求3(可调整)个学员成绩的和或平均分或两者都具package day5;
import java.util.Scanner;
public class Score {
//构造函数
public Score(){
System.out.println("实例化对象调用了我");
}
int sum;
double avg;
// 定义求和的方法
public int sum() {
Scanner scanner = new Scanner(System.in);
for (int i = 0; i < 3; i++) {
System.out.println("请输入第" + (i + 1) + "个学员成绩");
int score = scanner.nextInt();
sum += score;
}
return sum;
}
//求平均分的方法 凡是方法名报错都是没有返回值return;
public double avg(){
double result = sum()/3;
return result;
}
//既求和又求平均分的方法
public double[] getSumAndAvg(){
double[] results = new double[2];
Scanner scanner = new Scanner(System.in);
for (int i = 0; i < 3; i++) {
System.out.println("请输入第" + (i + 1) + "个学员成绩");
int score = scanner.nextInt();
sum += score;
}
results[0] = sum;
results[1] = sum/3;
return results;
}
}
package day5;
import java.util.Arrays;
public class ScoreCalc {
public static void main(String[] args) {
// 由类来产生对象 (实例化)会调用你的构造函数
Score score1 = new Score();
// 对象生成以后, 可以调用对象里的各个属性和方法
System.out.println(score1.sum());
System.out.println(Arrays.toString(score1.getSumAndAvg()));
}
}
结果图:
求三门课的和及平均分(构造有参函数)package day5_1;
public class Score {
// 属性
int math;// 数学成绩
int chinese;// 语文成绩
int english;// 英语成绩
int sum;// 总分
double avg;// 平均分
// 构造函数 与类同名,没有返回值 作用:数据的初始化!!!
public Score(int math, int chinese, int english) {
this.math = math;
this.chinese = chinese;
this.english = english;
}
// 方法
// 求和
public int sum() {
sum = math + chinese + english;
return sum;
}
// 求平均分
public double avg() {
avg = (math + chinese + english) / 3.0;
return avg;
}
}
package day5_1;
import java.util.Scanner;
public class ScoreTest {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.println("请输入数学成绩");
int math = scanner.nextInt();
System.out.println("请输入语文成绩");
int chinese = scanner.nextInt();
System.out.println("请输入英语成绩");
int english = scanner.nextInt();
//单纯的实例化对象
// Score score = new Score();
// score.math = math;
// score.chinese = chinese;
// score.english = english;
//实例化兑现过的同时进行数据的初始化
Score score = new Score(math,chinese,english);
int result1 = score.sum();
double result2 = score.avg();
System.out.println(result1);
System.out.println(result2);
}
}
结果图:
学生名字排序(创建一个数组对象)package day5_2;
import java.util.Arrays;
public class NameSort {
//2:把方法封装
public String[] sort(String[] unOrderArr) {
Arrays.sort(unOrderArr);
return unOrderArr;
}
}
package day5_2;
import java.util.Arrays;
import java.util.Scanner;
public class NameSortTest {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
//1:准备数据
String names[]= new String[5];
for (int i = 0; i < 5; i++) {
System.out.println("请一次输入第" + (i + 1) + "个学生名字");
names[i] = scanner.next();
}
//3:调用类的方法(先实例化出对象)
NameSort sortName = new NameSort();
String[] orderArr = sortName.sort(names);
System.out.println(Arrays.toString(orderArr));
}
}
结果图:
单个对象的三门成绩求均分(传输对象)package day5_2;
public class Student {
int math;
int chinese;
int english;
public Student(int math,int chinese,int english){
this.math = math;
this.chinese = chinese;
this.english = english;
}
}
package day5_2;
public class StudentCalc {
//创建一个对象(Student)
public double avg(Student student){
int mathScore = student.math;
int chineseScore = student.chinese;
int englishScore = student.english;
double avg = (mathScore+chineseScore+englishScore)/3;
return avg;
}
}
package day5_2;
import java.util.Scanner;
public class StudentTest {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.println("请输入数学成绩");
int math = scanner.nextInt();
System.out.println("请输入语文成绩");
int chinese = scanner.nextInt();
System.out.println("请输入英语成绩");
int english = scanner.nextInt();
Student zhangSan = new Student(math, chinese, english);
StudentCalc calc = new StudentCalc();
System.out.println("平均分:"+calc.avg(zhangSan));
}
}
结果图:
多个对象的姓名,年龄,身高,总身高平均(传输对象数组)package day5_3;
(构造一个有参函数)
public class Student {
String name;
int age;
int height;
public Student(String name,int age,int height){
this.name = name;
this.age = age;
this.height = height;
}
}
package day5_3;
public class StudentManager {
//创建一个对象数组(Student[])
public int avg(Student[] students) {
int sum = 0;
for (int i = 0; i < students.length; i++) {
sum += students[i].height;
}
return sum/students.length;
}
}
package day5_3;
import java.util.Scanner;
public class StudentManagerTest {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
Student[] students = new Student[2];
for (int i = 0; i < students.length; i++) {
System.out.println("输入姓名");
String name = scanner.next();
System.out.println("请输入年龄");
int age = scanner.nextInt();
System.out.println("请输入身高");
int height = scanner.nextInt();
Student student = new Student(name, age, height);
students[i] = student;
}
StudentManager calc = new StudentManager();
System.out.println(calc.avg(students));
}
}
结果图:
一次传递多个参数 package Day5_4;
public class User {
String nick;
String pwd;
int age;
String sex;
String resignDate;
String degree;
public User(String nick,String pwd,int age,String sex,String resignDate,String degree){
this.nick =nick;
this.pwd = pwd;
this.age = age;
this.resignDate = resignDate;
this.sex = sex;
this.degree = degree;
}
public void showMessage() {
System.err.println("大家好!我是"+nick+",今年"+age+"岁");
System.err.println("我是"+resignDate+"年注册的,目前等级是:"+degree);
}
}
package Day5_4;
import java.util.Scanner;
public class UserTest {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.println("请输入您的昵称:");
String nick = scanner.next();
System.out.println("请输入您的密码:");
String pwd = scanner.next();
System.out.println("请输入您的性别:");
String sex = scanner.next();
System.out.println("请输入您的等级:");
String degree = scanner.next();
System.out.println("请输入您的年龄:");
int age = scanner.nextInt();
System.out.println("请输入您的注册时间:");
String resignDate = scanner.next();
User user = new User(nick, pwd, age, sex, resignDate, degree);
user.showMessage();
}
}
结果图:
时间： 2024-10-13 22:33:37