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Commit1b4dd3f

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Java第七天
1 parent7b3c6d6 commit1b4dd3f

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1.21 KB
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569 Bytes
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classPhone {
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privateStringbrand;
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privateintprice;
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privateStringcolor;
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publicPhone() {}
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publicPhone(Stringbrand,intprice,Stringcolor) {
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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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publicvoidsetBrand(Stringbrand) {
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this.brand =brand;
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}
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publicStringgetBrand() {
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returnbrand;
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}
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publicvoidsetPrice(intprice) {
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this.price =price;
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}
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publicintgetPrice() {
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returnprice;
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}
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publicvoidsetColor(Stringcolor) {
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this.color =color;
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}
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publicStringgetColor() {
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returncolor;
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}
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publicvoidshow() {
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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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classPhoneTest {
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publicstaticvoidmain(String[]args) {
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//无参+setXxx()
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Phonep =newPhone();
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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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Phonepp =newPhone("华为",799,"白色");
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pp.show();
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}
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}
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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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classStudent {
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//成员变量
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privateStringname;
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privateintage;
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//构造方法
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publicStudent() {
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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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publicStudent(Stringname) {
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this.name =name;
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}
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publicStudent(intage) {
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this.age =age;
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}
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publicStudent(Stringname,intage) {
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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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publicvoidsetName(Stringname) {
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this.name =name;
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}
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publicStringgetName() {
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returnname;
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}
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publicvoidsetAge(intage) {
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this.age =age;
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}
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publicintgetAge() {
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returnage;
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}
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//显示所有成员变量的方法
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publicvoidshow() {
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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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classStudentDemo {
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publicstaticvoidmain(String[]args) {
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//创建对象
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Students =newStudent();
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s.show();
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//创建对象
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Students2 =newStudent("林青霞");
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s2.show();
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//创建对象
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Students3 =newStudent(28);
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s3.show();
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//创建对象
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Students4 =newStudent("林青霞",28);
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s4.show();
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}
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}
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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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classStudent {
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privateStringname;
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privateintage;
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publicStudent() {}
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publicStudent(Stringname,intage) {
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this.name =name;
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this.age =age;
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}
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publicvoidsetName(Stringname) {
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this.name =name;
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}
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publicStringgetName() {
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returnname;
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}
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publicvoidsetAge(intage) {
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this.age =age;
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}
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publicintgetAge() {
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returnage;
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}
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publicvoidshow() {
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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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classStudentTest {
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publicstaticvoidmain(String[]args) {
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//无参+setXxx
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Students1 =newStudent();
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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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Students2 =newStudent("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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}
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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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classMyMath {
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publicintadd(inta,intb) {
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returna +b;
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}
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publicintsubtract(inta,intb) {
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returna -b;
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}
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publicintmultiply(inta,intb) {
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returna *b;
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}
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publicintdivide(inta,intb) {
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returna /b;
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}
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}
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classMyMathDemo {
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publicstaticvoidmain(String[]args) {
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//创建对象
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MyMathmy =newMyMath();
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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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}
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