【JAVA 课后习题 12.5】+ 自定义异常类

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package He;import java.util.Scanner;public class He {    public static void main(String[] args) {        Scanner input = new Scanner(System.in);        System.out.print("Enter a hex number : ");        String st = input.nextLine();        System.out.println("The decimal value for hex number " + st + " is " + hT(st));        }    public static int hT(String st){        int a = 0;        for(int i = 0 ; i < st.length(); i++){            char s = st.charAt(i);            try{                CH(s);            }            catch (Exception ex){ // 捕获异常                System.out.println("Error");            }            a = a * 16 + ZH(s);        }        return a;    }    public static int ZH(char s){        if(s >= 'A' && s <= 'F')            return 10 + s - 'A';        else            return s - '0';    }    public static void CH(char s)      throws Exception{ // 申明抛出异常        if(! ((s >= 'A' && s <= 'F') || (s >= '0' && s <= '9' )))            throw new Exception("Error");    }}

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