Java基础 --- 面向对象综合训练
面向对象综合训练
案例一：文字版格斗游戏
格斗游戏，每个游戏角色的姓名，血量，都不相同，在选定人物的时候（new对象的时候），这些信息就应该被确定下来。
补充：
public class Test {
public static void main(String[] args) {
//两部分参数
//第一部分参数：要输出的内容%s（占位）
//第二部分参数：填充的数据
System.out.printf("你好啊%s","张三");
System.out.println();//printf无法换行，这里做换行处理
System.out.printf("%s你好啊%s","张三","李四");
}
}
正题：
import java.util.Random;
public class Role {
private String name;
private int blood;
private char gender;
private String face;//长相是随机的
String[] boyfaces = {"风流俊雅","器宇轩昂","相貌英俊","五官端正","相貌平平","一塌糊涂","面目狰狞"};
String[] girlfaces = {"美奂绝伦","沉鱼落雁","亭亭玉立","身材姣好","相貌平平","相貌简陋","惨不忍睹"};
//attack攻击描述：
String[] attacks_desc={
"%s使出了一招【背心钉】，转到对方的身后，一掌向%s背心的灵台穴拍去。",
"%s使出了一招【游空探爪】，飞起身形自半空中变掌为抓锁向%s。",
"%s大喝一声，身形下伏，一招【劈雷坠地】，捶向%s双腿。",
"%s运气于掌，一瞬间掌心变得血红，一式 【掌心雷】，推向%s。",
"%s阴手翻起阳手跟进，一招【没遮拦】，结结实实的捶向%s。",
"%s上步抢身，招中套招，一招【劈挂连环】，连环攻向%s。"
};
//injured受伤描述：
String[] injureds_desc={
"结果%s退了半步，毫发无损",
"结果给%s造成一处瘀伤",
"结果一击命中，%s痛得弯下腰",
"结果%s痛苦地闷哼了一声，显然受了点内伤",
"结果%s摇摇晃晃，一跤摔倒在地",
"结果%s脸色一下变得惨白，连退了好几步",
"结果【轰】的一一声，%s口中鲜血狂喷而出",
"结果%s一声惨叫，像滩软泥般塌了下去"
};
public Role(){
}
public Role(String name,int blood,char gender){
this.name = name;
this.blood = blood;
this.gender = gender;
//随机长相
setFace(gender);
}
public char getGender(){
return gender;
}
public void setGender(char gender){
this.gender = gender;
}
public String getFace(){
return face;
}
public void setFace(char gender){
Random r = new Random();
//长相是随机的
if(gender == '男'){
//从boyfaces里面随机
int index = r.nextInt(boyfaces.length);
this.face = boyfaces[index];
} else if (gender == '女') {
//从girlfaces里面随机
int index = r.nextInt(girlfaces.length);
this.face = girlfaces[index];
}else{
this.face = "相貌平平";
}
}
public String getName(){
return name;
}
public void setName(String name){
this.name = name;
}
public int getBlood(){
return blood;
}
public void setBlood(int blood){
this.blood = blood;
}
//定义一个方法用于攻击别人
//方法的调用者去攻击参数
public void attack(Role role){
Random r = new Random();
int index = r.nextInt(attacks_desc.length);
String KungFu = attacks_desc[index];
//输出一个攻击的效果
System.out.printf(KungFu,this.getName(),role.getName());
System.out.println();
//计算造成的伤害1 ~ 20
int hurt = r.nextInt(1,21);
//修改一下挨揍的人的血量
//剩余血量
int remainBlood = role.getBlood() - hurt;
//对剩余血量做一个验证，如果为负数了，就修改为0
remainBlood = remainBlood < 0 ? 0 : remainBlood;
//修改一下挨揍的人的血量
role.setBlood(remainBlood);
//受伤的描述
//血量>90 0索引的描述
//80 ~ 90 1索引的描述
//70 ~ 80 2索引的描述
//60 ~ 70 3索引的描述
//40 ~ 60 4索引的描述
//20 ~ 40 5索引的描述
//10 ~ 20 6索引的描述
//小于10的 7索引的描述
if(remainBlood > 90){
System.out.printf(injureds_desc[0],role.getName());
} else if (remainBlood > 80 && remainBlood <= 90) {
System.out.printf(injureds_desc[1],role.getName());
} else if (remainBlood > 70 && remainBlood <= 80) {
System.out.printf(injureds_desc[2],role.getName());
} else if (remainBlood > 60 && remainBlood <= 70) {
System.out.printf(injureds_desc[3],role.getName());
} else if (remainBlood > 40 && remainBlood <= 60) {
System.out.printf(injureds_desc[4],role.getName());
} else if (remainBlood > 20 && remainBlood <= 40) {
System.out.printf(injureds_desc[5],role.getName());
} else if (remainBlood > 10 && remainBlood <= 20) {
System.out.printf(injureds_desc[6],role.getName());
} else {
System.out.printf(injureds_desc[7],role.getName());
}
System.out.println();
}
public void showRoleInfo(){
System.out.println("姓名为" + getName());
System.out.println("血量:" + getBlood());
System.out.println("性别:" + getGender());
System.out.println("长相" + getFace());
}
}
public class GameTest {
public static void main(String[] args) {
//1.创建第一个角色
Role r1 = new Role("炎拳", 100,'男');
//2.创建第二个角色
Role r2 = new Role("巳蛇",100,'女');
//展示一下角色的信息
r1.showRoleInfo();
r2.showRoleInfo();
//3.开始格斗
while(true){
//r1开始攻击r2
r1.attack(r2);
//判断r2的剩余血量
if(r2.getBlood() == 0){
System.out.println(r1.getName() + "K.O了" + r2.getName());
break;
}
//r2攻击r1
r2.attack(r1);
if(r1.getBlood() == 0){
System.out.println(r2.getName() + "K.O了" + r1.getName());
break;
}
}
}
}
案例二：对象数组练习
对象数组1
定义数组存储3个商品对象。
商品的属性：商品的id，名字，价格，库存。
常见三个商品对象，并把商品对象存入到数组当中。
public class Goods {
private String id;
private String name;
private double price;
private int count;
public Goods(){
}
public Goods(String id,String name,double price,int count){
this.id = id;
this.name = name;
this.price = price;
this.count = count;
}
public String getId(){
return id;
}
public void setId(String id){
this.id = id;
}
public String getName(){
return name;
}
public void setName(String name){
this.name = name;
}
public double getPrice(){
return price;
}
public void setPrice(double price){
this.price = price;
}
public int getCount(){
return count;
}
public void setCount(int count){
this.count = count;
}
}
class GoodsTest {
public static void main(String[] args) {
//1.创建数组
Goods[] arr = new Goods[3];
//2.创建三个商品对象
Goods g1 = new Goods("114514","华为P60",6999.9,100);
Goods g2 = new Goods("10086","烧水壶",248.0,58);
Goods g3 = new Goods("404","帕鲁",555.5,1234);
//3.把商品添加到数组里
arr[0] = g1;
arr[1] = g2;
arr[2] = g3;
//4.遍历
for (int i = 0; i < arr.length; i++) {
Goods goods = arr[i];
System.out.println(goods.getId() + "," + goods.getName() + "," + goods.getPrice() + "," + goods.getCount());
}
}
}
对象数组2
定义数组循序3部汽车对象。
汽车的属性：品牌，价格，颜色。
创建三个汽车对象，数据通过键盘录入而来，并把数据存入到数组当中。
补充：
import java.util.Scanner;
public class Test {
public static void main(String[] args) {
//键盘录入
//第一套体系：
//nextInt();接收整数
//nextDouble();接收小数
//next();接收字符串
//遇到空格，制表符，回车就停止接收，这些符号后面的数据就不会接收了
//第二套体系：
//nextLine();接收字符串
//可以接受空格，制表符，遇到回车才停止接收数据
//键盘录入的两套体系不能混用
//弊端：先用nextInt，再用nextLine会导致下面的nextLine接收不到数据
Scanner sc = new Scanner(System.in);
System.out.println("请输入一个整数");
int num1 = sc.nextInt();//123 1
System.out.println(num1);//123
System.out.println("请输入第二个整数");
int num2 = sc.nextInt();
System.out.println(num2);//1
System.out.println("请输入一个字符串");
String str1 = sc.next();//abc a
System.out.println(str1);//abc
System.out.println("请输入第二个字符串");
String str2 = sc.next();
System.out.println(str2);//a
System.out.println("请输入一个字符串");
String line1 = sc.nextLine();
System.out.println(line1);
System.out.println("请输入二个字符串");
String line2 = sc.nextLine();
System.out.println(line2);
}
}
正题：
public class Car {
private String brand;
private int price;
private String color;
public Car(){
}
public Car(String brand,int price,String color){
this.brand = brand;
this.price = price;
this.color = color;
}
public String getBrand(){
return brand;
}
public void setBrand(String brand){
this.brand = brand;
}
public int getPrice(){
return price;
}
public void setPrice(int price){
this.price = price;
}
public String getColor(){
return color;
}
public void setColor(String color){
this.color = color;
}
}
import java.util.Scanner;
public class CarTest {
public static void main(String[] args) {
Car[] arr = new Car[3];//创建数组
Scanner sc = new Scanner(System.in);//键盘录入
for (int i = 0; i < arr.length; i++) {
Car c = new Car();//创建汽车对象
System.out.println("请输入汽车的品牌");
String brand = sc.next();//录入品牌
c.setBrand(brand);
System.out.println("请输入汽车的价格");
int price = sc.nextInt();//录入价格
c.setPrice(price);
System.out.println("请输入汽车的颜色");
String color = sc.next();//录入颜色
c.setColor(color);
arr[i] = c;//把汽车对象添加到数组当中
}
for (int i = 0; i < arr.length; i++) {
Car car = arr[i];
System.out.println(car.getBrand() + "，" + car.getPrice() + "，" + car.getColor());
}
}
}
对象数组3
定义数组存储3部手机对象。
手机的属性：品牌，价格，颜色。
要求，计算出三部手机的平均价格。
public class Phone {
private String brand;//品牌
private int price;//价格
private String color;//颜色
public Phone(){
}
public Phone(String brand,int price,String color){
this.brand = brand;
this.price = price;
this.color = color;
}
public String getBrand(){
return brand;
}
public void setBrand(String brand){
this.brand = brand;
}
public int getPrice(){
return price;
}
public void setPrice(int price){
this.price = price;
}
public String getColor(){
return color;
}
public void setColor(String color){
this.color = color;
}
}
public class PhoneTest {
public static void main(String[] args) {
//创建一个数组
Phone[] arr = new Phone[3];
//创建手机的对象
Phone p1 = new Phone("鸭梨",2999,"白色");
Phone p2 = new Phone("菠萝",3100,"黄色");
Phone p3 = new Phone("大哥大",1000,"红色");
//把手机对象添加到数组当中
arr[0] = p1;
arr[1] = p2;
arr[2] = p3;
//获取散步手机的平均价格
int sum = 0;
for (int i = 0; i < arr.length; i++) {
Phone phone = arr[i];
sum += phone.getPrice();
}
//求平均值
int avg = sum / arr.length;
System.out.println(avg);
}
}
对象数组4
定义数组存储4个女朋友的对象
女朋友的属性：姓名、年龄、性别、爱好
要求1：计算出四女朋友的平均年龄
要求2：统计年龄比平均值低的女朋友有几个？并把她们的所有信息打印出来。
public class GirlFriend {
private String name;//姓名
private int age;//年龄
private String gender;//性别
private String hobby;//爱好
public GirlFriend(){
}
public GirlFriend(String name,int age,String gender,String hobby){
this.name = name;
this.age = age;
this.gender = gender;
this.hobby = hobby;
}
public String getName(){
return name;
}
public void setName(String name){
this.name = name;
}
public int getAge(){
return age;
}
public void setAge(int age){
this.age = age;
}
public String getGender(){
return gender;
}
public void setGender(String gender){
this.gender = gender;
}
public String GetHobby (){
return hobby;
}
public void setHobby (String hobby){
this.hobby = hobby;
}
}
public class GirlFriendTest {
public static void main(String[] args) {
GirlFriend[] arr = new GirlFriend[4];
GirlFriend g1 = new GirlFriend("柳如烟",18,"女","逛街");
GirlFriend g2 = new GirlFriend("沈江雪",25,"女","医学");
GirlFriend g3 = new GirlFriend("慕容雪",21,"女","书法");
GirlFriend g4 = new GirlFriend("唐嫣",17,"女","绘画");
arr[0] = g1;
arr[1] = g2;
arr[2] = g3;
arr[3] = g4;
int sum = 0;
for (int i = 0; i < arr.length; i++) {
GirlFriend girlFriend = arr[i];
sum += girlFriend.getAge();
}
int avg = sum / arr.length;
System.out.println(avg);
int count = 0;
for (int i = 0; i < arr.length; i++) {
GirlFriend girlFriend = arr[i];
if(girlFriend.getAge() < avg){
count++;
System.out.println(girlFriend.getName() + "," + girlFriend.getAge() + "," + girlFriend.getGender() + "," + girlFriend.GetHobby());
}
}
System.out.println(count);
}
}
对象数组5
定义一个长度为3的数组，数组存储1~3名学生对象作为初始数据，学生对象的学号，姓名各不相同。
学生的属性：学号，姓名，年龄。
要求1：再次添加一一个学生对象，并在添加的时候进行学号的唯一性判断。
要求2：添加完毕之后，遍历所有学生信息。
要求3：通过id删除学生信息
如果存在，则删除，如果不存在，则提示删除失败。
要求4：删除完毕之后，遍历所有学生信息。
要求5：查询数组id为"2” 的学生，如果存在，则将他的年龄+1岁
public class Student {
private int id;
private String name;
private int age;
public Student() {
}
public Student(int id, String name, int age) {
this.id = id;
this.name = name;
this.age = age;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
要求1~要求2：
public class Test {
public static void main(String[] args) {
//创建数组，存储学生对象
Student[] arr = new Student[3];
//创建学生对象，添加到数组当中
Student stu1 = new Student(1,"张三",18);
Student stu2 = new Student(2,"李四",23);
Student stu3 = new Student(3,"王五",20);
//把学生对象添加到数组当中
arr[0] = stu1;
arr[1] = stu2;
arr[2] = stu3;
Student stu4 = new Student(4,"赵六",24);
//唯一性判断
//已存在 --- 不用添加
//不存在 --- 添加
boolean flag = contains(arr,stu4.getId());
if(flag){
//id存在
System.out.println("当前id重复，请修改id后再重新添加");
}else {
//id不存在
//把stu4添加到数组当中
//1.数组已经存满 --- 创建一个新的数组，新数组的长度 = 老数组的长度 + 1
//2.数组没有存满 --- 直接添加
int count = getCount(arr);
if(count == arr.length){
//存满
//创建一个新的数组，新数组的长度 = 老数组的长度 + 1
Student[] newArr = creatNewArr(arr);
newArr[count] = stu4;
printArr(newArr);
}else {
//未存满
arr[count] = stu4;
printArr(arr);
}
}
}
public static void printArr(Student[] arr){//定义方法遍历数组
for (int i = 0; i < arr.length; i++) {
Student stu = arr[i];
if(stu != null){
System.out.println(stu.getId() + "," + stu.getName() + "," + stu.getAge());
}
}
}
public static Student[] creatNewArr(Student[] arr){//创建新数组
Student[] newArr = new Student[arr.length + 1];
for (int i = 0; i < arr.length; i++) {
newArr[i] = arr[i];
}
return newArr;
}
public static int getCount(Student[] arr){//定义方法，判断数组中存了几个元素
int count = 0;//计数器
for (int i = 0; i < arr.length; i++) {
if(arr[i] != null){
count++;
}
}
return count;
}
public static boolean contains(Student[] arr,int id){//定义方法，判断id是否存在
for (int i = 0; i < arr.length; i++) {
//获取数组中每一个学生对象
Student stu = arr[i];
if(stu != null){
//获取数组中学生对象的id
int sid = stu.getId();
if(sid == id){
return true;
}
}
}
return false;
}
}
要求3~要求4：
public class Test1 {
public static void main(String[] args) {
//创建数组，存储学生对象
Student[] arr = new Student[3];
//创建学生对象，添加到数组当中
Student stu1 = new Student(1, "张三", 18);
Student stu2 = new Student(2, "李四", 23);
Student stu3 = new Student(3, "王五", 20);
//把学生对象添加到数组当中
arr[0] = stu1;
arr[1] = stu2;
arr[2] = stu3;
int index = getIndex(arr,2);
if(index >= 0){
//存在，删除
arr[index] = null;
printArr(arr);
}else {
//不存在，删除失败
System.out.println("当前id不存在，删除失败！");
}
}
public static void printArr(Student[] arr){//定义方法遍历数组
for (int i = 0; i < arr.length; i++) {
Student stu = arr[i];
if(stu != null){
System.out.println(stu.getId() + "," + stu.getName() + "," + stu.getAge());
}
}
}
public static int getIndex(Student[] arr,int id){//找到id在数组中的索引
for (int i = 0; i < arr.length; i++) {
Student stu = arr[i];
if(stu != null){
int sid = stu.getId();
if(sid == id){
return i;
}
}
}
return -1;
}
}
要求5：
public class Test2 {
public static void main(String[] args) {
//创建数组，存储学生对象
Student[] arr = new Student[3];
//创建学生对象，添加到数组当中
Student stu1 = new Student(1, "张三", 18);
Student stu2 = new Student(2, "李四", 23);
Student stu3 = new Student(3, "王五", 20);
//把学生对象添加到数组当中
arr[0] = stu1;
arr[1] = stu2;
arr[2] = stu3;
int index = getIndex(arr,2);
if(index >= 0){
//存在，年龄+1
Student stu = arr[index];
int newAge = stu.getAge() + 1;
stu.setAge(newAge);
printArr(arr);
}else {
//不存在，直接提示
System.out.println("当前id不存在，修改失败！");
}
}
public static void printArr(Student[] arr){//定义方法遍历数组
for (int i = 0; i < arr.length; i++) {
Student stu = arr[i];
if(stu != null){
System.out.println(stu.getId() + "," + stu.getName() + "," + stu.getAge());
}
}
}
public static int getIndex(Student[] arr,int id){//找到id在数组中的索引
for (int i = 0; i < arr.length; i++) {
Student stu = arr[i];
if(stu != null){
int sid = stu.getId();
if(sid == id){
return i;
}
}
}
return -1;
}
}