Lesson_for_java_day11--课堂练习

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练习一：

package sonyi;/*练习：编写一个Java程序，满足以下要求：1、编写一个Car类，具有：属性：品牌(mark)----String类型功能：驾驶(void drive())2、定义Car类的子类SubCar，具有：属性：价格(price)、速度(speed)----int型功能：变速(void speedChange(int speed))，把新速度赋值给speed3、定义主类，在main方法中创建SubCar类的两个对象，bmw和benchi的对象并测试其对象的特性。 */public class CarExercise {public static void main(String[] args) {//实现两个对象SubCar bmw = new SubCar("bmw",100,80);SubCar benz = new SubCar("benz",110,90);System.out.println(bmw);bmw.drive();bmw.speedChange(200);System.out.println(benz);benz.drive();benz.speedChange(250);}}//子类继承父类class SubCar extends Car{private int price;private int speed;SubCar(){}SubCar(String mark,int price,int speed){super(mark);this.price = price;this.speed = speed;}public void speedChange(int speed){System.out.println(getMark() + "现在变速为：" + speed);setSpeed(speed);}@Overridepublic String toString() {return "我是" + getMark() + ",我的价格是：" + price + ", 我现在的速度是：" + speed;}public int getPrice() {return price;}public void setPrice(int price) {this.price = price;}public int getSpeed() {return speed;}public void setSpeed(int speed) {this.speed = speed;}}//父类class Car{private String mark;Car(){}Car(String mark){this.mark = mark;}public void drive(){System.out.println(getMark() + "正在行驶。。。。");}public String getMark() {return mark;}public void setMark(String mark) {this.mark = mark;}}

练习二：

package sonyi;/*练习：编写一个类Calculate1，实现加、减两种运算，然后，编写另一个派生类Calculate2，实现乘、除两种运算。 */public class Calculate {public static void main(String[] args) {// TODO Auto-generated method stubCalculate1 c1 = new Calculate1();Calculate2 c2 = new Calculate2();System.out.println("c1的加法：" + c1.plus(5, 3));System.out.println("c1的减法：" + c1.subtraction(5, 3));System.out.println("c2的加法：" + c2.plus(5, 3));System.out.println("c2的减法：" + c2.subtraction(5, 3));System.out.println("c2的乘法：" + c2.multiply(5, 3));System.out.println("c2的除法：" + c2.remove(5, 3));}}class Calculate1{public double plus(double x,double y){return x + y;}public double subtraction(double x,double y){return x - y;}}class Calculate2 extends Calculate1{public double multiply(double x, double y){return x*y;}public double remove(double x,double y){return x/y;}}

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