stringtest.java

Java 程序设计源码 只提供了部分

class StringTest
{
        public static void  main(String[] args) //args 接受命令行参数
        {
                //System.out.println(args[0]);
                Professor p = new Professor("wangwu",50);
                Student s1 = new Student("zhangsan",18,p);
                Student s2 = (Student)s1.clone();
                //s2.name = "lisi";
                //s2.age = 20;
                s2.p.name = "lisi";
                s2.p.age = 30;
                
                //System.out.println("name = " + s1.name + "age = " + s1.age);
                System.out.println("name = " + s1.p.name + "age = " + s1.p.age);
        }
}

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(Exception e)
                {
                       System.out.println(e.toString()); 
                }
                
                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 = (Professor)p.clone();
        }
        
        public Object clone()
        {
                Student o = null;
                try
                {
                        o = (Student)super.clone();
                }
                catch(Exception e)
                {
                       System.out.println(e.toString()); 
                }
                //Professor p = (Professor)p.clone();
                o.p = (Professor)p.clone();
                return o;
        }
}