对象的克隆

实体类Teacher

public class Teacher implements Cloneable{private String name ;public Teacher(String name) {  this.name = name ;}public String getName() {  return name;}public void setName(String name) {  this.name = name;}@Overridepublic Teacher clone() throws CloneNotSupportedException {  return (Teacher)super.clone();}}

实体类Student

public class Student implements Cloneable{private String name ;private int age ;private Teacher teacher ;public Student(String name, int age, Teacher teacher) {this.name = name ;this.age = age ;this.teacher = teacher ;}@Overridepublic Student clone() throws CloneNotSupportedException {Student copy = null ;copy = (Student)super.clone();copy.teacher = this.teacher.clone();return copy ;}public String getName() {return name;}public void setName(String name) {this.name = name;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}public Teacher getTeacher() {return teacher;}public void setTeacher(Teacher teacher) {this.teacher = teacher;}}

测试程序

public class CloneTest {/*** @param args*/public static void main(String[] args) {Student student = new Student("wujinbo",20,new Teacher("Hello"));try {Student copy = student.clone();//更改数据源的数据student.setName("冷漠");student.setAge(100);student.getTeacher().setName("Hi");//查看两份数据的差异System.out.println(student.getName()+"-->"+copy.getName());System.out.println(student.getAge()+"-->"+copy.getAge());System.out.println(student.getTeacher().getName()+"-->"+copy.getTeacher().getName());} catch (CloneNotSupportedException e) {e.printStackTrace();}}}