clone.java

孙鑫JAVA从入门到精通配套练习程序。所有程序都实际运行过

//演示clone()方法。
class CloneTest
{
	public static void main(String[] args)
	{
		Professor p = new Professor("wangwu", 50);
		Student s1 = new Student("zhangshan", 18, p);			
		Student s2;																		
		s2 = (Student)s1.clone();																					
		s2.name = "lisi";																					
		s2.age = 20;			
		s2.p.name = "kkk";
		s2.p.age = 30;																		
		System.out.println(s1);	
		System.out.println(s2);
	}																				
	
}

class Professor implements Cloneable
{
	String name;
	int age;
	Professor(String name, int age)
	{
		this.name = name;
		this.age = age;
	}
	public Object clone()
	{
		Object o = null;
		try
		{
			o = super.clone();
		}
		catch(CloneNotSupportedException ex)
		{
			ex.printStackTrace();
		}
		return o;
	}
	
}

class Student implements Cloneable
{
	String name;
	int age;
	Professor p;
	Student(String name, int age, Professor p)
	{
		this.name = name;
		this.age = age;
		this.p = p;
	}
	public String toString()
	{
		return "Student' Informatioin "+ name + ", " + age
				+"\nProfessor's Information " + p.name + "," + p.age;
	}
	public Object clone()
	{
		Student o = null;
		try
		{
			o = (Student)super.clone();
		}
		catch(CloneNotSupportedException ex)
		{
			ex.printStackTrace();
		}
		o.p = (Professor)p.clone();
		return o;
	}
}