解题思路:读取一行字符,遍历每个字符,定义计数器
注意事项:注意读取空格
参考代码:import java.util.Scanner;
public class Main {
static Scanner sc = new Scanner(System.in);
public static void main(String[] args) {
String line = sc.nextLine();
int n = 0;
int z = 0;
int k = 0;
int q = 0;
for (int i = 0; i < line.length(); i++) {
char c = line.charAt(i);
if (c >= 'a' && c <= 'z' || c >= 'A' && c <= 'Z')
z++;
else if (c >= '0' && c <= '9')
n++;
else if(c ==' ')
k++;
else
q++;
}
System.out.println(z);
System.out.println(k);
System.out.println(n);
System.out.println(q);
}
}
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