練習(xí)一：文字版格斗游戲

需求:

? 格斗游戲，每個(gè)游戲角色的姓名，血量，都不相同，在選定人物的時(shí)候（new對(duì)象的時(shí)候），這些信息就應(yīng)該被確定下來(lái)。

舉例：

? 程序運(yùn)行之后結(jié)果為：

? 姓名為:喬峰 血量為:100

? 姓名為:鳩摩智 血量為:100

? 喬峰舉起拳頭打了鳩摩智一下，造成了XX點(diǎn)傷害，鳩摩智還剩下XXX點(diǎn)血。

? 鳩摩智舉起拳頭打了鳩摩智一下，造成了XX點(diǎn)傷害，喬峰還剩下XXX點(diǎn)血。

? 喬峰舉起拳頭打了鳩摩智一下，造成了XX點(diǎn)傷害，鳩摩智還剩下XXX點(diǎn)血。

? 鳩摩智舉起拳頭打了鳩摩智一下，造成了XX點(diǎn)傷害，喬峰還剩下XXX點(diǎn)血。

? 喬峰K.O.了鳩摩智

代碼示例：

public class GameTest {public static void main(String[] args) {//1.創(chuàng)建第一個(gè)角色Role r1 = new Role("喬峰",100);//2.創(chuàng)建第二個(gè)角色Role r2 = new Role("鳩摩智",100);//3.開(kāi)始格斗 回合制游戲while(true){//r1開(kāi)始攻擊r2r1.attack(r2);//判斷r2的剩余血量if(r2.getBlood() == 0){System.out.println(r1.getName() + " K.O了" + r2.getName());break;}//r2開(kāi)始攻擊r1r2.attack(r1);if(r1.getBlood() == 0){System.out.println(r2.getName() + " K.O了" + r1.getName());break;}}} }public class Role {private String name;private int blood;public Role() {}public Role(String name, int blood) {this.name = name;this.blood = blood;}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;}//定義一個(gè)方法用于攻擊別人//思考：誰(shuí)攻擊誰(shuí)？//Role r1 = new Role（）；//Role r2 = new Role（）；//r1.攻擊(r2);//方法的調(diào)用者去攻擊參數(shù)public void attack(Role role) {//計(jì)算造成的傷害 1 ~ 20Random r = new Random();int hurt = r.nextInt(20) + 1;//剩余血量int remainBoold = role.getBlood() - hurt;//對(duì)剩余血量做一個(gè)驗(yàn)證，如果為負(fù)數(shù)了，就修改為0remainBoold = remainBoold < 0 ? 0 : remainBoold;//修改一下挨揍的人的血量role.setBlood(remainBoold);//this表示方法的調(diào)用者System.out.println(this.getName() + "舉起拳頭，打了" + role.getName() + "一下，" +"造成了" + hurt + "點(diǎn)傷害，" + role.getName() + "還剩下了" + remainBoold + "點(diǎn)血");}}

練習(xí)二：文字版格斗游戲進(jìn)階

? 在上一個(gè)的基礎(chǔ)上，我想看到人物的性別和長(zhǎng)相，打斗的時(shí)候我想看到武功招式。

舉例：

? 程序運(yùn)行之后結(jié)果為：

? 姓名為:喬峰 血量為:100 性別為:男 長(zhǎng)相為:氣宇軒昂

? 姓名為:鳩摩智 血量為:100 性別為:男 長(zhǎng)相為:氣宇軒昂

? 喬峰使出了一招【背心釘】，轉(zhuǎn)到對(duì)方的身后，一掌向鳩摩智背心的靈臺(tái)穴拍去。給鳩摩智造成一處瘀傷。

? 鳩摩智使出了一招【游空探爪】，飛起身形自半空中變掌為抓鎖向喬峰。結(jié)果喬峰退了半步，毫發(fā)無(wú)損。

? 。。。。

? 喬峰K.O.了鳩摩智

分析：

? 長(zhǎng)相是提前定義好的，提前放在一個(gè)數(shù)組當(dāng)中，程序運(yùn)行之后，從數(shù)組中隨機(jī)獲取。

//男生長(zhǎng)相數(shù)組 String[] boyfaces = {"風(fēng)流俊雅", "氣宇軒昂", "相貌英俊", "五官端正", "相貌平平", "一塌糊涂", "面目猙獰"}; //女生長(zhǎng)相數(shù)組 String[] girlfaces = {"美奐絕倫", "沉魚落雁", "婷婷玉立", "身材嬌好", "相貌平平", "相貌簡(jiǎn)陋", "慘不忍睹"};

? 武功招式也是提前定義好的，提前放在一個(gè)數(shù)組當(dāng)中，程序運(yùn)行之后，從數(shù)組隨機(jī)獲取

//attack 攻擊描述： String[] attacks_desc = {"%s使出了一招【背心釘】，轉(zhuǎn)到對(duì)方的身后，一掌向%s背心的靈臺(tái)穴拍去。","%s使出了一招【游空探爪】，飛起身形自半空中變掌為抓鎖向%s。","%s大喝一聲，身形下伏，一招【劈雷墜地】，捶向%s雙腿。","%s運(yùn)氣于掌，一瞬間掌心變得血紅，一式【掌心雷】，推向%s。","%s陰手翻起陽(yáng)手跟進(jìn)，一招【沒(méi)遮攔】，結(jié)結(jié)實(shí)實(shí)的捶向%s。","%s上步搶身，招中套招，一招【劈掛連環(huán)】，連環(huán)攻向%s。"

? 受傷的提前也是提前定義好的，只不過(guò)不是隨機(jī)了，根據(jù)剩余血量獲取不同的描述

//injured 受傷描述： String[] injureds_desc = {"結(jié)果%s退了半步，毫發(fā)無(wú)損","結(jié)果給%s造成一處瘀傷","結(jié)果一擊命中，%s痛得彎下腰","結(jié)果%s痛苦地悶哼了一聲，顯然受了點(diǎn)內(nèi)傷","結(jié)果%s搖搖晃晃，一跤摔倒在地","結(jié)果%s臉色一下變得慘白，連退了好幾步","結(jié)果『轟』的一聲，%s口中鮮血狂噴而出","結(jié)果%s一聲慘叫，像灘軟泥般塌了下去"

? 其中輸出語(yǔ)句跟以前不一樣了，用的是System.out.printf（）；該輸出語(yǔ)句支持%s占位符

public class Test {public static void main(String[] args) {//兩部分參數(shù)：//第一部分參數(shù)：要輸出的內(nèi)容%s（占位）//第二部分參數(shù)：填充的數(shù)據(jù)System.out.printf("你好啊%s","張三");//用張三填充第一個(gè)%sSystem.out.println();//換行System.out.printf("%s你好啊%s","張三","李四");//用張三填充第一個(gè)%s，李四填充第二個(gè)%s} }

最終代碼示例：

package com.itheima.test2;import java.util.Random;public class Role {private String name;private int blood;private char gender;private String face;//長(zhǎng)相是隨機(jī)的String[] boyfaces = {"風(fēng)流俊雅", "氣宇軒昂", "相貌英俊", "五官端正", "相貌平平", "一塌糊涂", "面目猙獰"};String[] girlfaces = {"美奐絕倫", "沉魚落雁", "婷婷玉立", "身材嬌好", "相貌平平", "相貌簡(jiǎn)陋", "慘不忍睹"};//attack 攻擊描述：String[] attacks_desc = {"%s使出了一招【背心釘】，轉(zhuǎn)到對(duì)方的身后，一掌向%s背心的靈臺(tái)穴拍去。","%s使出了一招【游空探爪】，飛起身形自半空中變掌為抓鎖向%s。","%s大喝一聲，身形下伏，一招【劈雷墜地】，捶向%s雙腿。","%s運(yùn)氣于掌，一瞬間掌心變得血紅，一式【掌心雷】，推向%s。","%s陰手翻起陽(yáng)手跟進(jìn)，一招【沒(méi)遮攔】，結(jié)結(jié)實(shí)實(shí)的捶向%s。","%s上步搶身，招中套招，一招【劈掛連環(huán)】，連環(huán)攻向%s。"};//injured 受傷描述：String[] injureds_desc = {"結(jié)果%s退了半步，毫發(fā)無(wú)損","結(jié)果給%s造成一處瘀傷","結(jié)果一擊命中，%s痛得彎下腰","結(jié)果%s痛苦地悶哼了一聲，顯然受了點(diǎn)內(nèi)傷","結(jié)果%s搖搖晃晃，一跤摔倒在地","結(jié)果%s臉色一下變得慘白，連退了好幾步","結(jié)果『轟』的一聲，%s口中鮮血狂噴而出","結(jié)果%s一聲慘叫，像灘軟泥般塌了下去"};public Role() {}public Role(String name, int blood, char gender) {this.name = name;this.blood = blood;this.gender = gender;//隨機(jī)長(zhǎng)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();//長(zhǎng)相是隨機(jī)的if (gender == '男') {//從boyfaces里面隨機(jī)長(zhǎng)相int index = r.nextInt(boyfaces.length);this.face = boyfaces[index];} else if (gender == '女') {//從girlfaces里面隨機(jī)長(zhǎng)相int index = r.nextInt(girlfaces.length);this.face = girlfaces[index];} else {this.face = "面目猙獰";}}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;}//定義一個(gè)方法用于攻擊別人//思考：誰(shuí)攻擊誰(shuí)？//Role r1 = new Role（）；//Role r2 = new Role（）；//r1.攻擊(r2);//方法的調(diào)用者去攻擊參數(shù)public void attack(Role role) {Random r = new Random();int index = r.nextInt(attacks_desc.length);String KungFu = attacks_desc[index];//輸出一個(gè)攻擊的效果System.out.printf(KungFu, this.getName(), role.getName());System.out.println();//計(jì)算造成的傷害 1 ~ 20int hurt = r.nextInt(20) + 1;//剩余血量int remainBoold = role.getBlood() - hurt;//對(duì)剩余血量做一個(gè)驗(yàn)證，如果為負(fù)數(shù)了，就修改為0remainBoold = remainBoold < 0 ? 0 : remainBoold;//修改一下挨揍的人的血量role.setBlood(remainBoold);//受傷的描述//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 (remainBoold > 90) {System.out.printf(injureds_desc[0], role.getName());}else if(remainBoold > 80 && remainBoold <= 90){System.out.printf(injureds_desc[1], role.getName());}else if(remainBoold > 70 && remainBoold <= 80){System.out.printf(injureds_desc[2], role.getName());}else if(remainBoold > 60 && remainBoold <= 70){System.out.printf(injureds_desc[3], role.getName());}else if(remainBoold > 40 && remainBoold <= 60){System.out.printf(injureds_desc[4], role.getName());}else if(remainBoold > 20 && remainBoold <= 40){System.out.printf(injureds_desc[5], role.getName());}else if(remainBoold > 10 && remainBoold <= 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("姓名為：" + getName());System.out.println("血量為：" + getBlood());System.out.println("性別為：" + getGender());System.out.println("長(zhǎng)相為：" + getFace());}}package com.itheima.test2;public class GameTest {public static void main(String[] args) {//1.創(chuàng)建第一個(gè)角色Role r1 = new Role("喬峰",100,'男');//2.創(chuàng)建第二個(gè)角色Role r2 = new Role("鳩摩智",100,'男');//展示一下角色的信息r1.showRoleInfo();r2.showRoleInfo();//3.開(kāi)始格斗 回合制游戲while(true){//r1開(kāi)始攻擊r2r1.attack(r2);//判斷r2的剩余血量if(r2.getBlood() == 0){System.out.println(r1.getName() + " K.O了" + r2.getName());break;}//r2開(kāi)始攻擊r1r2.attack(r1);if(r1.getBlood() == 0){System.out.println(r2.getName() + " K.O了" + r1.getName());break;}}} }

練習(xí)三：對(duì)象數(shù)組（商品）

需求：

? 定義數(shù)組存儲(chǔ)3個(gè)商品對(duì)象。

? 商品的屬性：商品的id，名字，價(jià)格，庫(kù)存。

? 創(chuàng)建三個(gè)商品對(duì)象，并把商品對(duì)象存入到數(shù)組當(dāng)中。

代碼示例：

package com.itheima.test3;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;} }package com.itheima.test3;public class GoodsTest {public static void main(String[] args) {//1.創(chuàng)建一個(gè)數(shù)組Goods[] arr = new Goods[3];//2.創(chuàng)建三個(gè)商品對(duì)象Goods g1 = new Goods("001","華為P40",5999.0,100);Goods g2 = new Goods("002","保溫杯",227.0,50);Goods g3 = new Goods("003","枸杞",12.7,70);//3.把商品添加到數(shù)組中arr[0] = g1;arr[1] = g2;arr[2] = g3;//4.遍歷for (int i = 0; i < arr.length; i++) {//i 索引 arr[i] 元素Goods goods = arr[i];System.out.println(goods.getId() + ", " + goods.getName() + ", " + goods.getPrice() + ", " + goods.getCount());}} }

練習(xí)四：對(duì)象數(shù)組（汽車）

需求：

? 定義數(shù)組存儲(chǔ)3部汽車對(duì)象。

? 汽車的屬性：品牌，價(jià)格，顏色。

? 創(chuàng)建三個(gè)汽車對(duì)象，數(shù)據(jù)通過(guò)鍵盤錄入而來(lái)，并把數(shù)據(jù)存入到數(shù)組當(dāng)中。

代碼示例：

package com.itheima.test5;public class Car {private String brand;//品牌private int price;//價(jià)格private String color;//顏色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;} }package com.itheima.test5;import java.util.Scanner;public class CarTest {public static void main(String[] args) {//1.創(chuàng)建一個(gè)數(shù)組用來(lái)存3個(gè)汽車對(duì)象Car[] arr = new Car[3];//2.創(chuàng)建汽車對(duì)象，數(shù)據(jù)來(lái)自于鍵盤錄入Scanner sc = new Scanner(System.in);for (int i = 0; i < arr.length; i++) {//創(chuàng)建汽車的對(duì)象Car c = new Car();//錄入品牌System.out.println("請(qǐng)輸入汽車的品牌");String brand = sc.next();c.setBrand(brand);//錄入價(jià)格System.out.println("請(qǐng)輸入汽車的價(jià)格");int price = sc.nextInt();c.setPrice(price);//錄入顏色System.out.println("請(qǐng)輸入汽車的顏色");String color = sc.next();c.setColor(color);//把汽車對(duì)象添加到數(shù)組當(dāng)中arr[i] = c;}//3.遍歷數(shù)組for (int i = 0; i < arr.length; i++) {Car car = arr[i];System.out.println(car.getBrand() + ", " + car.getPrice() + ", " + car.getColor());}} }

練習(xí)五：對(duì)象數(shù)組（手機(jī)）

需求 :

? 定義數(shù)組存儲(chǔ)3部手機(jī)對(duì)象。

? 手機(jī)的屬性：品牌，價(jià)格，顏色。

? 要求，計(jì)算出三部手機(jī)的平均價(jià)格

代碼示例：

package com.itheima.test6;public class Phone {private String brand;//品牌private int price;//價(jià)格private String color;//顏色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;} }package com.itheima.test6;import java.math.BigDecimal;public class PhoneTest {public static void main(String[] args) {//1.創(chuàng)建一個(gè)數(shù)組Phone[] arr = new Phone[3];//2.創(chuàng)建手機(jī)的對(duì)象Phone p1 = new Phone("小米",1999,"白色");Phone p2 = new Phone("華為",4999,"藍(lán)色");Phone p3 = new Phone("魅族",3999,"紅色");//3.把手機(jī)對(duì)象添加到數(shù)組當(dāng)中arr[0] = p1;arr[1] = p2;arr[2] = p3;//4.獲取三部手機(jī)的平均價(jià)格int sum = 0;for (int i = 0; i < arr.length; i++) {//i 索引 arr[i] 元素（手機(jī)對(duì)象）Phone phone = arr[i];sum = sum + phone.getPrice();}//5.求平均值//數(shù)據(jù)能不寫死，盡量不寫死//int avg = sum / arr.length;double avg2 = sum * 1.0 / arr.length;System.out.println(avg2);//3665.6666666666665} }

練習(xí)六：對(duì)象數(shù)組（女朋友）

需求：

? 定義數(shù)組存儲(chǔ)4個(gè)女朋友的對(duì)象

? 女朋友的屬性：姓名、年齡、性別、愛(ài)好

? 要求1：計(jì)算出四女朋友的平均年齡

? 要求2：統(tǒng)計(jì)年齡比平均值低的女朋友有幾個(gè)？并把她們的所有信息打印出來(lái)。

代碼示例：

package com.itheima.test7;public class GirlFriend {private String name;//姓名private int age;//年齡private String gender;//性別private String hobby;//愛(ài)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;} }package com.itheima.test7;public class GirlFriendTest {public static void main(String[] args) {//1.定義數(shù)組存入女朋友的對(duì)象GirlFriend[] arr = new GirlFriend[4];//2.創(chuàng)建女朋友對(duì)象GirlFriend gf1 = new GirlFriend("小詩(shī)詩(shī)",18,"萌妹子","吃零食");GirlFriend gf2 = new GirlFriend("小丹丹",19,"萌妹子","玩游戲");GirlFriend gf3 = new GirlFriend("小惠惠",20,"萌妹子","看書，學(xué)習(xí)");GirlFriend gf4 = new GirlFriend("小莉莉",21,"憨妹子","睡覺(jué)");//3.把對(duì)象添加到數(shù)組當(dāng)中arr[0] = gf1;arr[1] = gf2;arr[2] = gf3;arr[3] = gf4;//4.求和int sum = 0;for (int i = 0; i < arr.length; i++) {//i 索引 arr[i] 元素（女朋友對(duì)象）GirlFriend gf = arr[i];//累加sum = sum + gf.getAge();}//5.平均值int avg = sum / arr.length;//6.統(tǒng)計(jì)年齡比平均值低的有幾個(gè)，打印他們的信息int count = 0;for (int i = 0; i < arr.length; i++) {GirlFriend gf = arr[i];if(gf.getAge() < avg){count++;System.out.println(gf.getName() + ", " + gf.getAge() + ", " + gf.getGender() + ", " + gf.getHobby());}}System.out.println(count + "個(gè)");} }

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