Topic: Enter a line of characters and count the number of English letters, spaces, numbers and other characters.
import java.util.*;
public class countChars{
public static void main(String[] args) {
int digital = 0;
int character = 0;
int other = 0;
int blank = 0;
char[] ch = null;
Scanner sc = new Scanner(System.in);
String s = sc.nextLine();
ch = s.toCharArray();
for(int i=0; i<ch.length; i++) {
if(ch[i] >= '0' && ch[i] <= '9') {
digital ++;
} else if((ch[i] >= 'a' && ch[i] <= 'z') || ch[i] > 'A' && ch[i] <= 'Z') {
character ++;
} else if(ch[i]== ' ') {
blank ++;
} else {
other ++;
}
}
System.out.println("数字个数: " + digital);
System.out.println("英文字母个数: " + character);
System.out.println("空格个数: " + blank);
System.out.println("其他字符个数:" + other );
}
}
Input and output can also use IO input
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;
public static void main(String[] args) throws IOException {
BufferedReader str=new BufferedReader(new InputStreamReader(System.in));
System.out.println("请输入字符串：");
String art=str.readLine();
cal(art);//通过相同的方法判断字符
}
}