int a= 5;
int b= a;  

b = 6;

这样 a == 5, b == 6

class Student {  private int number;  public int getNumber() {  return number;  }  public void setNumber(int number) {  this.number = number;  }  }
public class Test {  public static void main(String args[]) {  Student stu1 = new Student();  stu1.setNumber(12345);  Student stu2 = stu1;  System.out.println("学生1:" + stu1.getNumber());  System.out.println("学生2:" + stu2.getNumber());  }
}结果：学生1:12345
学生2:12345  

class Address implements Cloneable {  private String add;  public String getAdd() {  return add;  }  public void setAdd(String add) {  this.add = add;  }  @Override  public Object clone() {              // 下面 这个是重点Address addr = null;  try{  addr = (Address)super.clone();  }catch(CloneNotSupportedException e) {  e.printStackTrace();  }  return addr;  }
}  

public class Outer implements Serializable{private static final long serialVersionUID = 369285298572941L;  //最好是显式声明IDpublic Inner inner;//Discription:[深度复制方法,需要对象及对象所有的对象属性都实现序列化]　public Outer myclone() {Outer outer = null;try { // 将该对象序列化成流,因为写在流里的是对象的一个拷贝，而原对象仍然存在于JVM里面。所以利用这个特性可以实现对象的深拷贝ByteArrayOutputStream baos = new ByteArrayOutputStream();ObjectOutputStream oos = new ObjectOutputStream(baos);oos.writeObject(this);// 将流序列化成对象ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());ObjectInputStream ois = new ObjectInputStream(bais);outer = (Outer) ois.readObject();} catch (IOException e) {e.printStackTrace();} catch (ClassNotFoundException e) {e.printStackTrace();}return outer;}
}