Javatext1

import java.util.Scanner;
class text3
{
    public static void main(String []args)
    {
        Scanner sc = new Scanner(System.in);

        System.out.println("input name:");
        String name = sc.next();

        System.out.println("input age:");
        int age = sc.nextInt();

        Person p = new Person(name,age);
        p.introduce();

        Person p1 = new Person();       
        p1.introduce();
    }
}

class Person
{
    private  String name;
    private int age ;

    public Person()
    {

    }

    public  Person(String name , int age )
    {
        this.name = name ;
        this.age = age ; 
    }


    public void  introduce()
    {
        System.out.println("name:"+ this.name + " ,age: " + this.age);
    }

    public String getName()
    {
        return this.name;
    }

    public int getAge()
    {
        return this.age;
    }

    public void  setName(String name)
    {
        this.name = name;
    }

    public void setAge(int age)
    {
        if (age <0)
             System.out.println("age error");
        else
            this.age = age;
    }

}

运行结果如下：