第1题

题目：

运行结果：

代码如下：

package work1;public class Vehicles {protected String brand;protected String color;public Vehicles() {// TODO Auto-generated constructor stub}public Vehicles(String brand, String color) {super();this.brand = brand;this.color = color;}public void run() {System.out.println("我已经开动了");}public void showInfo() {System.out.println("商标：" + this.brand);System.out.println("颜色：" + this.color);}}

package work1;public class Car extends Vehicles {private int seats;// 座位数public Car() {// TODO Auto-generated constructor stub}public Car(String brand, String color, int seats) {super(brand, color);this.seats = seats;}public void showCar() {super.showInfo();System.out.println("座位数："+this.seats);}}

package work1;public class Truck extends Vehicles {private float load;// 载重public Truck() {// TODO Auto-generated constructor stub}public Truck(String brand, String color, float load) {super(brand, color);this.load = load;}public void showTruck() {super.showInfo();System.out.println("载重：" + this.load+"吨");}
}

package work1;public class Test {public static void main(String[] args) {// TODO Auto-generated method stubVehicles v = new Vehicles("品牌1", "颜色1");v.showInfo();System.out.println("-------------");Car c = new Car("宝马", "白色", 5);c.showCar();System.out.println("-------------");Truck t = new Truck("解放", "橙色", 30.5F);t.showTruck();}}

第2题

题目：

运行结果：

代码如下：

package work2;public class Pet {protected String nickname;protected int healthValue;public Pet() {// TODO Auto-generated constructor stub}public Pet(String nickname, int healthValue) {super();this.nickname = nickname;this.healthValue = healthValue;}public void eat() {}public void show() {System.out.println("昵称：" + this.nickname);System.out.println("健康值：" + this.healthValue);}}

package work2;public class Dog extends Pet {private String strain;// 品种public Dog() {}public Dog(String nickname, int healthValue, String strain) {super(nickname, healthValue);this.strain = strain;}@Overridepublic void eat() {System.out.println("狗吃骨头");}public void playFrisbee() {System.out.println("玩飞盘");}public void GetIll() {this.healthValue /= 2;System.out.println("生病了");}
}

package work2;public class Cat extends Pet {public Cat() {}public Cat(String nickname, int healthValue) {super(nickname, healthValue);}@Overridepublic void eat() {System.out.println("猫吃鱼");}
}

package work2;public class Test {public static void main(String[] args) {Dog d = new Dog("大白",98,"哈士奇");d.show();d.eat();System.out.println("-------------");Cat c = new Cat("喵喵",90);c.show();c.eat();System.out.println("-------------");}}

第3题

题目：

运行结果：

代码如下：

package work3;public abstract class Vehicle {protected String brand;protected String color;public Vehicle() {}public Vehicle(String brand, String color) {super();this.brand = brand;this.color = color;}public void show() {System.out.println("品牌：" + this.brand);System.out.println("颜色：" + this.color);}public abstract String countOfWheels();// 使它返回一个字符串值。}

package work3;public class Car extends Vehicle {public Car() {}public Car(String brand, String color) {super();this.brand = brand;this.color = color;}public String countOfWheels() {String sCar = "这是小汽车hglerglehr";return sCar;}}

package work3;public class Motorbike extends Vehicle {public Motorbike() {}public Motorbike(String brand, String color) {super();this.brand = brand;this.color = color;}public String countOfWheels() {String sCar = "这是摩托车jhgd;ge;rge";return sCar;}}

package work3;public class Test {public static void main(String[] args) {Car c = new Car("宝马", "白色");c.show();System.out.println(c.countOfWheels());System.out.println("----------------");Motorbike m = new Motorbike("哈雷", "黑色");m.show();System.out.println(m.countOfWheels());}}

第4题

题目：

运行结果：

代码如下：

package work4;public class BankCard {protected String cardNumber;// 卡号protected String passWord;// 密码protected String name;// 姓名protected double balance;// 余额public BankCard() {}public BankCard(String cardNumber, String passWord, String name, double balance) {super();this.cardNumber = cardNumber;this.passWord = passWord;this.name = name;this.balance = balance;}public void withdrawMoney(double money) {// 取款if (balance >= money) {this.balance -= money;System.out.println("取款成功");} else {System.out.println("余额不足，取款失败");}}public void infoShow() {// 查询信息System.out.println("卡号：" + this.cardNumber);System.out.println("姓名：" + this.name);System.out.println("余额：" + this.balance);}}

package work4;public class TheBankCard extends BankCard {public TheBankCard() {}public TheBankCard(String cardNumber, String passWord, String name, double balance) {super();this.cardNumber = cardNumber;this.passWord = passWord;this.name = name;this.balance = balance;}// 取款方法继承父类BankCardpublic void transfer(double money) {// 转账if (balance >= money) {this.balance -= money;System.out.println("转账成功，本次不收取手续费");} else {System.out.println("余额不足，转账失败");}}
}

package work4;public class OtherBankcards extends BankCard {public OtherBankcards() {}public OtherBankcards(String cardNumber, String passWord, String name, double balance) {super();this.cardNumber = cardNumber;this.passWord = passWord;this.name = name;this.balance = balance;}public void withdrawMoney(double money) {// 取款（加收2元手续费）if (this.balance >= money + 2) {super.withdrawMoney(money);System.out.println("取款成功，收取2元手续费");} else {System.out.println("余额不足，取款失败");}}}

package work4;import java.util.Scanner;public class Test {public static void main(String[] args) {TheBankCard tbc = new TheBankCard("53957392463", "123456", "张三", 369534.92);tbc.infoShow();Scanner input = new Scanner(System.in);System.out.print("请输入取款金额：");tbc.withdrawMoney(input.nextDouble());tbc.infoShow();System.out.println("--------------------");System.out.print("请输入转账金额：");tbc.transfer(input.nextDouble());tbc.infoShow();System.out.println("--------------------");OtherBankcards obc = new OtherBankcards("345435937452", "123456", "李四", 43534.65);obc.infoShow();System.out.print("请输入取款金额：");obc.withdrawMoney(input.nextDouble());obc.infoShow();}}

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学习java随堂练习-20220623

目录

第1题

第2题

第3题

第4题

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