有趣java编程题

‘壹’ java编程题 有趣的数

就你出的题来说，没看懂，就java来说表示起始2，一直到N做循环
import java.util.Scanner;

public class FunNumber {

public static void main(String[] args) {
Scanner fin = new Scanner(System.in);
int N = fin.nextInt();

long i = (long)Math.pow(10, N-1);
long j = (long)Math.pow(10, N);
long count = 0;
for(;i<j;i++){
if(isFun(i,N)) {
count++;
System.out.println(i);
}
}
System.out.println("Count % 1000000007 = " + count%1000000007);

}
public static boolean isFun(long num,int N){
boolean[] num_exist = new boolean[4];

for(;N>0;N--){
int i = (int)(num%Math.pow(10,N)/Math.pow(10,N-1));
switch(i){
case 0:
num_exist[0] = true;
//0必须都在1前
if(num_exist[1]){
return false;
}
break;
case 1:
num_exist[1] = true;
break;
case 2:
num_exist[2] = true;
//2必须都在3前
if(num_exist[3]){
return false;
}
break;
case 3:
num_exist[3] = true;
break;
default:
//不只包含0123
return false;
}

}
//0123至少出现1次
if(num_exist[0]&&num_exist[1]&&num_exist[2]&&num_exist[3]){
return true;
}
return false;

}

}

‘贰’ 一道简单的java编程题

import java.text.ParseException;

import java.text.SimpleDateFormat;
//日期类
public class Date {
private String year;
private String month;
private String day;

public Date(String year, String month, String day) {
this.year = year;
this.month = month;
this.day = day;
}
public void format(){
System.out.println(day + "/" + month + "/" + year);
}

public void calculate(){
SimpleDateFormat sdf = new SimpleDateFormat("yyyy/MM/dd");
try {
java.util.Date startDate = sdf.parse(year + "/" + "01" + "/" + "01");
java.util.Date inputDate = sdf.parse(year + "/" + month + "/" + day);
long resultDay = (inputDate.getTime() - startDate.getTime())/(24 * 1000 * 60 * 60);
System.out.println("第" + (resultDay + 1) + "天");
} catch (ParseException e) {
e.printStackTrace();
}
}
}
//测试类
public class Test {
public static void main(String[] args) {
Date date1 = new Date("2020","04","11");
Date date2 = new Date("2020","01","02");
date1.format();
date1.calculate();
date2.format();
date2.calculate();
}
}

‘叁’ 一道JAVA编程题

class
WangTi2
{
public
static
void
main(String[]
args)
{
long
start
=
System.currentTimeMillis();//看一下要运行多长时间
shuanShu();
long
end
=
System.currentTimeMillis();//看一下要运行多长时间
System.out.println("用时"+(end-start));
}
public
static
void
shuanShu()
{
int[]
arr
=
new
int[100];
arr[0]
=
1;
for(int
x=0;x<11213;x++)
//可以把11213改成100验证方法的正确性
{
//2^20=1048576
int
z
=
0;
/*
这个循环是记录乘2的结果
*/
for(int
y
=0;y<arr.length;y++)
{
arr[y]
=
arr[y]<<1;
arr[y]
=
arr[y]
+
z;
if
(arr[y]>9)
{
arr[y]
-=
10;
if(y!=arr.length-1)
z
=
1;
}
else
z
=
0;
}
}
arr[0]--;
//这个给最后一个位减1，这个值不会是负数。
System.out.println("这个数的最后100位是：");
for(int
x=arr.length-1;x>=0;x--)
{
System.out.print(arr[x]);
if(x%3==0&&x!=0)
System.out.print(",");
}
System.out.println();
}
}
思路是有的。定义数组，只存储最后100位。然后不停的乘2，大于9的向上一个数组加1。重复11213次。再把第一个数组减1。这样做是可以的。效率很低。求高人解答。。呵呵。

‘肆’ 一道有趣的Java编程题，如何输出Hello world!

……v_v……

System.out.append("hello")
==
null
append代表在printStream加上输出。
这回该我的答案该通过了吧？再不通过我就贴到空间上去。

‘伍’ 一道有趣的Java编程题，如何输出Hello world!

可以这样：

publicclassDemo{
publicstaticvoidmain(String...a){
if(newObject(){{System.out.print("Hello,");}}==null){
System.out.print("Hello,");
}else{
System.out.println("World");
}
}
}

输入结果：

‘陆’ 有关java编程题目

按照题目要求编写的圆,圆锥和测试类的Java程序如下

Test.java文件内容如下

class Circle{

private double r;

private String color;

public Circle(double r){

this.r=r;

}

public double area(){

return Math.PI*r*r;

}

public double perimeter(){

return Math.PI*2*r;

}

public double getR(){

return this.r;

}

public void setR(double r){

this.r=r;

}

public String getColor(){

return this.color;

}

public void setColor(String color){

this.color=color;

}

public String toString(){

return "圆的半径为"+r+",颜色为"+color;

}

}

class Cone{

private Circle c;

private double h;

private String color;

public Cone(Circle c,double h){

this.c=c;

this.h=h;

}

public double volume(){

return 1.0/3*c.area()*h;

}

public Circle getCircle(){

return this.c;

}

public void setCircle(Circle c){

this.c=c;

}

public double getH(){

return this.h;

}

public void setH(double h){

this.h=h;

}

public String getColor(){

return this.color;

}

public void setColor(String color){

this.color=color;

}

public String toString(){

return "圆锥的底面积为"+c.area()+",高为"+h+",颜色为"+color;

}

}

public class Test{

public static void main(String[] args){

Circle circle1=new Circle(2.5);

circle1.setColor("红色");

System.out.println(circle1.toString());

System.out.println("圆的面积为"+circle1.area());

System.out.println("圆的周长为"+circle1.perimeter());

Cone circlar1=new Cone(circle1,2.7);

circlar1.setColor("蓝色");

System.out.println(circlar1.toString());

System.out.println("圆锥的体积为"+circlar1.volume());

}

}

‘柒’ JAVA 4道编程题 高分！

//1、2：
public class Student{
//1：创建Student类
char id;//学号
String classes;//班级
String name;//姓名
char gender;//性别
int age;//年龄
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public char getId() {
return id;
}
public String getClasses() {
return classes;
}
public String getName() {
return name;
}
public char getGender() {
return gender;
}
//2.创建Application并实例化Student
public static void main(String[] args){
new Student();
}
}

//3：

public class Student2 {
int age;
String name;
public int getAge() {
return age;
}
public String getName() {
return name;
}
}

class Undergraate extends Student2{
String specialty;

public String getSpecialty() {
return specialty;
}
}

class Postgraate extends Student2{
String studydirection;

public String getStudydirection() {
return studydirection;
}
}

//4：

public class Book {
String name;
String author;
double monthlySale;

public Book(String name, String author, double monthlySale) {
this.name = name;
this.author = author;
this.monthlySale = monthlySale;
}
public Book(){
name="name";
author="author";
monthlySale=0;
}
//这两个成员方法LZ没有说清楚，我猜可能是个意思。
public void setBook(String name, String author, double monthlySale) {
this.name = name;
this.author = author;
this.monthlySale = monthlySale;
}
public void getBook(){
System.out.println("name:"+name);
System.out.println("author:"+author);
System.out.println("monthly sale:"+monthlySale);

}
}
这种题目以后尽量自己做，又不难。

‘捌’ JAVA编程题，知道写的来看看（有点难度）

class ComplexNumber{
private double m_dRealpart;
private double m_dImaginpart;
ComplexNumber(double r,double i){
m_dRealpart=r;
m_dImaginpart=i;
}
void setRealPart(double d){
m_dRealpart=d;
}
void SetImaginpart(double d){
m_dImaginpart=d;
}
ComplexNumber complexAdd(ComplexNumber c){
return new ComplexNumber(m_dRealpart+c.m_dRealpart,m_dImaginpart+c.m_dImaginpart);
}
ComplexNumber complexMinus(ComplexNumber c){
return new ComplexNumber(m_dRealpart-c.m_dRealpart,m_dImaginpart-c.m_dImaginpart);
}
ComplexNumber complexMulti(ComplexNumber c){
return new ComplexNumber(m_dRealpart*c.m_dRealpart-m_dImaginpart*c.m_dImaginpart,m_dImaginpart*c.m_dRealpart+m_dRealpart*c.m_dImaginpart);}
public String toString(){
return m_dRealpart+"+"+m_dImaginpart+"i";
}
}
第二个就不会了;
忘了个括号,抱歉.
1
class Year{
public static void cal(int year){
if(((year%4==0) & (year%100!=0)) | (year%400==0))
System.out.println("是闰年");
else
System.out.println("不是闰年");
}
}
class TestYear{
public static void main(String[] args){
Year.cal(1932);
}
}

2
class TestString{
public static void main(String[] args){
String[] n;
String s="I am good person";
System.out.println("该字符串中字符的个数:"+s.length());
n=s.split(" ",4);
System.out.println("该字符串中单词的个数:"+n.length);
}
}

‘玖’ 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(i<10);
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();
}
}