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import java.lang.reflect.Field;
import java.util.Date;
import sun.misc.Unsafe;
public class Person {
private int age;
private String name;
private Date birthday;
public Person(String name, int age , Date date) {
super();
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public class A {
public int i=0;
}
public class Testt {
public static void main(String[] args) {
A a =new A();
a.i=1;
chang(a);
System.out.println(a.i);
}
public static void chang(A a){
a.i=2;
a=new A();
a.i=3;
} ......