给定一个由数字组成的字符串,如:"12395868392",统计出每个数字出现的次数

public class ApperaNum {
		public static void main(String[] args) {
			Scanner scanner = new Scanner(System.in);
			System.out.println("输入纯数字的字符串：");
			String string = scanner.next();
			ApperaNum apperaNum = new ApperaNum();
			apperaNum.appNum(string);
		}
	
		public void appNum(String s) {
			
				char[] chr = s.toCharArray();
				for (int i = 0; i <= 9; i++) {
					int count = 0;
					for (int j = 0; j < chr.length; j++) {
						if(i == chr[j]-48) {
							count++;
						}
	
					}
					System.out.println(i+"出现的次数是"+count+"次");
			}
	}
		
}

将字符串变换为字符数组后，将字符转变为ASCll码与数字0到9进行比较。