1、对象又叫做实例（instance），生成一个对象的过程又叫做实例化。
2、如何定义属性？
public class Person
{
修饰符 类型 属性名称;
}
如何使用属性?
首先需要生成类的实例（对象），然后用实例+“.”的方法使用属性。如
Person person = new Person();
person.age;
public class Person
{
int age ;
boolean flag;
public static void main(String[] args)
{
Person person = new Person();
System.out.println(person.age);
System.out.println(person.flag);
}
}
3、引用
public class People
{
int age = 20;
public void change(People people)
{
people.age = 30;
}
public static void main(String[] args)
{
People people = new People();
int age = people.age;
System.out.println(age);
people.change(people);
int age2 = people.age;
System.out.println(age2);//结果：20 30
}
}
微信截图_20161125085517.png
public class People
{
int age = 20;
public void change(People people)
{
people = new People();
people.age = 30;
}
public static void main(String[] args)
{
People people = new People();
int age = people.age;
System.out.println(age);
people.change(people);
int age2 = people.age;
System.out.println(age2);//结果：20 20
}
}
