Java 16进制转10进制

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牛课网上的题目

char '1'和 int 1给我好好上了一课

package suanfa;import java.util.*;
public class Main{
public static void main(String[] args){
Scanner in = new Scanner(System.in);
while(in.hasNext()){
String s = in.nextLine();
s = s.substring(2);
int l = s.length();
char[] ch = s.toCharArray();
int sum = 0;
int j = 1;
int temp = 0;
for(int i = l-1; i >= 0; i--){
if(ch[i] == 'A'){
temp = 10;
}
else if(ch[i] == 'B'){
temp = 11;
}
else if(ch[i] == 'C'){
temp = 12;
}
else if(ch[i] == 'D'){
temp = 13;
}
else if(ch[i] == 'E'){
temp = 14;
}
else if(ch[i] == 'F'){
temp = 15;
}
else{
temp = (int)ch[i] - (int)'0';
//一开始直接 temp = ch[i]得到的是ASCII码
}
//System.out.println(ch[i]);
//System.out.println(sum);
//System.out.println(j);
//System.out.println(temp);
sum=sum + j*temp; j = j*16; }
System.out.println(sum); }
}
}