src/share/classes/sun/reflect/SignatureIterator.java

@@ -26,11 +26,11 @@
 package sun.reflect;
 
 /** Assists in iterating down a method's signature */
 
 public class SignatureIterator {
-    private String sig;
+    private final String sig;
     private int idx;
 
     public SignatureIterator(String sig) {
         this.sig = sig;
         reset();