2019年8月8日开始编写，等50题做完了希望不会太晚。
本篇纯属本人的练手作业，本人也不是什么大神，仅供参考。
题目1
package SU;
/**
* @ClassName WayRabbit
* @Description 有一对兔子，从出生后第3个月起每个月都生一对兔子，小兔子长到第三个月后每个月又生一对兔子，假如兔子都不死，问每个月的兔子总数为多少？
* @Author TumTam
* @Date 2019/8/8 14:12
* @Version 1.0
**/
public class WayRabbit {
public int WayRabbit(int m){
if(m==1|m==2){
return 1;
}else{
return WayRabbit(m-1)+WayRabbit(m-2);
}
}
}
package SU;
import java.util.Scanner;
public class WayRabbitTest {
public static void main(String[] args) {
System.out.println("你想知道第几个月的兔子数？");
Scanner months =new Scanner(System.in);
int m = months.nextInt();
months.close();
WayRabbit wr =new WayRabbit();
int num = wr.WayRabbit(m);
System.out.println("第"+m+"个月的兔子有："+num+"对");
}
}
题目2
package SU;
/**
* @ClassName IsPrime
* @Description 判断101-200之间有多少个素数，并输出所有素数。
* @Author TumTam
* @Date 2019/8/8 14:58
* @Version 1.0
**/
public class IsPrime {
//修改为指定范围内的素数
public IsPrime(int min,int max){
int count =0;
int n=min;
int m=max;
for(;n
Boolean b =true;
for(int i=2;i if(n%i==0){ b =false; break; } } if(b==true){ count++; System.out.print(n+" "); } } System.out.println(); System.out.println("在"+min+"和"+max+"范围内共有"+count+"个素数。"); } } package SU; import java.util.Scanner; public class IsPrimeTest { public static void main(String[] args) { System.out.println("输入最大值、最小值确认范围来输出其中的素数："); Scanner num =new Scanner(System.in); int a=num.nextInt(); int b=num.nextInt(); num.close(); int max; int min; if(a>b){ max = a; min = b; }else{ max = b; min = a; } IsPrime ip =new IsPrime(min,max); } } package SU; /** * @ClassName NarcissisticNumber * @Description 打印出所有的"水仙花数"，所谓"水仙花数"是指一个三位数，其各位数字立方和等于该数本身。 * @Author TumTam * @Date 2019/8/8 15:32 * @Version 1.0 **/ public class NarcissisticNumber { //修改为指定范围的水仙花数 public NarcissisticNumber(int min,int max){ int n = min; int m = max; int count =0; for(;n int hundred = n /100; int decade = n /10%10; int unit = n %10; int total = hundred * hundred * hundred + decade * decade * decade + unit * unit * unit; if(n==total){ count++; System.out.print(n+" "); } } System.out.println("在"+min+"和"+max+"范围内共有"+count+"个水仙花数"); } } package SU; import java.util.Scanner; public class NarcissisticNumberTest { public static void main(String[] args) { System.out.println("输入最大值、最小值确认范围来输出其中的水仙花数(三位数)："); Scanner num =new Scanner(System.in); int a=num.nextInt(); int b=num.nextInt(); num.close(); int max; int min; if(a>b){ max = a; min = b; }else{ max = b; min = a; } NarcissisticNumber nn =new NarcissisticNumber(min,max); } } package SU; /** * @ClassName Factorization * @Description 将一个正整数分解质因数。例如：输入90,打印出90=2*3*3*5 * @Author TumTam * @Date 2019/8/8 15:55 * @Version 1.0 **/ public class Factorization { public Factorization(int num){ System.out.print(num+"="); int current = num; for(int i=2;i if(current%i==0){ System.out.print(i+"*"); current=current/i; i=1; } } System.out.print(current); } } package SU; import java.util.Scanner; public class FactorizationTest { public static void main(String[] args) { System.out.println("你想因式分解哪个因数？"); Scanner num =new Scanner(System.in); int n = num.nextInt(); num.close(); Factorization f =new Factorization(n); } } package SU; /** * @ClassName ConditionalOperator * @Description 利用条件运算符的嵌套来完成此题：学习成绩>=90分的同学用A表示，60-89分之间的用B表示，60分以下的用C表示。 * @Author TumTam * @Date 2019/8/8 16:12 * @Version 1.0 **/ public class ConditionalOperator { public ConditionalOperator(int score){ String Grade = (score>=90) ?"A" :((score>=60)?"B" :"C"); System.out.println("当前分数所属等级为："+Grade); } } package SU; import java.util.Scanner; public class ConditionalOperatorTest { public static void main(String[] args) { System.out.println("输入你的分数："); Scanner score =new Scanner(System.in); int s = score.nextInt(); score.close(); ConditionalOperator co =new ConditionalOperator(s); } } package SU; /** * @ClassName GreatestCommonDivisorAndLeastCommonMultiple * @Description 输入两个正整数m和n，求其最大公约数和最小公倍数。 * @Author TumTam * @Date 2019/8/8 16:24 * @Version 1.0 **/ public class GreatestCommonDivisorAndLeastCommonMultiple { public GreatestCommonDivisorAndLeastCommonMultiple(int a,int b){ int GreatestCommonDivisor=1; int LeastCommonMultiple; int max = Max(a,b); for(int i=1;i if(a%i==0 && b%i==0){ GreatestCommonDivisor=Max(GreatestCommonDivisor,i); } } LeastCommonMultiple = (a*b)/GreatestCommonDivisor; System.out.println(a+"和"+b+"的最大公约数为："+GreatestCommonDivisor); System.out.println(a+"和"+b+"的最小公倍数为："+LeastCommonMultiple); } public int Max(int x,int y){ if(x>y){ return x; }else{ return y; } } } package SU; import java.util.Scanner; public class GreatestCommonDivisorAndLeastCommonMultipleTest { public static void main(String[] args) { System.out.println("输入两个数求他们的最大公因数和最小公倍数。"); Scanner Num =new Scanner(System.in); int m = Num.nextInt(); int n = Num.nextInt(); Num.close(); GreatestCommonDivisorAndLeastCommonMultiple gcdANDlcm =new GreatestCommonDivisorAndLeastCommonMultiple(m,n); } } package SU; /** * @ClassName Statistics * @Description 输入一行字符，分别统计出其英文字母、空格、数字和其它字符的个数。 * @Author TumTam * @Date 2019/8/9 8:25 * @Version 1.0 **/ public class Statistics { int chara =0,blank=0,number=0,others=0; public Statistics(String s){ for(int i=0;i char c = s.charAt(i); if(c>='a'&&c<='z'){ chara++; }else if(c>'A'&&c<'Z'){ chara++; }else if(c==' '){ blank++; }else if(c>='0'&&c<='9'){ number++; }else{ others++; } } System.out.println("当前字符串里共有："); System.out.println("英文字母有"+chara+"个。"); System.out.println("空格有"+blank+"个。"); System.out.println("数字有"+number+"个。"); System.out.println("其他字符有"+others+"个。"); } } package SU; import java.util.Scanner; public class StatisticsTest { public static void main(String[] args) { System.out.println("请输入一串字符："); Scanner sentence =new Scanner(System.in); String s = sentence.nextLine(); sentence.close(); Statistics st =new Statistics(s); } } package SU; /** * @ClassName Sum * @Description 求s=a+aa+aaa+aaaa+aa...a的值，其中a是一个数字。例如2+22+222+2222+22222(此时共有5个数相加)，几个数相加有键盘控制。输出结果的形式如：2+22+222=246； * @Author TumTam * @Date 2019/8/9 10:36 * @Version 1.0 **/ public class Sum { //更改为输入的数字可以是任意数，可以输入重复次数，例如： //请输入要使用的一个数： //12 //请输入要使用的次数： //3 //12+1212+121212=122436 public Sum(int num,int times){ int sum=0; StringBuffer sb =new StringBuffer(); for(int i=0;i sb.append(num); String s = sb.toString(); int a=Integer.parseInt(s); sum+=a; System.out.print(a); if(i<(times-1)){ System.out.print("+"); }else{ System.out.print("="); System.out.print(sum); } } } } package SU; import java.util.Scanner; public class SumTest { public static void main(String[] args) { Scanner ctr =new Scanner(System.in); System.out.println("请输入要使用的一个数："); int num = ctr.nextInt(); System.out.println("请输入要使用的次数："); int times = ctr.nextInt(); ctr.close(); Sum sum =new Sum(num,times); } } 题目9 package SU; /** * @ClassName PerfectNumber * @Description 一个数如果恰好等于它的因子之和，这个数就称为"完数"。例如6=1＋2＋3.编程找出1000以内的所有完数。 * @Author TumTam * @Date 2019/8/9 11:10 * @Version 1.0 **/ public class PerfectNumber { public PerfectNumber(int min, int max){ int n=min; int m=max; for(;n int current = n; int sum=1; int i=2; for(;i<=current;i++){ if(current%i==0){ sum+=i; current=current/i; i=1; } } if(n==sum){ System.out.print(n+" "); } } } } package SU; import java.util.Scanner; public class PerfectNumberTest { public static void main(String[] args) { System.out.println("输入最大值、最小值确认范围来输出其中的完数："); Scanner num =new Scanner(System.in); int a=num.nextInt(); int b=num.nextInt(); num.close(); int max; int min; if(a>b){ max = a; min = b; }else{ max = b; min = a; } PerfectNumber pn =new PerfectNumber(min,max); } } package SU; /** * @ClassName BallWay * @Description 一球从h米高度自由落下，每次落地后反跳回原高度的一半； * 再落下，求它在 第n次落地时，共经过多少米？第n次反弹多高？ * @Author TumTam * @Date 2019/8/9 12:51 * @Version 1.0 **/ public class BallWay { double height=0; double way=0; public double Height(double h,int n) { if (n ==1) { return h/2; }else if(n==0){ return 0; }else{ height=h/2; h=height; n--; return Height(h,n); } } public double Way(double h,int n){ int num = n-1; way=way+h; //i从1开始，去除第一次落地的情况，第一次落地不用乘2，放在了上行。 for(int i=1;i way+=Height(h,num)*2; num--; } return way; } } package SU; import java.util.Scanner; public class BallWayTest { public static void main(String[] args) { Scanner base =new Scanner(System.in); System.out.println("请输入初始高度："); double h = base.nextDouble(); System.out.println("请输入次数："); int n = base.nextInt(); base.close(); BallWay bw =new BallWay(); double height = bw.Height(h,n); double way = bw.Way(h,n); System.out.println("第"+n+"次弹起的高度为"+height); System.out.println("第"+n+"次落地经过的路程为"+way); } } package SU; /** * @ClassName FormFigure * @Description 有1、2、3、4个数字，能组成多少个互不相同且无重复数字的三位数？都是多少？ * @Author TumTam * @Date 2019/8/9 14:50 * @Version 1.0 **/ public class FormFigure { public FormFigure(){ int sum =0; for(int i=1;i<=4;i++){ for(int j=1;j<=4;j++){ for(int k=1;k<=4;k++){ if(i!=j && j!=k && k!=i){ int a=i*100+j*10+k; System.out.print(a+" "); sum++; if(sum%6==0){ System.out.println(); } } } } } System.out.println("共有"+sum+"个符合条件的三位数。" ); } } package SU; public class FormFigureTest { public static void main(String[] args) { FormFigure ff =new FormFigure(); } } package SU; import java.math.BigDecimal; /** * @ClassName Bonus * @Description 企业发放的奖金根据利润提成。 * 利润(I)低于或等于10万元时，奖金可提10%； * 利润高于10万元，低于20万元时，低于10万元的部分按10%提成，高于10万元的部分，可可提成7.5%； * 20万到40万之间时，高于20万元的部分，可提成5%； * 40万到60万之间时高于40万元的部分，可提成3%； * 60万到100万之间时，高于60万元的部分，可提成1.5%，高于100万元时，超过100万元的部分按1%提成， * 从键盘输入当月利润I，求应发放奖金总数？ * @Author TumTam * @Date 2019/8/9 15:08 * @Version 1.0 **/ public class Bonus { int key1 =1000000; int key2 =600000; int key3 =400000; int key4 =200000; int key5 =100000; BigDecimalpercent =new BigDecimal(Integer.toString(0)); BigDecimaldeal =new BigDecimal(Integer.toString(0)); BigDecimaltemp =new BigDecimal(Integer.toString(0)); BigDecimalbonus =new BigDecimal(Integer.toString(0)); public BigDecimalBonus(double I){ int d =(int) I/key5; switch (d){ default: case 10: { percent =new BigDecimal(Double.toString(0.01)); deal =new BigDecimal(Double.toString(I -key1)); temp =percent.multiply(deal); bonus =bonus.add(temp); } case 9: case 8: case 7: case 6: { percent =new BigDecimal(Double.toString(0.015)); if (I >key1) { deal =new BigDecimal(Integer.toString(key1 -key2)); }else { deal =new BigDecimal(Double.toString(I -key2)); } temp =percent.multiply(deal); bonus =bonus.add(temp); } case 5: case 4: { percent =new BigDecimal(Double.toString(0.03)); if (I >key2) { deal =new BigDecimal(Integer.toString(key2 -key3)); }else { deal =new BigDecimal(Double.toString(I -key3)); } temp =percent.multiply(deal); bonus =bonus.add(temp); } case 3: case 2: { percent =new BigDecimal(Double.toString(0.05)); if (I >key3) { deal =new BigDecimal(Integer.toString(key3 -key4)); }else { deal =new BigDecimal(Double.toString(I -key4)); } temp =percent.multiply(deal); bonus =bonus.add(temp); } case 1: { percent =new BigDecimal(Double.toString(0.075)); if (I >key4) { deal =new BigDecimal(Integer.toString(key4 -key5)); }else { deal =new BigDecimal(Double.toString(I -key5)); } temp =percent.multiply(deal); bonus =bonus.add(temp); } case 0: { percent =new BigDecimal(Double.toString(0.1)); if (I >key5) { deal =new BigDecimal(Integer.toString(key5)); }else { deal =new BigDecimal(Double.toString(I)); } temp =percent.multiply(deal); bonus =bonus.add(temp); break; } } return bonus; } } package SU; import java.math.BigDecimal; import java.util.Scanner; public class BonusTest { public static void main(String[] args) { Scanner ints =new Scanner(System.in); System.out.println("请输入总利润来计算奖金；"); double I = ints.nextDouble(); ints.close(); Bonus b =new Bonus(); BigDecimal bd = b.Bonus(I); System.out.println(I+"元共计可获得奖金"+bd+"元。"); } } package SU; /** * @ClassName Judge * @Description 一个整数，它加上100后是一个完全平方数，再加上168又是一个完全平方数，请问该数是多少？ * @Author TumTam * @Date 2019/8/9 16:40 * @Version 1.0 **/ public class Judge { int count =0; public Judge(int num){ int n = num+100; int m = n+168; boolean x = PerfectSquareNumber(n); boolean y = PerfectSquareNumber(m); if(x==true && y==true){ System.out.print(num+" "); count ++; if(count%10==0){ System.out.println(); } } } public boolean PerfectSquareNumber(int num){ boolean b =false; for(int i=0; i<=(num/2);i++){ int temp = i*i; if(num==temp){ b=true; break; } } return b; } } package SU; import java.util.Scanner; public class JudgeTest { public static void main(String[] args) { System.out.println("请输入想找出多少以内符合条件的数："); Scanner max =new Scanner(System.in); int m = max.nextInt(); max.close(); System.out.println("符合条件的数有;"); for(int i=0;i<=m;i++){ Judge j =new Judge(i); } } } package SU; /** * @ClassName YearJudgment * @Description 输入某年某月某日，判断这一天是这一年的第几天？ * @Author TumTam * @Date 2019/8/12 8:28 * @Version 1.0 **/ public class YearJudgment { public YearJudgment(){} public YearJudgment(int year,int month,int day){ int J= Judgment(year,month,day); int total = day; for(int i=0;i<(month-1);i++){ total+= Judgment(year,1,day); } System.out.println("这一天是这一年的第"+total+"天"); } public int Judgment(int year,int month,int day){ int []array = {31,28,31,30,31,30,31,31,30,31,30,31}; if(month<=0|month>12){ return 0; }else{ if(year%4==0 | year % (-4) ==0){ array[1]=29; return array[month-1]; }else{ array[1]=28; return array[month-1]; } } } } package SU; import java.util.Scanner; public class YearJudgmentTest { public static void main(String[] args) { Scanner YMD =new Scanner(System.in); System.out.println("请输入年份："); int year = YMD.nextInt(); System.out.println("请输入月份："); int month = YMD.nextInt(); System.out.println("请输入具体日期："); int day = YMD.nextInt(); YMD.close(); YearJudgment yj =new YearJudgment(); if(yj.Judgment(year,month,day) ==0 ){ System.out.println("你输入的月份有误！"); }else if(day>yj.Judgment(year,month,day)|day<1){ System.out.println("你输入的日期有误！"); }else{ YearJudgment YJ =new YearJudgment(year,month,day); } } } package SU; /** * @ClassName Compare * @Description 输入三个整数x,y,z，请把这三个数由小到大输出。 * @Author TumTam * @Date 2019/8/12 14:37 * @Version 1.0 **/ public class Compare { public Compare(double a,double b,double c){ if(a>b){ if(a>c) { if(b>c){ System.out.println(a+">"+b+">"+c); }else{ System.out.println(a+">"+c+">"+b); } }else{ System.out.println(c+">"+a+">"+b); } }else{ if(a if(b System.out.println(c+">"+b+">"+a); }else{ System.out.println(b+">"+c+">"+a); } }else{ System.out.println(b+">"+a+">"+c); } } } } package SU; import java.util.Scanner; public class CompareTest { public static void main(String[] args) { Scanner number =new Scanner(System.in); double x=0; double y=0; double z=0; System.out.println("请输入三个数："); if(number.hasNextDouble()){ x = number.nextDouble(); y = number.nextDouble(); z = number.nextDouble(); }else{ System.out.println("你输入的不是数字！"); } number.close(); Compare c =new Compare(x,y,z); } } package SU; /** * @ClassName multiplication * @Description 输出9*9口诀。 * @Author TumTam * @Date 2019/8/12 15:06 * @Version 1.0 **/ public class Multiplication { public Multiplication(){ for(int i=1;i<=9;i++){ for(int j=1;j<=i;j++){ System.out.print(j+"*"+i+"="+(j*i)+" "); if(i==j){ System.out.println(); } } } } } package SU; public class multiplicationTest { public static void main(String[] args) { Multiplication Mp =new Multiplication(); } } package SU; /** * @ClassName Monkey * @Description 猴子吃桃问题： * 猴子第一天摘下若干个桃子，当即吃了一半，还不瘾，又多吃了一个 * 第二天早上又将剩下的桃子吃掉一半，又多吃了一个。 * 以后每天早上都吃了前一天剩下的一半零一个。 * 到第10天早上想再吃时，见只剩下一个桃子了。求第一天共摘了多少。 * @Author TumTam * @Date 2019/8/12 15:24 * @Version 1.0 **/ public class Monkey { int peach =0; public Monkey(){ for(int i=0;i<8;i++){ peach =(peach+1)*2; } System.out.println("第一天共摘了"+peach+"个桃子"); } } package SU; public class MonkeyTest { public static void main(String[] args) { Monkey m =new Monkey(); } } package SU; import java.util.Arrays; import java.util.List; /** * @ClassName Competition * @Description 两个乒乓球队进行比赛，各出三人。 * 甲队为a,b,c三人，乙队为x,y,z三人。 * 已抽签决定比赛名单。有人向队员打听比赛的名单。 * a说他不和x比，c说他不和x,z比，请编程序找出三队赛手的名单。 * @Author TumTam * @Date 2019/8/12 15:36 * @Version 1.0 **/ public class Competition { Stringa="a"; Stringb="b"; Stringc="c"; StringBuffersb =new StringBuffer(); StringBuffertemp =new StringBuffer(); Listlist1 = Arrays.asList("a","b","c"); Listlist2 = Arrays.asList("x","y","z"); int count =0; public Competition(){ while(sb.indexOf(a)==-1 ||sb.indexOf(b)==-1 ||sb.indexOf(c) ==-1){ if(count>=9){ sb.setLength(0); count=0; int a = (int) (Math.random()*3); String T =list1.get(a); int b; if(a+1>2){ b = a+1-2; }else{ b=a+1; } list1.set(a,list1.get(b)); list1.set(b,T); } for(String s:list1){ for(String k:list2){ if(sb.indexOf(s)==-1 &&sb.indexOf(k)==-1){ temp.setLength(0); temp.append(s); temp.append(k); String t =temp.toString(); if(!"ax".equals(t) && !"cx".equals(t) && !"cz".equals(t)){ sb.append(t); sb.append(" "); } } count++; } } } System.out.println(sb.toString()); } } package SU; public class CompetitionTest { public static void main(String[] args) { System.out.println("三队赛手的名单："); Competition c =new Competition(); } } package SU; /** * @ClassName PrintS * @Description 打印出如下图案（菱形） * * * * *** * ****** * ******** * ****** * *** * * * @Author TumTam * @Date 2019/8/13 8:28 * @Version 1.0 **/ public class PrintS { int star =1; public PrintS(){ for(int i=1;i<8;i++){ int a = Math.abs(i-4); for(int j=0;j System.out.print(" "); } for (int k=0;k System.out.print("*"); } System.out.println(); if(i<4){ star+=2; }else { star-=2; } } } } package SU; public class PrintSTest { public static void main(String[] args) { PrintS ps =new PrintS(); } } package SU; /** * @ClassName SumFraction * @Description 有一分数序列：2/1，3/2，5/3，8/5，13/8，21/13... 求出这个数列的前20项之和。 * @Author TumTam * @Date 2019/8/13 8:46 * @Version 1.0 **/ public class SumFraction { int sum =0 ; public SumFraction(int n){ int [] numerator =new int[n]; int [] denominator =new int[n]; numerator[0]=2; numerator[1]=3; denominator[0]=1; denominator[1]=2; for(int i=2;i numerator[i] = numerator[i-1]+numerator[i-2]; denominator[i] = denominator[i-1]+denominator[i-2]; } for(int j=0;j sum+=(numerator[j]/denominator[j]); } System.out.println(sum); } } package SU; import java.util.Scanner; public class SumFractionTest { public static void main(String[] args) { System.out.println("请输入想要求前几个数的和："); Scanner fra =new Scanner(System.in); int n = fra.nextInt(); fra.close(); SumFraction sf =new SumFraction(n); } } package SU; /** * @ClassName Factorial * @Description 求1+2!+3!+...+20!的和 * @Author TumTam * @Date 2019/8/16 14:56 * @Version 1.0 **/ public class Factorial { public int sum(int a){ int sum =0; for(int i=1;i<=a;i++){ sum = sum +factorial(i); } return sum; } public int factorial(int a){ int result=1; for(int i=1;i<=a;i++){ result = result*i; } return result; } } package SU; import java.util.Scanner; public class FactorialTest { public static void main(String[] args) { System.out.println("你想求前多少位的阶乘之和？"); Scanner s =new Scanner(System.in); int q = s.nextInt(); s.close(); Factorial f =new Factorial(); int sum = f.sum(q); System.out.println("前"+q+"位的阶乘之和为"+sum); } } package SU; /** * @ClassName RecursionFactorial * @Description 利用递归方法求5! * @Author TumTam * @Date 2019/8/16 15:11 * @Version 1.0 **/ public class RecursionFactorial { int c =1; public int count(int a){ if(a==1){ return c; }else { return a*count(a-1); } } } package SU; import java.util.Scanner; public class RecursionFactorialTest { public static void main(String[] args) { System.out.println("你想求谁的阶乘？"); Scanner sr =new Scanner(System.in); int v = sr.nextInt(); sr.close(); RecursionFactorial rf =new RecursionFactorial(); int s = rf.count(v); System.out.println(v+"的阶乘为"+s); } } package SU; /** * @ClassName RecursionProblem * @Description 有5个人坐在一起，问第五个人多少岁？ * 他说比第4个人大2岁。问第4个人岁数，他说比第3个人大2岁。 * 问第三个人，又说比第2人大两岁。问第2个人，说比第一个人大两岁。 * 最后问第一个人，他说是10岁。请问第五个人多大？ * @Author TumTam * @Date 2019/8/16 15:31 * @Version 1.0 **/ public class RecursionProblem { public int RecursionProblem(int a,int b){ if(a==1){ return 10; }else{ return RecursionProblem(a-1,b)+b; } } } package SU; public class RecursionProblemTest { public static void main(String[] args) { RecursionProblem rp =new RecursionProblem(); int a = rp.RecursionProblem(5,2); System.out.println("第五个人"+a+"岁"); } } package SU; import java.util.ArrayList; import java.util.List; /** * @ClassName PositiveInteger * @Description 给一个不多于5位的正整数， * 要求：一、求它是几位数，二、逆序打印出各位数字。 * @Author TumTam * @Date 2019/8/16 15:49 * @Version 1.0 **/ public class PositiveInteger { public PositiveInteger(int a){ int gw = a%10; int sw = (a/10)%10; int bw = (a/100)%10; int qw = (a/1000)%10; int ww = (a/10000)%10; List list =new ArrayList<>(16); if(ww !=0){ list.add(gw); } if(qw !=0){ list.add(sw); } if(bw !=0){ list.add(bw); } if(sw !=0){ list.add(qw); } if(gw !=0){ list.add(ww); } int length = list.size(); System.out.println("该数字为"+length+"位数。"); System.out.println("逆序输出结果为："); for(Integer l : list){ System.out.print(l); } } } package SU; import java.util.Scanner; public class PositiveIntegerTest { public static void main(String[] args) { System.out.println("请输入一个5位以内的数字："); Scanner sc =new Scanner(System.in); int shu = sc.nextInt(); sc.close(); PositiveInteger pi =new PositiveInteger(shu); } } package SU; import java.util.ArrayList; import java.util.List; /** * @ClassName PoInteger * @Description 一个5位数，判断它是不是回文数。 * 即12321是回文数，个位与万位相同，十位与千位相同。 * @Author TumTam * @Date 2019/8/19 11:23 * @Version 1.0 **/ public class PoInteger { public PoInteger(int a){ int gw = a%10; int sw = (a/10)%10; int bw = (a/100)%10; int qw = (a/1000)%10; int ww = (a/10000)%10; List list =new ArrayList<>(16); if(ww !=0){ list.add(gw); } if(qw !=0){ list.add(sw); } if(bw !=0){ list.add(bw); } if(sw !=0){ list.add(qw); } if(gw !=0){ list.add(ww); } int x= list.size()/2+1; int count =0; for(int i =0; i int j = list.size()-1-i; if(list.get(i).equals(list.get(j))){ count ++; } } if(count ==3){ System.out.println("这是一个回文数。"); }else { System.out.println("这不是一个回文数。"); } } } package SU; import java.util.Scanner; public class PoIntegerTest { public static void main(String[] args) { System.out.println("请输入一个5位数："); Scanner sc =new Scanner(System.in); int a = sc.nextInt(); sc.close(); PoInteger pi =new PoInteger(a); } } package SU; /** * @ClassName WeekJug * @Description 请输入星期几的第一个字母来判断一下是星期几， * 如果第一个字母一样，则继续判断第二个字母。 * @Author TumTam * @Date 2019/8/19 12:57 * @Version 1.0 **/ public class WeekJug { public StringFirWeekJug(String s){ StringD=""; switch (s){ case "m": D ="Monday"; break; case "w": D ="Wednesday"; break; case "f": D ="Friday"; break; case "t": D ="1"; break; case "s": D ="2"; break; } return D; } public StringSceWeekJug(String s){ StringD=""; switch (s) { case "u": D ="Tuesday"; break; case "h": D ="Thursday"; break; } return D; } public StringThrWeekJug(String s){ StringD=""; switch (s) { case "a": D ="Saturday"; break; case "u": D ="Sunday"; break; } return D; } } package SU; import java.util.Scanner; public class WeekJugTest { public static void main(String[] args) { System.out.println("请输入第一个字母："); Scanner sr =new Scanner(System.in); String s = sr.next(); WeekJug wj =new WeekJug(); String sc = wj.FirWeekJug(s); if("1"==sc ||"2"==sc){ System.out.println("请输入第二个字母："); s = sr.next(); sr.close(); if("1"==sc){ sc = wj.SceWeekJug(s); System.out.println(sc); }else{ sc = wj.ThrWeekJug(s); System.out.println(sc); } }else{ System.out.println(sc); } sr.close(); } } package SU; /** * @ClassName PrimeNumber * @Description 求100之内的素数 * @Author TumTam * @Date 2019/8/19 13:44 * @Version 1.0 **/ public class PrimeNumber { public PrimeNumber(int a){ int count=0; for(int i=3;i<=a;i++){ boolean b =true; for(int j =2;j<=(i-1);j++){ if((i%j)==0){ b =false; break; } } if(true == b){ System.out.print(i+" "); count++; if(count%20==0){ System.out.println(); } } } } } package SU; import java.util.Scanner; public class PrimeNumberTest { public static void main(String[] args) { System.out.println("你想求多少以内的素数："); Scanner sc =new Scanner(System.in); int a = sc.nextInt(); System.out.println(a+"之内的素数有："); System.out.print("1"+" "); PrimeNumber pn =new PrimeNumber(a); } } package SU; /** * @ClassName DeSort * @Description 对10个数进行排序 * @Author TumTam * @Date 2019/8/19 14:23 * @Version 1.0 **/ public class DeSort { public DeSort(int []a){题目3
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