Java封装

class BigPerson{private String name;private int age;void talk(){System.out.println("My name is "+ name +" and my age is "+age);}public  void setName(String string){name = string;}public void setAge(int aage){if(aage>=0)age = aage;}public String getNameString(){return name;}public int getAge(){return age;}}public class Person {public static void main(String args[]){BigPerson person = new BigPerson();person.setAge(-15);person.setName("Hou");person.talk();}}

BigPerson person = new BigPerson();声明并实例化一个BigPerson对象

如果此时将talk()方法设置为private：

private void talk(){System.out.println("My name is "+ name +" and my age is "+age);}

同时再添加一个say()方法：

void say(){this.talk();}

便是在类内部调用方法。

此时person.talk();改为person.say();