public static void main(String[] args) {
        //输入字符串，判断里面有多少个大写字母，多少小写字母，多少数字
        countVary("fsdfsD4f4sf￥#￥%~&*！@sg9tssfffSFSFS");
    }
    public static void countVary(String scr){
        int countUppper = 0;
        int countLower = 0;
        int countDigital = 0;
        int countOther = 0;
        if(scr==null){
            throw  new RuntimeException("输入字符串不能为空！");
        }
        StringBuffer buf = new StringBuffer(scr);
        char[] scrChar = scr.toCharArray();
        for (int i = 0; i < scrChar.length; i++) {
            if(scrChar[i]>='a'&&scrChar[i]<='z'){
                countLower++;
            }
            else if(scrChar[i]>='A'&&scrChar[i]<='Z'){
                countUppper++;
            }
            else if (scrChar[i]>='0'&&scrChar[i]<='9'){
                countDigital++;
            }else{
                countOther++;
            }
        }
        System.out.println("字符串："+scr+"\n大写字母有："
                +countUppper+"个"+"\n小写字母有："+countLower+"个"+"\n数字有："
                +countDigital+"个"+"\n其他字符有："+countOther+"个"+"\n共计："+scr.length()+"个字符");
    }