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概述
一、定义以下这些接口和类,并完成相关属性和方法的声明和调用。(数据类型,参数列表,返回值类型等根据题目需要自行定义)
(1)学习接口Learning(包含方法:预习preLearn,上课lessons,复习reveiw)
(2)喝酒接口Drinking(包含方法:喝酒drink,吐throwUp,耍酒疯playMad)
(3)人抽象类Person(包含属性:姓名,性别,年龄;抽象方法:谈恋爱love)
学生Student是人,会学习,不能喝酒(因为会使大脑变笨),有自己的学校(school),喜欢和朋友聊微信(chatting)。
公务员Officer是人,不用学习,需要喝酒(经常应酬),经常开一些无聊的会议(meeting)。
程序猿Programmer,是人,经常学习,不喝酒(社交较少),喜欢写代码(coding)和修bug(debuging)。
package behaviordemo;
public interface Learning {
public void preLearn();
public void lessons();
public void reveiw();
}
package behaviordemo;
public interface Drinking {
public void drink();
public void throwUp();
public void playMad();
}
package behaviordemo;
public class TestLearning {
public void operLearn(Learning l) {
l.preLearn();
l.lessons();
l.reveiw();
}
}
package behaviordemo;
public class TestDrinking {
public void operDrink(Drinking d) {
d.drink();
d.throwUp();
d.playMad();
}
}
package behaviordemo;
public class Person {
private String name;
private String sex;
private int age;
public Person() {
}
public Person(String name, String sex, int age) {
this.name = name;
this.sex = sex;
this.age = age;
System.out.println("此人姓名为" + name + ",性别为" + sex + ",年龄为" + age);
}
public void love(String name) {
System.out.println(name + "会谈恋爱...");
}
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;
}
}
package behaviordemo;
public class Student extends Person implements Learning {
public Student() {
}
public void preLearn() {
System.out.println("学生学习需要预习...");
}
public void lessons() {
System.out.println("学生学习需要上课...");
}
public void reveiw() {
System.out.println("学生学习需要复习...");
}
public void school() {
System.out.println("学生有自己的学校...");
}
public void chatting() {
System.out.println("学生喜欢和朋友聊微信...");
}
}
package behaviordemo;
public class Officer extends Person implements Drinking {
public Officer() {
}
public void drink() {
System.out.println("公务员应酬需要喝酒...");
}
public void throwUp() {
System.out.println("公务员喝酒会吐...");
}
public void playMad() {
System.out.println("公务员喝酒会耍酒疯...");
}
public void meeting() {
System.out.println("公务员要开无聊的会议...");
}
}
package behaviordemo;
public class Programmer extends Person implements Learning {
public Programmer() {
}
public void preLearn() {
System.out.println("程序猿学习需要预习...");
}
public void lessons() {
System.out.println("程序猿学习需要上课...");
}
public void reveiw() {
System.out.println("程序猿学习需要复习...");
}
public void coding() {
System.out.println("程序猿特别喜欢写代码...");
}
public void debuging() {
System.out.println("程序猿特别喜欢修bug...");
}
}
package behaviordemo;
public class Test {
public static void main(String[] args) {
TestLearning tl = new TestLearning();
TestDrinking td = new TestDrinking();
Student stu = new Student(); // 实例化学生、公务员、程序猿对象,并向上转型
Officer off = new Officer();
Programmer pro = new Programmer();
stu.love("学生");
tl.operLearn(stu);
stu.school();
stu.chatting();
System.out.println();
off.love("公务员");
td.operDrink(off);
off.drink();
off.playMad();
off.throwUp();
System.out.println();
pro.love("程序猿");
tl.operLearn(pro);
pro.coding();
pro.debuging();
}
}
二、在场景类Client中定义一个方法method1,在形参和实参上体现对象的多态性,在方法中进行调用。
如果对象的实际类型是学生,就和朋友聊微信;
如果是公务员,就去开会;
如果是程序猿,就去写代码和修bug。
package client;
public class Client {
public Client() {
}
}
package client;
public class Student extends Client {
public void chatting() {
System.out.println("学和朋友聊微信。");
}
}
package client;
public class Officer extends Client {
public void meeting() {
System.out.println("公务员开会。");
}
}
package client;
public class Programmer extends Client {
public void coding() {
System.out.println("程序员写代码和修bug。");
}
}
package client;
public class TestClient {
public static void main(String[] args) {
Student stu = new Student();
Officer off = new Officer();
Programmer pro = new Programmer();
method1(stu);
method1(off);
method1(pro);
}
public static void method1(Client cli) {
if (cli == null) {
System.out.println("不能直接传递null!");
return;
}
if (cli instanceof Student) {
Student stu = (Student) cli;
stu.chatting();
}
if (cli instanceof Programmer) {
Programmer pro = (Programmer) cli;
pro.coding();
}
if (cli instanceof Officer) {
Officer off = (Officer) cli;
off.meeting();
}
}
}
三、直接打印一个学生对象,就能以下面格式来输出:
学生信息: 姓名:张三,性别:男,年龄:20,学校:北大)
package inner.print;
public class Student {
// 成员内部类
class Inner {
public void method() {
System.out.println("学生信息: 姓名:张三,性别:男,年龄:20,学校:北大.");
}
}
public Inner get() {
return new Inner();
}
}
package inner.print;
public class TestPrint {
public static void main(String[] args) {
// 方法一
Student stu = new Student();
stu.get().method(); // 通过在外部类中的成员方法中获取内部类对象
/*
* 方法二
* Student.Inner in=stu.new Inner(); // 外部类.内部类 内部类对象=外部类实例.new
* 内部类(); in.method();
*/
}
}
四、如果两个学生的姓名、性别、年龄、学校一样,则认为这两个学生“相等”。
package equal;
public class Student {
private String name;
private String sex;
private int age;
private String school;
public Student() {
}
public Student(String name, String sex, int age, String school) {
this.name = name;
this.sex = sex;
this.age = age;
this.school = school;
}
@Override
public boolean equals(Object obj) {
if (obj == null) {
System.out.println("参数为null,不相等");
return false;
}
if (!(obj instanceof Student)) { // 传递的参数是否属于Student类
System.out.println("传递的不是Student对象");
return false;
}
Student stu = (Student) obj; // 向下转型
if (this.name.equals(stu.name) && this.sex.equals(stu.sex)
&& this.age == stu.age && this.school.equals(stu.school)) {
return true;
}
return false;
}
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 String getSchool() {
return school;
}
public void setSchool(String school) {
this.school = school;
}
}
package equal;
public class TestEqual {
public static void main(String[] args) {
Student stu1 = new Student("张三", "男", 20, "西邮");
Student stu2 = new Student("李四", "男", 20, "西邮");
boolean flag = stu1.equals(stu2);
System.out.println(flag ? "学生1和学生2“相等”" : "学生1和学生2“不相等”");
}
}
Copyright © 2017 Jin Hanquan. All rights reserved.
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