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java代码题 java程序例题代码

这两道题代码怎么写java?

创建一个名字为“ReportCard”的类,然后用下边的内容全部替换掉,你会成为全班最亮的仔。

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import java.util.HashMap;

/**

* 学生成绩单

*/

public class ReportCard {

public static void main(String[] args) {

ReportCard reportCard = new ReportCard("张三", "070602213");

reportCard.set("语文", 80.0);

reportCard.set("数学", 59.5);

reportCard.set("英语", 66.0);

reportCard.set("java", 80, 99.0);

reportCard.set("数据库", 80, 66.0);

reportCard.set("毛概", null);

System.out.println(reportCard.getStudentName() + "语文分数:" + reportCard.get("语文"));

System.out.println(reportCard.getStudentName() + "数学考核结果:" + (reportCard.isPassed("数学") ? "合格" : "不合格"));

System.out.println(reportCard.getStudentName() + "期末是否挂科:" + (reportCard.isAllPassed() ? "否" : "是"));

}

// 学生姓名

private String studentName;

// 学生学号

private String studentNumber;

// 成绩单

private HashMapString, CourseResult cards = new HashMap();

public ReportCard() {

}

public ReportCard(String studentName, String studentNumber) {

this.studentName = studentName;

this.studentNumber = studentNumber;

}

public Double get(String courseName){

CourseResult courseResult = cards.get(courseName);

return courseResult == null ? Double.NaN : courseResult.getStudentScore();

}

public void set(String courseName, Double studentScore){

CourseResult courseResult = new CourseResult(courseName, studentScore);

cards.put(courseName, courseResult);

}

public void set(String courseName, double passMark, Double studentScore){

CourseResult courseResult = new CourseResult(courseName, passMark, studentScore);

cards.put(courseName, courseResult);

}

public boolean isPassed(String courseName){

return cards.get(courseName).isPassed();

}

public boolean isAllPassed(){

for(CourseResult cr : cards.values()){

if ( ! cr.isPassed()) {

return false;

}

}

return true;

}

public String getStudentName() {

return studentName;

}

public String getStudentNumber() {

return studentNumber;

}

public void setStudentName(String studentName) {

this.studentName = studentName;

}

public void setStudentNumber(String studentNumber) {

this.studentNumber = studentNumber;

}

/**

* 课程

*/

class Course{

// 课程名称

protected String courseName;

// 及格分

protected double passMark = 60;

public Course(String courseName, Double passMark) {

this.courseName = courseName;

if ( passMark != null) {

this.passMark = passMark;

}

}

}

/**

* 课程成绩

*/

class CourseResult extends Course{

// 学生成绩

private Double studentScore;

public CourseResult(String courseName, Double studentScore) {

this(courseName, null, studentScore);

}

public CourseResult(String courseName, Double passMark, Double studentScore) {

super(courseName, passMark);

this.studentScore = studentScore == null ? Double.NaN : studentScore;

}

public boolean isPassed(){

return studentScore = passMark;

}

public String getCourseName() {

return courseName;

}

public double getPassMark() {

return passMark;

}

public Double getStudentScore() {

return studentScore;

}

}

java练习题求完整代码

按照题目要求编写的用javaBean规范设计的学生类Student的Java程序如下

需要创建user.java.test包,把Student.java文件和Test.java文件放入包中,编译Student.java文件并且编译运行Test.java文件得到运行结果

Student.java文件代码如下

package user.java.test;

import java.io.Serializable;

public class Student implements Serializable{

private static final long serialVersionUID = 1L;

private String no;

private String name;

private double score;

public Student(){}

public Student(String no,String name,double score){

this.no=no;

this.name=name;

this.score=score;

}

public String getNo(){ return no;}

public void setNo(String no){ this.no=no;}

public String getName(){ return name;}

public void setName(String name){ this.name=name;}

public double getScore(){ return score;}

public void setScore(double score){ this.score=score;}

public String toString(){

return "学号:"+no+",姓名:"+name+",成绩:"+score;

}

public static double getAvg(Student[] sArray){

double sum=0,avg;

for(int i=0;isArray.length;i++){

sum=sum+sArray[i].getScore();

}

avg=sum/sArray.length;

return avg;

}

}

Test.java文件代码如下

package user.java.test;

public class Test{

public static void main(String[] args){

Student[] sArray=new Student[5];

sArray[0]=new Student("001","张三",89.5);

sArray[1]=new Student("002","李四",82.5);

sArray[2]=new Student("003","王五",93);

sArray[3]=new Student("004","赵六",73.5);

sArray[4]=new Student("005","孙七",66);

System.out.println("这些学生的平均分:"+Student.getAvg(sArray));

for(int i=0;isArray.length;i++){

System.out.println(sArray[i].toString());

}

}

}

5道简单的JAVA编程题(高分悬赏)

很详细的帮你写下,呵呵,所以要给分哦!

1、

(1)源程序如下:

public class One {

public static void main(String[] args) {

String name = "张三";

int age = 23;

char sex = '男';

String myclass = "某某专业2班";

System.out.println("姓名:" + name);

System.out.println("姓名:" + age);

System.out.println("姓名:" + sex);

System.out.println("姓名:" + myclass);

}

}

(2)

编写完程序的后缀名是.java,如本题,文件名就是One.java。

开始\运行\cmd,进入“命令提示符窗口”,然后用javac编译器编译.java文件,语句:javac One.java。

(3)

编译成功后,生成的文件名后缀是.class,叫做字节码文件。再用java解释器来运行改程序,语句:java One

2、编写程序,输出1到100间的所有偶数

(1)for语句

public class Two1 {

public static void main(String[] args) {

for(int i=2;i=100;i+=2)

System.out.println(i);

}

}

(2)while语句

public class Two2 {

public static void main(String[] args) {

int i = 2;

while (i = 100) {

System.out.println(i);

i += 2;

}

}

}

(3)do…while语句

public class Two3 {

public static void main(String[] args) {

int i = 2;

do {

System.out.println(i);

i += 2;

}while(i=100);

}

}

3、编写程序,从10个数当中找出最大值。

(1)for循环

import java.util.*;

public class Three1 {

public static void main(String[] args) {

Scanner input = new Scanner(System.in);

int number;

int max = 0;

for (int i = 0; i 10; i++) {

System.out.print("输入第" + (i + 1) + "个数:");

number = input.nextInt();

if (max number)

max = number;

}

System.out.println("最大值:" + max);

}

}

(2)while语句

import java.util.*;

public class Three2 {

public static void main(String[] args) {

Scanner input = new Scanner(System.in);

int number;

int max = 0;

int i = 0;

while (i 10) {

System.out.print("输入第" + (i + 1) + "个数:");

number = input.nextInt();

if (max number)

max = number;

i++;

}

System.out.println("最大值:" + max);

}

}

(3)do…while语句

import java.util.*;

public class Three3 {

public static void main(String[] args) {

Scanner input = new Scanner(System.in);

int number;

int max = 0;

int i = 0;

do {

System.out.print("输入第" + (i + 1) + "个数:");

number = input.nextInt();

if (max number)

max = number;

i++;

}while(i10);

System.out.println("最大值:" + max);

}

}

4、编写程序,计算从1到100之间的奇数之和。

(1)for循环

public class Four1 {

public static void main(String[] args) {

int sum=0;

for(int i = 1;i=100;i+=2){

sum+=i;

}

System.out.println("1~100间奇数和:" + sum);

}

}

(2)while语句

public class Four2 {

public static void main(String[] args) {

int sum = 0;

int i = 1;

while (i = 100) {

sum += i;

i += 2;

}

System.out.println("1~100间奇数和:" + sum);

}

}

(3)do…while语句

public class Four3 {

public static void main(String[] args) {

int sum = 0;

int i = 1;

do {

sum += i;

i += 2;

} while (i = 100);

System.out.println("1~100间奇数和:" + sum);

}

}

5、

(1)什么是类的继承?什么是父类?什么是子类?举例说明。

继承:是面向对象软件技术当中的一个概念。如果一个类A继承自另一个类B,就把这个A称为"B的子类",而把B称为"A的父类"。继承可以使得子类具有父类的各种属性和方法,而不需要再次编写相同的代码。在令子类继承父类的同时,可以重新定义某些属性,并重写某些方法,即覆盖父类的原有属性和方法,使其获得与父类不同的功能。另外,为子类追加新的属性和方法也是常见的做法。继承需要关键字extends。举例:

class A{}

class B extends A{}

//成员我就不写了,本例中,A是父类,B是子类。

(2)编写一个继承的程序。

class Person {

public String name;

public int age;

public char sex;

public Person(String n, int a, char s) {

name = n;

age = a;

sex = s;

}

public void output1() {

System.out.println("姓名:" + name + "\n年龄:" + age + "\n性别:" + sex);

}

}

class StudentPerson extends Person {

String school, department, subject, myclass;

public StudentPerson(String sc, String d, String su, String m, String n,

int a, char s) {

super(n, a, s);

school = sc;

department = d;

subject = su;

myclass = m;

}

public void output2() {

super.output1();

System.out.println("学校:" + school + "\n系别:" + department + "\n专业:"

+ subject + "\n班级:" + myclass);

}

}

public class Five2 {

public static void main(String[] args) {

StudentPerson StudentPersonDemo = new StudentPerson("某某大学", "某某系别",

" 某专业", "某某班级", " 张三", 23, '男');

StudentPersonDemo.output2();

}

}

Java类的一道题?

下面是实现这道题的 Java 代码:

public class Car {

// 品牌

private String brand;

// 颜色

private String color;

// 车龄

private int age;

// 构造方法

public Car() {}

// set 方法

public void setBrand(String brand) {

this.brand = brand;

}

public void setColor(String color) {

this.color = color;

}

public void setAge(int age) {

this.age = age;

}

// get 方法

public String getBrand() {

return brand;

}

public String getColor() {

return color;

}

public int getAge() {

return age;

}

}

public class CarDemo {

public static void main(String[] args) {

// 实例化 Car 对象

Car car = new Car();

// 调用 set 方法设置参数值

car.setBrand("宝马");

car.setColor("红色");

car.setAge(5);

// 调用 get 方法输出参数值

System.out.println("品牌:" + car.getBrand());

System.out.println("颜色:" + car.getColor());

System.out.println("车龄:" + car.getAge());

}

}

在 Car 类中,我们定义了三个私有属性:品牌、颜色和车龄。然后,我们定义了一个不带参数的构造方法,用于创建 Car 对象。接着,我们定义了三个 set 方法,分别用于设置品牌、颜色和车龄的值。最后,我们定义了三个 get 方法,分别用于返回品牌、颜色和车龄的值。

在 CarDemo 类中,我们实例化了一个 Car 对象,然后调用 set 方法设置参数值,


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