How does java support the concept of destructor?

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Bert Bates and Kathy Sierra's [Head First Java|http://www.amazon.com/exec/obidos/tg/detail/-/0596004656?v=glance ]
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Gosling is the creator of Java. It doesn't get much more authoritative than this.
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Hello all:
I have a Question for Java Assignment operator.
Object v1;
Object v2;
v1 = v2; // Java assignment by reference if I understand correctly
///// for example:
import java.io.*;
import java.util.*;
public class TestOne {
Vector v1;
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How does java support the concept of destructor?

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