输入一行字符，分别统计出其中英文字母、空格、数字和其它字符的个数

public class Tes07 {

public static void main(String[] args) {
    // TODO Auto-generated method stub
    System.out.println("输入一串字符：");
        Scanner input=new Scanner(System.in);
        String str=input.nextLine();
        int index = 0;
        char c;
        int count1=0;
        int count2=0;
        int count3=0;
        int count4=0;
        
        
        for(int i=0;i<str.length();i++) {
            c=str.charAt(index++);
        if(c>=65&&c<=90||c>=97&&c<=122){
            count1++;
        }else if(c==32){
            count2++;
        }else if(c>=48&&c<=57){
            count3++;
        }else {
            count4++;
        }
    }
        System.out.println(  "字母数："+count1
                            +"空格数："+count2
                            +"数字数："+count3
                            + "其他字符："+count4);
}

}

文章来源: https://blog.csdn.net/weixin_44944367/article/details/90241495