Javabase_day07_java一、有以下数据: 1.三个老师信息: 教师编号姓名性别年龄科目 t001薛之谦

知识点：类，封装，this关键字，构造方法

案例一

教师类

package com.hhit.day07.demo01;
/*
 * 三个老师信息：
 * 教师编号		姓名		性别		年龄		科目
 * 	t001		薛之谦	男		26		Java
 * 	t002		张碧晨	女		24		IOS
 * 	t003		张杰		男		28		Java
 */
public class Teacher {
	//教师信息
	private String teacherId;
	private String teacherName;
	private String sex;
	private int age;
	private String subject;
	
	//set,get方法
	public String getTeacherId() {
		return teacherId;
	}
	public void setTeacherId(String teacherId) {
		this.teacherId = teacherId;
	}
	public String getTeacherName() {
		return teacherName;
	}
	public void setTeacherName(String teacherName) {
		this.teacherName = teacherName;
	}
	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 getSubject() {
		return subject;
	}
	public void setSubject(String subject) {
		this.subject = subject;
	}
	
	//无参构造方法
	public Teacher() {}
	//全参构造方法
	public Teacher(String teacherId,String teacherName,String sex,int age,String subject) {
		this.teacherId = teacherId;
		this.teacherName = teacherName;
		this.sex = sex;
		this.age = age;
		this.subject = subject;
	}
}
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——————————

课程类

package com.hhit.day07.demo01;
import java.sql.Time;

/*
 * 存储两个科目信息：
 * 	课程编号		名称		创建时间		课程描述
 * 	s001		Java	2007-02-08	Java学科，包含JavaSE和JavaEE
 * 	s002		IOS		2007-02-09	IOS系统开发
 */
public class Course {
	//科目信息
	private String courseId;
	private String courseName;
	private String startTime;
	private String description;
	//生成set,get方法
	public String getCourseId() {
		return courseId;
	}
	public void setCourseId(String courseId) {
		this.courseId = courseId;
	}
	public String getCourseName() {
		return courseName;
	}
	public void setCourseName(String courseName) {
		this.courseName = courseName;
	}
	public String getStartTime() {
		return startTime;
	}
	public void setStartTime(String startTime) {
		this.startTime = startTime;
	}
	public String getDescription() {
		return description;
	}
	public void setDescription(String description) {
		this.description = description;
	}
	
	//无参构造方法
	public Course() {}
	//全参构造方法
	public Course(String courseId,String courseName,String startTime,String description) {
		this.courseId = courseId;
		this.courseName = courseName;
		this.startTime = startTime;
		this.description = description;
	}
}
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——————————

测试类

package com.hhit.day07.demo01;
/*
 * 测试类
 * 创建相应对象，通过构造方法给成员变量赋值
 */
public class TestDemo01 {
	public static void main(String[] args) {
		//创建对象，通过构造方法给成员变量赋值
		Teacher t1 = new Teacher("t001","薛之谦","男",26,"Java");
		Teacher t2 = new Teacher("t002","张碧晨","女",24,"IOS");
		Teacher t3 = new Teacher("t003","张杰","男",28,"Java");
		//打印每个对象的所有属性
		System.out.println("教师编号："+t1.getTeacherId()+"，姓名："+t1.getTeacherName()+"，"+t1.getSex()+"，科目："+t1.getSubject());
		System.out.println("教师编号："+t2.getTeacherId()+"，姓名："+t2.getTeacherName()+"，"+t2.getSex()+"，科目："+t2.getSubject());
		System.out.println("教师编号："+t2.getTeacherId()+"，姓名："+t3.getTeacherName()+"，"+t3.getSex()+"，科目："+t3.getSubject());
		
		Course c1 = new Course("s001","Java","2007-02-08","Java学科，包含JavaSE和JavaEE");
		Course c2 = new Course("s002","IOS","2007-02-09","IOS系统开发");
		System.out.println("课程编号："+c1.getCourseId()+"，名称："+c1.getCourseName()+"，创建时间："+c1.getStartTime()+"，课程描述："+c1.getDescription());
		System.out.println("课程编号："+c2.getCourseId()+"，名称："+c2.getCourseName()+"，创建时间："+c2.getStartTime()+"，课程描述："+c2.getDescription());

	}
}
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案例二

项目经理类

package com.hhit.day07.demo03;
/*
 * 项目经理类
 * 属性:
 * 		姓名name
 * 		工号id
 * 		工资salary
 * 		奖金bonus
 * 行为：
 * 		工作work()
 */
public class Manager {
	//属性
	private String managerName;
	private String managerId;
	private int salary;
	private int bonus;
	//set,get方法
	public String getManagerName() {
		return managerName;
	}
	public void setManagerName(String managerName) {
		this.managerName = managerName;
	}
	public String getManagerId() {
		return managerId;
	}
	public void setManagerId(String managerId) {
		this.managerId = managerId;
	}
	public int getSalary() {
		return salary;
	}
	public void setSalary(int salary) {
		this.salary = salary;
	}
	public int getBonus() {
		return bonus;
	}
	public void setBonus(int bonus) {
		this.bonus = bonus;
	}
	//无参构造
	public Manager() {}
	//带参构造
	public Manager(String managerName,String managerId,int salary,int bonus) {
		this.managerName = managerName;
		this.managerId = managerId;
		this.salary = salary;
		this.bonus = bonus;
	}
	//行为
	public void work() {
		System.out.println("工号为"+managerId+"基本工资为"+salary+"奖金为"+bonus+"的项目经理正在努力的做着管理工作，分配任务，检查员工提交上来的代码...");
	}
}
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————————————

程序员类

package com.hhit.day07.demo03;
/*
 * 程序员类Coder
 * 属性：
 * 		姓名name
 * 		工号id
 * 		工资salary
 * 行为：
 * 		工作work()
 */
public class Coder {
	//属性
	private String coderName;
	private String coderId;
	private int coderSalary;
	//set,get方法
	public String getCoderName() {
		return coderName;
	}
	public void setCoderName(String coderName) {
		this.coderName = coderName;
	}
	public String getCoderId() {
		return coderId;
	}
	public void setCoderId(String coderId) {
		this.coderId = coderId;
	}
	public int getCoderSalary() {
		return coderSalary;
	}
	public void setCodersalary(int coderSalary) {
		this.coderSalary = coderSalary;
	}
	//无参构造
	public Coder() {}
	//带参构造
	public Coder(String coderName,String coderId,int coderSalary) {
		this.coderName = coderName;
		this.coderId = coderId;
		this.coderSalary = coderSalary;
	}
	
	//行为
	//工作work()
	public void work() {
		System.out.println("工号为"+coderId+"基本工资为"+coderSalary+"的程序员正在努力的写着代码");
	}
}
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————————————

测试类

package com.hhit.day07.demo03;
/*
 * 测试类
 * 在main方法中创建该类的对象并给属性赋值（演示两种方法：setter方法和构造方法）
 * 调用成员方法，打印格式如下
 */
public class TestDemo03 {
	public static void main(String[] args) {
		//创建Manager对象并给属性赋值
		//方式1
		/*Manager manager = new Manager();
		manager.setManagerName("张三");
		manager.setManagerId("01");
		manager.setSalary(15000);
		manager.setBonus(6000);
		*/
		//方式2
		Manager manager = new Manager("张三","01",15000,6000);
		
		//创建Coder对象并给属性赋值，使用方式2
		Coder coder = new Coder("李四","001",10000);
		
		//调用成员方法，打印
		manager.work();
		coder.work();
	}
}
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关键点：类是一组具有相同属性和行为的集合，属性就是成员变量，行为就是成员方法。使用private关键字将属性隐藏起来，只对外提供方法接口，这称为封装。this是当前对象的引用，可以理解为自身。所有类系统都默认给了一个无参的构造方法，若你自己给出带参构造方法，系统就不会提供无参构造，需要我们自己添加，给成员变量赋值有两种方法，一是set方法，二是带参构造，方法二比较方便