http://www.javassist.org/: Javassist (JAVA programming ASSISTant) makes Java bytecode manipulation simple. It is a class library for editing bytecodes in Java. (Shigeru Chiba, www.javassist.org) 
class javassist.bytecode.Utf8Info extends javassist.bytecode.ConstInfo
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: javassist.bytecode.Utf8Info
  super_class: javassist.bytecode.ConstInfo
{
  static final int tag;
    descriptor: I
    flags: (0x0018) ACC_STATIC, ACC_FINAL
    ConstantValue: 1

  java.lang.String string;
    descriptor: Ljava/lang/String;
    flags: (0x0000) 

  public void <init>(java.lang.String, int);
    descriptor: (Ljava/lang/String;I)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=3, args_size=3
        start local 0 // javassist.bytecode.Utf8Info this
        start local 1 // java.lang.String utf8
        start local 2 // int index
         0: .line 2135
            aload 0 /* this */
            iload 2 /* index */
            invokespecial javassist.bytecode.ConstInfo.<init>:(I)V
         1: .line 2136
            aload 0 /* this */
            aload 1 /* utf8 */
            putfield javassist.bytecode.Utf8Info.string:Ljava/lang/String;
         2: .line 2137
            return
        end local 2 // int index
        end local 1 // java.lang.String utf8
        end local 0 // javassist.bytecode.Utf8Info this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    3     0   this  Ljavassist/bytecode/Utf8Info;
            0    3     1   utf8  Ljava/lang/String;
            0    3     2  index  I
    MethodParameters:
       Name  Flags
      utf8   
      index  

  public void <init>(java.io.DataInputStream, int);
    descriptor: (Ljava/io/DataInputStream;I)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=3, args_size=3
        start local 0 // javassist.bytecode.Utf8Info this
        start local 1 // java.io.DataInputStream in
        start local 2 // int index
         0: .line 2142
            aload 0 /* this */
            iload 2 /* index */
            invokespecial javassist.bytecode.ConstInfo.<init>:(I)V
         1: .line 2143
            aload 0 /* this */
            aload 1 /* in */
            invokevirtual java.io.DataInputStream.readUTF:()Ljava/lang/String;
            putfield javassist.bytecode.Utf8Info.string:Ljava/lang/String;
         2: .line 2144
            return
        end local 2 // int index
        end local 1 // java.io.DataInputStream in
        end local 0 // javassist.bytecode.Utf8Info this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    3     0   this  Ljavassist/bytecode/Utf8Info;
            0    3     1     in  Ljava/io/DataInputStream;
            0    3     2  index  I
    Exceptions:
      throws java.io.IOException
    MethodParameters:
       Name  Flags
      in     
      index  

  public int hashCode();
    descriptor: ()I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // javassist.bytecode.Utf8Info this
         0: .line 2148
            aload 0 /* this */
            getfield javassist.bytecode.Utf8Info.string:Ljava/lang/String;
            invokevirtual java.lang.String.hashCode:()I
            ireturn
        end local 0 // javassist.bytecode.Utf8Info this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Ljavassist/bytecode/Utf8Info;

  public boolean equals(java.lang.Object);
    descriptor: (Ljava/lang/Object;)Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // javassist.bytecode.Utf8Info this
        start local 1 // java.lang.Object obj
         0: .line 2153
            aload 1 /* obj */
            instanceof javassist.bytecode.Utf8Info
            ifeq 3
         1: .line 2154
            aload 1 /* obj */
            checkcast javassist.bytecode.Utf8Info
            getfield javassist.bytecode.Utf8Info.string:Ljava/lang/String;
            aload 0 /* this */
            getfield javassist.bytecode.Utf8Info.string:Ljava/lang/String;
            invokevirtual java.lang.String.equals:(Ljava/lang/Object;)Z
            ifeq 3
         2: .line 2153
            iconst_1
            ireturn
      StackMap locals:
      StackMap stack:
         3: iconst_0
            ireturn
        end local 1 // java.lang.Object obj
        end local 0 // javassist.bytecode.Utf8Info this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    4     0  this  Ljavassist/bytecode/Utf8Info;
            0    4     1   obj  Ljava/lang/Object;
    MethodParameters:
      Name  Flags
      obj   

  public int getTag();
    descriptor: ()I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // javassist.bytecode.Utf8Info this
         0: .line 2158
            iconst_1
            ireturn
        end local 0 // javassist.bytecode.Utf8Info this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Ljavassist/bytecode/Utf8Info;

  public int copy(javassist.bytecode.ConstPool, javassist.bytecode.ConstPool, java.util.Map<java.lang.String, java.lang.String>);
    descriptor: (Ljavassist/bytecode/ConstPool;Ljavassist/bytecode/ConstPool;Ljava/util/Map;)I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=4, args_size=4
        start local 0 // javassist.bytecode.Utf8Info this
        start local 1 // javassist.bytecode.ConstPool src
        start local 2 // javassist.bytecode.ConstPool dest
        start local 3 // java.util.Map map
         0: .line 2164
            aload 2 /* dest */
            aload 0 /* this */
            getfield javassist.bytecode.Utf8Info.string:Ljava/lang/String;
            invokevirtual javassist.bytecode.ConstPool.addUtf8Info:(Ljava/lang/String;)I
            ireturn
        end local 3 // java.util.Map map
        end local 2 // javassist.bytecode.ConstPool dest
        end local 1 // javassist.bytecode.ConstPool src
        end local 0 // javassist.bytecode.Utf8Info this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Ljavassist/bytecode/Utf8Info;
            0    1     1   src  Ljavassist/bytecode/ConstPool;
            0    1     2  dest  Ljavassist/bytecode/ConstPool;
            0    1     3   map  Ljava/util/Map<Ljava/lang/String;Ljava/lang/String;>;
    Signature: (Ljavassist/bytecode/ConstPool;Ljavassist/bytecode/ConstPool;Ljava/util/Map<Ljava/lang/String;Ljava/lang/String;>;)I
    MethodParameters:
      Name  Flags
      src   
      dest  
      map   

  public void write(java.io.DataOutputStream);
    descriptor: (Ljava/io/DataOutputStream;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // javassist.bytecode.Utf8Info this
        start local 1 // java.io.DataOutputStream out
         0: .line 2171
            aload 1 /* out */
            iconst_1
            invokevirtual java.io.DataOutputStream.writeByte:(I)V
         1: .line 2172
            aload 1 /* out */
            aload 0 /* this */
            getfield javassist.bytecode.Utf8Info.string:Ljava/lang/String;
            invokevirtual java.io.DataOutputStream.writeUTF:(Ljava/lang/String;)V
         2: .line 2173
            return
        end local 1 // java.io.DataOutputStream out
        end local 0 // javassist.bytecode.Utf8Info this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Ljavassist/bytecode/Utf8Info;
            0    3     1   out  Ljava/io/DataOutputStream;
    Exceptions:
      throws java.io.IOException
    MethodParameters:
      Name  Flags
      out   

  public void print(java.io.PrintWriter);
    descriptor: (Ljava/io/PrintWriter;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // javassist.bytecode.Utf8Info this
        start local 1 // java.io.PrintWriter out
         0: .line 2177
            aload 1 /* out */
            ldc "UTF8 \""
            invokevirtual java.io.PrintWriter.print:(Ljava/lang/String;)V
         1: .line 2178
            aload 1 /* out */
            aload 0 /* this */
            getfield javassist.bytecode.Utf8Info.string:Ljava/lang/String;
            invokevirtual java.io.PrintWriter.print:(Ljava/lang/String;)V
         2: .line 2179
            aload 1 /* out */
            ldc "\""
            invokevirtual java.io.PrintWriter.println:(Ljava/lang/String;)V
         3: .line 2180
            return
        end local 1 // java.io.PrintWriter out
        end local 0 // javassist.bytecode.Utf8Info this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    4     0  this  Ljavassist/bytecode/Utf8Info;
            0    4     1   out  Ljava/io/PrintWriter;
    MethodParameters:
      Name  Flags
      out   
}
SourceFile: "ConstPool.java"