Make private class final

Author: garydgregory

src/main/java/org/apache/bcel/verifier/statics/Pass3aVerifier.java

@@ -113,7 +113,7 @@ public final class Pass3aVerifier extends PassVerifier {
     /**
      * This visitor class does the actual checking for the instruction operand's constraints.
      */
-    private class InstOperandConstraintVisitor extends org.apache.bcel.generic.EmptyVisitor {
+    private final class InstOperandConstraintVisitor extends org.apache.bcel.generic.EmptyVisitor {
         /** The ConstantPoolGen instance this Visitor operates on. */
         private final ConstantPoolGen constantPoolGen;
 

src/main/java/org/apache/bcel/verifier/structurals/ControlFlowGraph.java

@@ -43,7 +43,7 @@ public class ControlFlowGraph {
     /**
      * Objects of this class represent a node in a ControlFlowGraph. These nodes are instructions, not basic blocks.
      */
-    private class InstructionContextImpl implements InstructionContext {
+    private final class InstructionContextImpl implements InstructionContext {
 
         /**
          * The TAG field is here for external temporary flagging, such as graph coloring.

src/main/java/org/apache/bcel/verifier/structurals/Subroutines.java

@@ -64,7 +64,7 @@ private enum ColourConstants {
     /**
      * This inner class implements the Subroutine interface.
      */
-    private class SubroutineImpl implements Subroutine {
+    private final class SubroutineImpl implements Subroutine {
         /**
          * UNSET, a symbol for an uninitialized localVariable field. This is used for the "top-level" Subroutine; i.e. no
          * subroutine.