public class Subject {
    private String name;
    public Subject(String name) {
        this.name = name;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
}
public class Student implements Cloneable {
    private String name;
    private Subject subject;
    public Student(String name, String sub) {
        this.name = name;
        this.subject = new Subject(sub);
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public Subject getSubject() {
        return subject;
    }
    public void setSubject(Subject subject) {
        this.subject = subject;
    }
    //重写父类的方法，这里默认调用父类的拷贝方法
    @Override
    protected Object clone() throws CloneNotSupportedException {
        return super.clone();
    }
}
public class CopyTest {
    public static void main(String[] args) {
        Student student = new Student("yang","haodong");
        try {
            Student studentCopy = (Student) student.clone();
            System.out.println("原对象和拷贝对象是否一致"+( student == studentCopy ) );
            System.out.println("原对象和拷贝对象的name属性是否一样"+(Objects.equals(student.getName(), studentCopy.getName())));
            System.out.println("原对象和拷贝对象的地址属性是否一样"+(student.getSubject() == studentCopy.getSubject()));
            student.setName("li");
            student.getSubject().setName("hao");
            System.out.println("能否更改基本数据类型属性"+studentCopy.getName());
            System.out.println("能否更改引用类型属性"+studentCopy.getSubject().getName());
        } catch (CloneNotSupportedException e) {
            e.printStackTrace();
        }
    }
}
原对象和拷贝对象是否一致false
原对象和拷贝对象的name属性是否一样true
原对象和拷贝对象的地址属性是否一样true
能否更改基本数据类型属性yang
能否更改引用类型属性hao
Process finished with exit code 0

public class Student implements Cloneable {
    private String name;
    private Subject subject;
    public Student(String name, String sub) {
        this.name = name;
        this.subject = new Subject(sub);
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public Subject getSubject() {
        return subject;
    }
    public void setSubject(Subject subject) {
        this.subject = subject;
    }
    @Override
    protected Object clone() throws CloneNotSupportedException {
        return new Student(name,subject.getName());
    }
}
输出结果
原对象和拷贝对象是否一致false
原对象和拷贝对象的name属性是否一样true
原对象和拷贝对象的地址属性是否一样false
能否更改基本数据类型属性yang
能否更改引用类型属性haodong
Process finished with exit code 0