth(byte data[], int off, int len) {
-        return stringWidth(new String(data, 0, off, len));
+        return stringWidth(new String(data, off, len, StandardCharsets.ISO_8859_1));
     }
 
     /**
      * Gets the advance widths of the first 256 characters in the
      * <code>Font</code>.  The advance is the