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// Chain generate: generate output words void generate(i n t nwords)
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p r e f i x = new Prefix(NPREF, N N O D ; OWR) f o r ( i n t i = 0; i < nwords; i++) Vector s = (Vector) statetabget(prefix) ; i n t r = Mathabs(randnextInt()) % ssize(); S t r i n g s u f = (String) s elementAt(r) ; i f (suf equal s(NONWORD)) break; Systemout p r i n t l n ( s u f ) ; p r e f i x p r e f removeElementAt(0) ; p r e f i x -p r e f addElement(suf) ;
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The two constructors of P r e f i x create new instances from supplied data The first copies an existing Prefix, and the second creates a prefix from n copies o f a string; we use i t to make NPREF copies of N N O D when initializing: OWR
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// P r e f i x constructor: duplicate e x i s t i n g p r e f i x
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P r e f i x ( P r e f i x p)
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p r e f = (Vector) pprefclone0;
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// P r e f i x constructor: n copies o f s t r
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P r e f i x ( i n t n, S t r i n g s t r )
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p r e f = new Vector(); f o r ( i n t i = 0; i < n; i++) p r e f addElement(str) ;
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Prefix also has two methods, has hCode and equal s, that are called implicitly by the implementation of Hashtabl e to index and search the table I t is the need to have an explicit class for these two methods for Hashtabl e that forced us to make P r e f i x a full-fledged class rather than just a Vector like the suffix The hashcode method builds a single hash value by combining the set of hashcodes for the elements of the vector: s t a t i c f i n a l i n t MULTIPLIER = 31;
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// f o r hashcode0
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// P r e f i x hashcode: generate hash from a l l p r e f i x words p u b l i c i n t hashcode()
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i n t h = 0; f o r ( i n t i = 0; i < prefsize(); i++) h = MULTIPLIER * h + p r e f elementAt(i) hashcode(); r e t u r n h;
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SECTION 35
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JAVA
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and equal s does an elementwise comparison of the words in two prefixes:
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// Prefix equals: compare two prefixes for equal words pub1 i c boolean equal s(0bject o)
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Prefix p = (Prefix) o; f o r ( i n t i = 0; i < prefsize(); i++) i f ( ! pref el ementAt(i) equal s(p pref el ementAt(i))) return f a l s e ; return t r u e ;
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The Java program is significantly smaller than the C program and takes care of more details; Vectors and the Hashtabl e are the obvious examples In general, storage management is easy since vectors grow as needed and garbage collection takes care of reclaiming memory that is no longer referenced But to use the Hashtable class, we still need to write functions hashcode and equals, so Java isn't taking care of all the details Comparing the way the C and Java programs represent and operate on the same basic data structure, we see that the Java version has better separation of functionality For example, to switch from Vectors to arrays would be easy In the C version everything knows what everything else is doing: the hash table operates on arrays that are maintained in various places, 1ookup knows the layout of the State and Suffix structures, and everyone knows the size of the prefix array
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java Markov <jr-chemistry t x t I fmt Wash the blackboard Watch i t dry The water goes i n t o the a i r When water goes i n t o the a i r i t evaporates Tie a damp cloth t o one end of a solid or liquid Look around What are the solid things Chemical changes take place when something burns I f the burning materi a1 has 1i q u i ds, they are stab1e and the sponge r i s e I t looked l i k e dough, but i t i s burning Break up the lump of sugar i n t o small pieces and put them together again i n the bottom of a liquid
Exercise 3-4 Revise the Java version of markov to use an array instead of a Vector for the prefix in the State class