Using Unsafe to break encapsulation - step 3

Step3.java

    public final static String buildUnsafe(char[] chars){
        String mutable = new String();// an empty string to hack
        UnsafeAccess.unsafe.putObject(mutable,valueFieldOffset,chars);
        UnsafeAccess.unsafe.putInt(mutable,countFieldOffset,chars.length);
        return mutable;
    }
    public final static String buildUnsafe(char[] chars, int offset, int length){
        String mutable = new String();// an empty string to hack
        UnsafeAccess.unsafe.putObject(mutable,valueFieldOffset,chars);
        UnsafeAccess.unsafe.putInt(mutable,countFieldOffset,length);
        UnsafeAccess.unsafe.putInt(mutable,offsetFieldOffset,offset);
        return mutable;
    }
    public final static char[] getChars(String s){
        return (char[])UnsafeAccess.unsafe.getObject(s,valueFieldOffset);
    }
    public final static int getOffset(String s){
        return UnsafeAccess.unsafe.getInt(s,offsetFieldOffset);
    }

for the blog post here: http://psy-lob-saw.blogspot.co.uk/2012/10/breaking-string-encapsulation-using.html