30天学会JAVA—练习题(2021韩顺平)——Day6
9.代码
public class Music {
String name;
int times;
public Music(String name, int times){
this.name = name;
this.times = times;
}
public void play(int i){
//i为播放时长
System.out.println("音乐"+ name + "正在播放，" + "播放时长为" + i + "，剩余时长为" + (times - i));
}
public void getInfo(){
System.out.println("音乐名称："+ name);
System.out.println("音乐时长："+ times);
}
public static void main(String[] args) {
Music m1 = new Music("JAVA进行曲", 12);
m1.play(10);
m1.getInfo();
}
}
10. 输出结果为：101，100，101，101
11.代码
public class Method {
public double method(double a, double b){
double c = a + b;
return c;
}
public double method(double a, int b){
double c = a + b;
return c;
}
public static void main(String[] args) {
Method m = new Method();
System.out.println(m.method(m.method(10.0, 20.0), 100));
}
}
12.代码
public class Employee {
String name;
int sex;
int age;
String position;
double salary;
public Employee(String name,int sex,int age,String position,double salary){
this.name = name;
this.sex = sex;
this.age = age;
this.position = position;
this.salary = salary;
}
public Employee(String name,int sex,int age){
this.name = name;
this.sex = sex;
this.age = age;
}
public Employee(String position,double salary){
this.position = position;
this.salary = salary;
}
public static void main(String[] args) {
Employee e1 = new Employee("张三", 1, 12, "职员", 2000);
Employee e2 = new Employee("张三", 1, 12);
Employee e3 = new Employee("职员", 2000);
}
}
13. 代码
class Circle {
public String findArea(double radius){
return "半径为："+ radius +",面积为："+Math.PI * radius *radius;
}
}
public class PassObject {
public void printAreas(Circle c, int times){
for(int i = 1; i <= times; i++){
System.out.println(c.findArea(i));
}
}
public static void main(String[] args) {
PassObject p = new PassObject();
p.printAreas(new Circle(), 5);
}
}
自己写的
public class Tom {
int sum = 0;
public int win(int[] computer, int[] tom){
for(int i = 0; i < tom.length; i++){
System.out.println("电脑：" + computer[i] + " ,Tom:" + tom[i]);
if( (computer[i] == 0 && tom[i] == 2) || (computer[i] == 1 && tom[i] == 0)|| (computer[i] == 2 && tom[i] == 1)){
System.out.print("赢一次：");
sum++;
}
}
System.out.println("Tom赢的次数为：" + sum);
return sum;
}
public static void main(String[] args) {
Tom t = new Tom();
int[] computer= new int[]{
0,1,2,1,2,0};
int[] tom= new int[]{
1,2,1,0,1,1};
t.win(computer, tom);
}
}
老师写的
import java.util.Random;
import java.util.Scanner;
/* 请编写一个猜拳的游戏 有个人 Tom，设计他的成员变量. 成员方法, 可以电脑猜拳. 电脑每次都会随机生成 0, 1, 2 0 表示 石头 1 表示剪刀 2 表示 布 并要可以显示 Tom的输赢次数（清单）, 假定 玩三次. */
// 测试类,主类
public class MoraGame {
// 测试
public static void main(String[] args) {
// 创建一个玩家对象
Tom t = new Tom();
// 用来记录最后输赢的次数
int isWinCount = 0;
// 创建一个二维数组，用来接收局数，Tom出拳情况以及电脑出拳情况
int[][] arr1 = new int[3][3];
int j = 0;
// 创建一个一维数组，用来接收输赢情况
String[] arr2 = new String[3];
Scanner scanner = new Scanner(System.in);
for (int i = 0; i < 3; i++) {
//比赛3次
// 获取玩家出的拳
System.out.println("请输入你要出的拳（0-拳头，1-剪刀，2-布）：");
int num = scanner.nextInt();
t.setTomGuessNum(num);
int tomGuess = t.getTomGuessNum();
arr1[i][j + 1] = tomGuess;
// 获取电脑出的拳
int comGuess = t.computerNum();
arr1[i][j + 2] = comGuess;
// 将玩家猜的拳与电脑做比较
String isWin = t.vsComputer();
arr2[i] = isWin;
arr1[i][j] = t.count;
// 对每一局的情况进行输出
System.out.println("=========================================");
System.out.println("局数\t玩家的出拳\t电脑的出拳\t输赢情况");
System.out.println(t.count + "\t" + tomGuess + "\t\t" + comGuess + "\t\t" + t.vsComputer());
System.out.println("=========================================");
System.out.println("\n\n");
isWinCount = t.winCount(isWin);
}
scanner.close();
// 对游戏的最终结果进行输出
System.out.println("局数\t玩家的出拳\t电脑的出拳\t\t输赢情况");
for (int a = 0; a < arr1.length; a++) {
for (int b = 0; b < arr1[a].length; b++) {
System.out.print(arr1[a][b] + "\t\t\t");
}
System.out.print(arr2[a]);
System.out.println();
}
System.out.println("你赢了" + isWinCount + "次");
}
}
// Tom类
class Tom {
// 核心代码
// 玩家出拳的类型
int tomGuessNum; //0,1,2
// 电脑出拳的类型
int comGuessNum; //0,1,2
// 玩家赢的次数
int winCountNum;
// 比赛的次数
int count = 1; //一共比赛3次
public void showInfo() {
//....
}
/** * 电脑随机生成猜拳的数字的方法 * @return */
public int computerNum() {
Random r = new Random();
comGuessNum = r.nextInt(3); // 方法 返回 0-2的随机数
// System.out.println(comGuessNum);
return comGuessNum;
}
/** * 设置玩家猜拳的数字的方法 * @param tomGuessNum */
public void setTomGuessNum(int tomGuessNum) {
if (tomGuessNum > 2 || tomGuessNum < 0) {
//抛出一个异常, 李同学会写，没有处理
throw new IllegalArgumentException("数字输入错误");
}
this.tomGuessNum = tomGuessNum;
}
public int getTomGuessNum() {
return tomGuessNum;
}
/** * 比较猜拳的结果 * @return 玩家赢返回true，否则返回false */
public String vsComputer() {
//比较巧
if (tomGuessNum == 0 && comGuessNum == 1) {
return "你赢了";
} else if (tomGuessNum == 1 && comGuessNum == 2) {
return "你赢了";
} else if (tomGuessNum == 2 && comGuessNum == 0) {
return "你赢了";
} else if (tomGuessNum == comGuessNum){
return "平手";
} else {
return "你输了";
}
}
/** * 记录玩家赢的次数 * @return */
public int winCount(String s) {
count++; //控制玩的次数
if (s.equals("你赢了")) {
//统计赢的次数
winCountNum++;
}
return winCountNum;
}
}
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