import java.util.Scanner;
public class DisplayTime {
public static void main(String[] args) {
try (Scanner in = new Scanner(System.in)) {
int seconds = in.nextInt();
int hour = seconds/3600;
int leftSeconds = seconds - 3600*hour;
int min = leftSeconds/60;
int sec = leftSeconds%60;
System.out.printf("%02d:%02d:%02d",hour,min,sec);
}
}
}
//hour*100/100+":"+min*100/100+":"+sec*100/100
2 华氏温度转摄氏温度(FahrenheitToCelsius)
import java.util.Scanner;
public class FahrenheitToCelsius {
public static void main(String[] args) {
try (// TODO Auto-generated method stub
Scanner input = new Scanner(System.in)) {
System.out.printf("请输入华氏温度\n");
double fahrenheit = input.nextDouble();
double celsius = (fahrenheit - 32)*(5.0/9);
System.out.printf("摄氏温度为:%.2f\n",celsius);
}
}
}
3 分段计算水费(Water)
import java.util.Scanner;
public class Water {
public static void main(String[] args) {
try (// TODO Auto-generated method stub
Scanner inpute = new Scanner(System.in)) {
System.out.println("请输入x的值：");
double x = inpute.nextDouble();
if(x <= 15) {
System.out.printf("%.2f\n",4.0*x/3);
}else {
System.out.printf("%.2f\n",2.5*x-10.5);
}
}
}
}
4 冒泡排序(BubbleSort)
package homework;
import java.util.Scanner;
public class BubbleSort {
public static void main(String[] args) {
int []a = new int [10];
System.out.println("请输入10个无序数");
try (Scanner input = new Scanner (System.in)) {
for(int i=0;i<a.length;i++) {
int value = input.nextInt();
a[i] = value;
}
}
for(int i=0;i<a.length;i++) {
for(int j=i+1;j<a.length;j++) {
if(a[i]>a[j]) {
int temp = a[i];
a[i]=a[j];
a[j]=temp;
}
}
}
for(int i=0;i<a.length;i++) {
System.out.printf(a[i] + " ");
}
}
}
5 求两个数的最大公约数(CommonDivisor)
package homework;
import java.util.Scanner;
public class CommonDivisor {
public static void main(String[] args) {
System.out.println("请输入两个数：");
try (Scanner input = new Scanner (System.in)) {
int n1=input.nextInt();
int n2=input.nextInt();
System.out.println(commondivisor(n1,n2));
}
}
public static int commondivisor(int n1,int n2) {
int temp=0;
for(int i=1;i<=n1 && i<=n2;i++) {
if(n1%i == 0 && n2%i ==0) {
temp=i;
}
}
return temp;
}
}
6 生成 0~99 随机数(RandomDemo)
package homework;
import java.util.Random;
public class RandomDemo {
public static void main(String[] args) {
Random r = new Random();
int number = r.nextInt(100);
System.out.println(number);
}
}
7 判断回文串(CheckPalindrome)
package homework;
import java.util.Scanner;
public class CheckPalindrome {
public static void main(String[] args) {
System.out.println("请输入一个字符串:");
try (Scanner input = new Scanner(System.in)) {
String s0 = input.next();
if(s0.length() % 2 == 0) {
StringBuilder s1 = new StringBuilder(s0.substring(0, s0.length()/2));
StringBuilder s2 = new StringBuilder(s0.substring(s0.length()/2, s0.length()));
s2.reverse();
if(String.valueOf(s1).equals(String.valueOf(s2))) {
System.out.println("这是一个回文串");
}else {
System.out.println("这不是一个回文串");
}
}else {
StringBuilder s1 = new StringBuilder(s0.substring(0, s0.length()/2));
StringBuilder s2 = new StringBuilder(s0.substring(s0.length()/2 + 1, s0.length()));
s2.reverse();
if(String.valueOf(s1).equals(String.valueOf(s2))) {
System.out.println("这是一个回文串");
}else {
System.out.println("这不是一个回文串");
}
}
}
}
}
8 记事本(NoteBook)
package notebook;
import java.util.ArrayList;
public class NoteBook {
private ArrayList<String> notes = new ArrayList<String>();
public void add(String s) {
notes.add(s);
}
public int getSize() {
return notes.size();
}
public String getNote(int index) {
return notes.get(index);
}
public void removeNote(int index) {
notes.remove(index);
}
public String[] list() {
String[] a = new String[notes.size()];
notes.toArray(a);
return a;
}
public static void main(String[] args) {
NoteBook notebook = new NoteBook();
notebook.add("NO.1");
System.out.println(notebook.getNote(0));
notebook.add("No.2");
System.out.println(notebook.getNote(1));
notebook.removeNote(1);
System.out.println(notebook.getSize());
String[] a = notebook.list();
for(int i=0; i<notebook.getSize(); i++) {
System.out.println(a[i]);
}
}
}
