1. Output ten random numbers within one hundred and sort them
package text;
import java.util.*;
public class c5 {
public static void main(String[] args) {
int arry[]=new int[10];
int random_num;
System.out.println("一百以内十个随机数:");
for(int i=0;i<arry.length;i++) {
random_num=(int)(Math.random()*100+1);
System.out.println(random_num);
arry[i]=random_num;
}
Arrays.sort(arry);
System.out.println("排序后：");
System.out.println(Arrays.toString(arry));
2. Flashback
public static void main(String[] args) {
int[] arr= {
1,2,3,4,5,6};
for(int i=0;i<arr.length-1;i++) {
System.out.print(arr[i]+" ");
}
System.out.println();
for(int i=0;i<=arr.length/2;i++) {
int temp=arr[i];
arr[i]=arr[arr.length-1-i];
arr[arr.length-1-i]=temp;
}
for(int i=0;i<=arr.length-1;i++)
System.out.println(arr[i]+"");
}
3. Fibonacci Sequence
public static void main(String[] args) {
int i=0,a=1,b=1;
int n;
Scanner read=new Scanner(System.in);
System.out.println("输入第几项：");
n=read.nextInt();
while(b<=n) {
System.out.println(" "+i+" "+a);
i=i+a;
a=i+a;
b=b+2;
}
System.out.println(i);
System.out.println(a);
System.out.println(b);
System.out.println();
}
4. Enter a string of letters and calculate the number of uppercase and lowercase letters output.
public static void main(String[] args) {
Scanner s=new Scanner(System.in);
System.out.println("请输入字符串：");
String worlds=s.next();
int d=0;
int x=0;
for(int i=0;i<worlds.length();i++) {
char c=worlds.charAt(i);
if(Character.isLowerCase(c)) {
x++;
}
else if(Character.isUpperCase(c)) {
d++;
}
}
System.out.println("小写字母："+x);
System.out.println("大写字母："+d);
}
