Java程序设计

成绩我定义成double了，另外平均分我给你保留两位小数：

public class Student {

private String No; //学号

private String name; //姓名

private String gender; //性别

private int age; //年龄

private double chinese; //语文

private double math; //数学

private double english; //英语

//构造函数

public Student(String no,

String name,

String gender,

int age,

double chinese,

double math,

double english) {

No = no;

thisname = name;

thisgender = gender;

thisage = age;

thischinese = chinese;

thismath = math;

thisenglish = english;

}

@Override

public String toString() {

return "Student{" +

"No='" + No + '\'' +

", name='" + name + '\'' +

", gender='" + gender + '\'' +

", age='" + age + '\'' +

", chinese=" + chinese +

", math=" + math +

", english=" + english +

'}';

}

//计算总分

public double getSum() {

return thischinese + thismath + thisenglish;

}

//计算平均分

public double getAverage() {

return (thischinese + thismath + thisenglish) / 3;

}

}

测试类：

class Test {

public static void main(String[] args) {

Student student = new Student(

"20190001",

"张三",

"男",

18,

1095,

890,

1100);

double sum = studentgetSum();

double average = studentgetAverage();

Systemoutprintln("该学生的信息为：" + studenttoString());

Systemoutprintln("该学生的总分为：" + sum);

Systemoutprintln("该学生的平均分为：" + Stringformat("%2f", average));

}

}

运行结果：

这代码会挤在一起，我给你截个图看看：

Student类：

3-28行

28-51行

Test类：

public class Student { //定义一个学生类

private int StuNum; //学号

private int Class; //班级

private char Gender; //性别

private int Age; //年龄

public Student(int StuNum, int Class, char Gender, int Age){//构造函数

thisstuNum = StuNum;

thisclass = Class;

thisgender = Gender;

thisage = Age;

}

public int getStuNum() { //获得学号

return StuNum;

}

public int getClass() { //获得班级号

return Class;

}

public char getGender() { //获得性别

return Gender;

}

public void setGender(char Gender) { //修改性别

thisGender = Gender;

}

public int getAge() { //获得年龄

return Age;

}

public void setAge(int Age) { //修改年龄

thisAge = Age;

}

public class Pupil extends Student //小学生

{

//(由于没说派生后要新加什么东西，所以这里写了省略号，如果想在

// 新派生出来的类里加点什么特殊的东西，直接在省略号位置加就行了

// 下同）

}

public class MidSchoolStu extends Student //中学生

{

//

}

public class UnderGraduate extends Student //大学生

{

//

}

public class PostGraduate extends Student //研究生

{

//

}

public class FreshStudent extends UnderGraduate //一年级学生

{

//

}

public class Sophomore extends UnderGraduate //二年级学生

{

//

}

public class Junior extends UnderGraduate //三年级学生

{

//

}

public class Senior extends UnderGraduate //四年级学生

{

//

}

public class Master extends PostGraduate //硕士生

{

//

}

public class Doctor extends PostGraduate //博士生

{

//

}

给你写完了 很容易的：

/ Catalanjava

Contains 2 methods factorial and cata

catalan calculates the n-th catalan number

factorial calculates the factorial recursively

Receive: n

Return: n-th catalan number

/

public class Catalan {

private long factorial(int n) {

if (n == 0) {

return 1;

} else {

return n factorial(n - 1);

}

}

public long calCatalan(int n) {

return factorial(2 n) / (factorial(n + 1) factorial(n));

}

}

import javautilScanner;

import javautilregexPattern;

/

Calculates the value of a specific Catalan number

Input: integer value

Output: n-th Catalan number

/

public class CatalanDemo {

public static void main(String[] args) {

Scanner in = new Scanner(Systemin);

Catalan catalan = new Catalan();

while (true) {

Systemoutprintln("Which catalan number do you want to calculate (-1 to stop): ");

String s = innextLine();

if (Patternmatches("[0-9]", s)) {

int n = IntegerparseInt(s);

Systemoutprint("n=" + n);

Systemoutprintln(": catalan number is " + catalancalCatalan(n));

} else {

if (Patternmatches("-[0-9]", s)) {

int n = IntegerparseInt(s);

if (n == -1) {

Systemoutprintln("(program exits)");

break;

} else {

Systemoutprintln("Invalid input:\nValid input range is an input >= 0");

}

}

}

}

}

}

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