/*

* 使per2等于per1，其实是引用，当改变per2的属性时，实质上是改变了per2,per1所共同指向的堆内存里的数据。

*/

package StringClass;

/**

*

* @author zendao

*/

public class CopyAClass {

public static void main(String args[]) {

NewPeople per1 = new NewPeople("lucy", 22); // declare two entity

NewPeople per2;

per2 = per1; // per2 equal per1

per2.setName("James"); // change the attribute of per2

per1.getInfo(); // display and check the result

per2.getInfo();

}

}

/**

* test class

*

* @author zendao

*/

class NewPeople {

private String name; // define test attributes

private int age;

/**

* a constructor

* @param name

* @param age

*/

public NewPeople(String name, int age) {

this.name = name;

this.age = age;

}

/**

* this method for printing the result

* @return

*/

public String getInfo() {

System.out.println("Name of this is :" + this.name + ",and age is :" + this.age);

return null;

}

/**

* this method is for change the attribute

* @param name

*/

public void setName(String name) {

this.name = name;

}

}