java初学--class extends

最新推荐文章于 2025-07-16 20:17:21 发布

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本文通过具体的Java代码示例介绍了面向对象编程的基本概念，包括类的定义、继承、多态等核心特性，并展示了如何使用这些特性来实现简单的交互逻辑。

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Person.java

public class Person 
{
	int age;
	String name;
	String school;
	Person(String name,int age)
	{
		this.name=name;
		this.age=age;
	}
	Person(String string, int age, String school) 
	{
		this.name=name;
		this.age=age;
		this.school=school;
	}
	void sayHello(Student s) 
	{
		System.out.println("My school is "+school);
	}
    void sayHello()
    {
    	System.out.println("wpx");
    }

}

Student.java

public class Student extends Person
{
	String school;
	int score;
	void sayHello(Student another)
	{
		System.out.println("Hi!");
		if(school==another.school )
			System.out.println(" Shoolmates");
	}
	boolean isGoodStudent()
	{
		return score>=90;
	}
	void testThisSuper()
	{
		int a;
		a=age;
		a=this.age;
		a=super.age;	
	}
	void sayHello()
	{
		super.sayHello();
		System.out.println("My school is "+school);
	}
	Student(String name,int age,String school)
	{
		super(name,age);
		this.school=school;
	}
//	Student()();
	public static void main(String []args)
	{
		Person p=new Person("Liming",50);
		Student s=new Student("Wangqiang",20,"PKU");
		Person p2=new Student("Zhangyi",18,"THU");
//		Student s2=(Student)p2;//强制转换
//		Student s3=(Student)p;
		
		p.sayHello(s);
		Person []manypeople = new Person[100];
		manypeople[0] = new Person("Li",18);
		manypeople[1] = new Person("Wang",18,"PKU");
	}
	

}