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public class Test {

public static void main(String[] args) {

Test test = new Test();
test.arrayTest();
}

public void arrayTest() {
Object[] os = new Object[10];
os[0] = new Person("A");

Person per1 = (Person) os[0];
Person per2 = (Person) os[0];
Person per3 = per1;

per1.setName("B");
per1 = null;
os[0] = null;
System.out.println(per1);
System.out.println(per2);
System.out.println(per3);
}
}

class Person {
private String name;

public Person(String name) {
this.name = name;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public String toString() {
return this.name;
}
}
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null
B
B

---

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Java code:

per1 = null;
os[0] = null;
per2 = new Person("A");
per3 = new Person("A");

---

Person per1 = (Person) os[0]; //Ö¸Ïò ¡°os[0]Ö¸ÏòµÄÄÚ´æÇøÓò¡±
Person per2 = (Person) os[0];  //Ö¸Ïò ¡°os[0]Ö¸ÏòµÄÄÚ