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Java第七天
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‎day07/code/01_构造方法/Phone.class‎

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‎day07/code/01_构造方法/PhoneTest.class‎

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‎day07/code/01_构造方法/PhoneTest.java‎

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class Phone {
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private String brand;
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private int price;
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private String color;
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public Phone() {}
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public Phone(String brand,int price,String color) {
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this.brand = brand;
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this.price = price;
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this.color = color;
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}
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public void setBrand(String brand) {
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this.brand = brand;
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}
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public String getBrand() {
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return brand;
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}
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public void setPrice(int price) {
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this.price = price;
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}
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public int getPrice() {
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return price;
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}
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public void setColor(String color) {
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this.color = color;
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}
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public String getColor() {
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return color;
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}
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public void show() {
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System.out.println("我的手机是："+brand+",价格是："+price+",颜色是："+color);
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}
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}
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class PhoneTest {
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public static void main(String[] args) {
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//无参+setXxx()
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Phone p = new Phone();
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p.setBrand("三星");
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p.setPrice(1000);
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p.setColor("黑色");
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p.show();
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//带参
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Phone pp = new Phone("华为",799,"白色");
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pp.show();
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}
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}

‎day07/code/01_构造方法/StudentDemo.java‎

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/*
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构造方法：给对象的数据进行初始化
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特点：
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A:方法名与类名相同
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B:没有返回值类型，连void都没有
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C:没有具体的返回值
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构造方法的格式：
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修饰符 类名(...) {
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}
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构造方法的注意事项：
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A:如果你不提供构造方法，系统会给出默认无参构造方法
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B:如果你提供了构造方法，系统将不再提供默认无参构造方法
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这个时候，如果你还想继续使用无参构造方法，只能自己给出。
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推荐：永远自己给出无参构造方法。
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C:构造方法也是可以重载的
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D:构造方法中可以有return语句吗?
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可以。只不过是return;
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*/
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class Student {
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//成员变量
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private String name;
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private int age;
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//构造方法
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public Student() {
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System.out.println("我是无参构造方法");
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//return;
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}
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public Student(String name) {
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this.name = name;
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}
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public Student(int age) {
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this.age = age;
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}
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public Student(String name,int age) {
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this.name = name;
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this.age = age;
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}
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//getXxx()/setXxx()方法
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public void setName(String name) {
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this.name = name;
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}
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public String getName() {
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return name;
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}
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public void setAge(int age) {
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this.age = age;
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}
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public int getAge() {
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return age;
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}
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//显示所有成员变量的方法
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public void show() {
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System.out.println("姓名是："+name+",年龄是："+age);
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}
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}
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class StudentDemo {
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public static void main(String[] args) {
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//创建对象
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Student s = new Student();
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s.show();
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//创建对象
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Student s2 = new Student("林青霞");
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s2.show();
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//创建对象
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Student s3 = new Student(28);
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s3.show();
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//创建对象
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Student s4 = new Student("林青霞",28);
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s4.show();
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}
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}

‎day07/code/01_构造方法/StudentTest.java‎

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/*
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类的组成：
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成员变量
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构造方法
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成员方法
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给类的成员变量赋值有几种方式：
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A:setXxx()方法
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B:带参构造方法
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练习：
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Phone:
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成员变量：brand,price,color
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构造方法：无参,带参
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成员方法：setXxx()/getXxx()
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show()
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PhoneTest:
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main
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*/
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class Student {
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private String name;
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private int age;
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public Student() {}
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public Student(String name,int age) {
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this.name = name;
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this.age = age;
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}
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public void setName(String name) {
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this.name = name;
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}
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public String getName() {
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return name;
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}
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public void setAge(int age) {
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this.age = age;
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}
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public int getAge() {
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return age;
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}
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public void show() {
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System.out.println("姓名是："+name+",年龄是："+age);
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}
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}
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class StudentTest {
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public static void main(String[] args) {
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//无参+setXxx
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Student s1 = new Student();
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s1.setName("林青霞");
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s1.setAge(28);
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System.out.println(s1.getName()+"---"+s1.getAge());
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s1.show();
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System.out.println("----------------------------");
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//带参
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Student s2 = new Student("王重阳",82);
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System.out.println(s2.getName()+"---"+s2.getAge());
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s2.show();
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}
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}

‎day07/code/02_对象的初始化过程/一个对象的初始化过程图解.bmp‎

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‎day07/code/03_面向对象练习/加减乘除案例/MyMath.class‎

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‎day07/code/03_面向对象练习/加减乘除案例/MyMathDemo.class‎

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‎day07/code/03_面向对象练习/加减乘除案例/MyMathDemo.java‎

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/*
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定义一个类MyMath,提供基本的加减乘除功能，然后进行测试。
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*/
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class MyMath {
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public int add(int a,int b) {
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return a + b;
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}
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public int subtract(int a,int b) {
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return a - b;
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}
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public int multiply(int a,int b) {
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return a * b;
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}
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public int divide(int a,int b) {
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return a / b;
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}
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}
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class MyMathDemo {
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public static void main(String[] args) {
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//创建对象
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MyMath my = new MyMath();
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System.out.println("加法："+my.add(23,34));
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System.out.println("减法："+my.subtract(23,34));
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System.out.println("乘法："+my.multiply(2,4));
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System.out.println("除法："+my.divide(10,4));
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}
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}

‎day07/code/03_面向对象练习/员工类案例/Employee.class‎

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