package com.opp.homework2.demo1;
public class Demo1 {
public void seasons(int num) {
if (num == 2 || num == 3 || num == 4) {
System.out.println("春季");
}
if (num == 5 || num == 6 || num == 7) {
System.out.println("夏季");
}
if (num == 8 || num == 9 || num == 10) {
System.out.println("秋季");
}
if (num == 12 || num == 11 || num == 1) {
System.out.println("冬季");
}
}
}
package com.opp.homework2.demo1;
import java.util.Scanner;
public class MyMain {
public static void main(String[] args) {
Scanner scanner=new Scanner(System.in);
System.out.println("请输入月份：");
int number=scanner.nextInt();
Demo1 demo1 =new Demo1();
demo1.seasons(number);
}
}
package com.opp.homework2.demo2;
public class MyMain {
public static void main(String[] args) {
QuessMachine qm=new QuessMachine();
qm.initial();
qm.guess();
}
}
package com.opp.homework2.demo2;
import java.util.Scanner;
public class QuessMachine {
int num,guessNum;
public void initial(){
num=(int)(Math.random()*100);
System.out.println(num);
}
public void guess(){
Scanner scanner=new Scanner(System.in);
boolean flag=false;
do {
System.out.println("请输入您的猜测价格：");
guessNum = scanner.nextInt();
if (guessNum > num) {
System.out.println("再小些");
} else if (guessNum < num) {
System.out.println("再大些");
} else {
System.out.println("猜对了");
flag=true;
}
}while (!flag);
}
}
package com.opp.homework2.demo3;
import java.util.Arrays;
public class Demo3 {
public void insertArray(int[] arr, int index, int value) {
int[] newArr = Arrays.copyOf(arr, 8);
for (int i = newArr.length - 1; i > index; i--) {
newArr[i] = newArr[i - 1];
}
newArr[index] = value;
for (int a : newArr) {
System.out.println(a);
}
}
}
/*未想完
package com.opp.homework2.demo3;
import java.util.Scanner;
public class MyMain {
public static void main(String[] args) {
Demo3 demo3 = new Demo3();
int[] arr = {3, 64, 15, 36, 72, 38, 29};
for (int b:arr) {
System.out.println(b);
}
Scanner scanner = new Scanner(System.in);
System.out.println("请输入要插入的位置：");
int index = scanner.nextInt();
System.out.println("请输入要插入的数字：");
int value = scanner.nextInt();
demo3.insertArray(arr, index, value);
}
}
*/
package com.opp.homework2;
import java.util.Scanner;
public class MyMain {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
while (in.hasNextInt()) {
int n = in.nextInt();
int m = in.nextInt();
Student[] stu = new Student[n]; //创建n个学生对象的数组
double[] avg = new double[m]; //各科的平均成绩
int i, j;
int sum, num = 0;
for (i = 0; i < n; i++) {
sum = 0;
stu[i] = new Student(m);
for (j = 0; j < m; j++) { //依次读入一个学生的各科成绩
stu[i].grade[j] = in.nextInt();
sum += stu[i].grade[j]; //一个学生实例的成绩总和
avg[j] += stu[i].grade[j]; //各科的总成绩
}
stu[i].setAvg(sum * 1.0 / m); //设置该学生的平均成绩
}
for (j = 0; j < m; j++) { //各科的总成绩取平均
avg[j] /= n;
}
boolean flag;
//计算各科成绩均大于等于平均成绩的学生数量
for (i = 0; i < n; i++) {
flag = true;
for (j = 0; j < m; j++) {
if (stu[i].grade[j] < avg[j]) {
flag = false;
break;
}
}
if (flag) {
num++;
}
}
for (i = 0; i < n - 1; i++) {
System.out.printf("%.2f ", stu[i].avg);
}
System.out.printf("%.2f", stu[n - 1].avg);
System.out.println();
for (i = 0; i < m - 1; i++) {
System.out.printf("%.2f ", avg[i]);
}
System.out.printf("%.2f", avg[m - 1]);
System.out.println();
System.out.println(num);
System.out.println();
}
}
public static class Student {
double avg;
double[] grade;
//Student类的构造函数
public Student(int m) {
grade = new double[m]; //实例化每个Student的成绩数组
}
public void setAvg(double avg) {
this.avg = avg;
}
}
}
package com.opp.unit2.homework2.demo4;
import java.util.Scanner;
public class MyMain {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
String chioce;
StudentBiz studentBiz = new StudentBiz();
do {
/**
* 写入数值，带入数组
*/
Student student = new Student();
System.out.println("请输入学号：");
student.id=scanner.nextInt();
System.out.println("请输入JAVA成绩：");
student.javaScores = scanner.nextDouble();
System.out.println("请输入C3成绩：");
student.CScores = scanner.nextDouble();
System.out.println("请输入DB成绩：");
student.dbScores = scanner.nextDouble();
studentBiz.addScores(student);
System.out.println("是否继续？(y/n)");
chioce = scanner.next();
} while ("y".equals(chioce));
studentBiz.showavgs();
}
}
package com.opp.unit2.homework2.demo4;
public class Student {
/**
* 定义学生属性
*/
public double javaScores;
public double CScores;
public double dbScores;
public double avg;
public int id;
/**
* 定义显示学生方法
*/
public void showInfo() {
System.out.println("学生"+id+"平均成绩为:" + (avg = (javaScores + CScores + dbScores) / 3));
}
}
package com.opp.unit2.homework2.demo4;
public class StudentBiz {
/**
* 学生管理类
*/
Student[] avgs = new Student[10];
/**
* 添加学生信息（成绩）
*
* @param avg
* @date 将学生数据作为元素存入数组（变成参数插入）
*/
public void addScores(Student avg) {
for (int i = 0; i < avgs.length; i++) {
if (avgs[i] == null) {
avgs[i] = avg;
break;
}
}
}
/**
* 展示每个学生的3科平均分
*/
public void showavgs() {
System.out.println("学生平均分为：");
for (int i = 0; i < avgs.length; i++) {
if (avgs[i] != null) {
avgs[i].showInfo();
}
}
}
}
