java--面向对象之封装（有参构造和无参构造）

不念不忘少年蓝@ 2022-06-04 09:56 212阅读 0赞

package test;  
  
  
public class Person \{  
private String name;  
private String sex;  
private int age;  
  
  
public String getName() \{  
return name;  
\}  
public void setName(String name) \{  
this.name = name;  
\}  
public String getSex() \{  
return sex;  
\}  
public void setSex(String sex) \{  
this.sex = sex;  
\}  
public int getAge() \{  
return age;  
\}  
public void setAge(int age) \{  
this.age = age;  
\}  
public Person(String name, String sex, int age) \{  
this.name = name;  
this.sex = sex;  
this.age = age;  
\}  
public Person() \{  
  
\}  
public void display()\{  
System.out.println("名字："+this.name+" 性别："+this.sex+" 年龄："+this.age);  
\}  
/\*public String show(String name, String sex, int age)\{  
return "名字："+this.name+" 性别："+this.sex+" 年龄："+this.age;  
\}\*/

**Test:**

package test;  
  
  
import org.junit.Test;  
  
  
public class jTest \{  
@Test  
public void test1()\{  
//无参构造  
Person p1=new Person();  
Person p2=new Person();  
Person p3=new Person();  
p1.setName("张三");  
p1.setSex("男");  
p1.setAge(19);  
p2.setName("张");  
p2.setSex("男");  
p2.setAge(19);  
p3.setName("三");  
p3.setSex("男");  
p3.setAge(19);  
//String totle=p1.show("张三","男",19);  
System.out.println("名字："+p1.getName()+" 性别："+p1.getSex()+" 年龄："+p1.getAge());  
System.out.println("名字："+p2.getName()+" 性别："+p2.getSex()+" 年龄："+p2.getAge());  
System.out.println("名字："+p3.getName()+" 性别："+p3.getSex()+" 年龄："+p3.getAge());  
  
  
  
  
  
  
//有参构造  
Person person1=new Person("张三","男",19);  
Person person2=new Person("李四","女",21);  
Person person3=new Person("王五","男",18);  
person1.display();  
person2.display();  
person3.display();  
\}  
\}