面向对象

来源：互联网发布：优化排名编辑：程序博客网时间：2024/05/16 15:34

1.创建类

class Person{String name;int age;String tel;/*不带参构造函数*/public Person() {}/*带参构造函数*/public Person(String name, int age, String tel) {super();this.name = name;this.age = age;this.tel = tel;}/*成员方法*/public String getName() {return name;}public void setName(String name) {this.name = name;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}public String getTel() {return tel;}public void setTel(String tel) {this.tel = tel;}}

2.创建对象

类名对象名=new 类名（）；

Person p1=new Person("Jack",23,"0123456789");Person p2=new Person("Ada",21,"9876543210");Person p3=new Person();

3.调用成员方法

p3.setAge(22);p3.setName("July");p3.setTel("99999999999");

4.对象引用

对象引用内存原理图

Person p4=new Person();p4=p1;p4.setName("Andy");

5.代码

public class Test2 {public static void main(String[] args) {// TODO Auto-generated method stubPerson p1=new Person("Jack",23,"0123456789");Person p2=new Person("Ada",21,"9876543210");Person p3=new Person();p3.setAge(22);p3.setName("July");p3.setTel("99999999999");System.out.print("p1\tAge:"+p1.getAge()+"\tname:"+p1.getName()+"\ttel:"+p1.getTel());System.out.println();System.out.print("p2\tAge:"+p2.getAge()+"\tname:"+p2.getName()+"\ttel:"+p2.getTel());System.out.println();System.out.print("p3\tAge:"+p3.getAge()+"\tname:"+p3.getName()+"\ttel:"+p3.getTel());System.out.println();Person p4=new Person();p4=p1;p4.setName("Andy");System.out.print("p1\tAge:"+p1.getAge()+"\tname:"+p1.getName()+"\ttel:"+p1.getTel());System.out.println();}}

6.结果

可以看到对象p3改变了对象p1中的name域

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