JAVA编程：将输入的16进制数字串转为10进制数并输出。 java怎么把16进制的数转换为10进制的
java\u7a0b\u5e8f \u8f93\u5165\u6570\u5b57\u5b57\u7b26\u4e32\u8f6c\u6362\u6210\u5341\u8fdb\u5236\u6570\u5e76\u8f93\u51faimport java.util.Scanner;
public class Test{
public static void main(String args[]){
System.out.println("\u8bf7\u8f93\u5165\u4e00\u4e2a\u6570\u5b57\uff1a");
Scanner in = new Scanner(System.in);
System.out.println("\u60a8\u8f93\u5165\u7684\u6570\u5b57\u662f\uff1a"+in.nextLong());
}
}
\u8fd0\u884c\u7ed3\u679c\uff1a
\u8bf7\u8f93\u5165\u4e00\u4e2a\u6570\u5b57\uff1a
123456789
\u60a8\u8f93\u5165\u7684\u6570\u5b57\u662f\uff1a123456789
\u4f7f\u7528java.math.BigInteger
\u6784\u9020\u51fd\u6570BigInteger(String val, int radix) \uff1a \u5c06\u6307\u5b9a\u57fa\u6570\u7684 BigInteger \u7684\u5b57\u7b26\u4e32\u8868\u793a\u5f62\u5f0f\u8f6c\u6362\u4e3a BigInteger\u3002
new BigInteger("01040000000100000001010000005B94D910DE8F1E41ED66466", 16).toString()\u5373\u53ef
在main方法中直接调用即可，代码如下：
public static void main(String[] args) {
HexToDec("1e6f");
}
/**
* 将十六进制的字符串转化为十进制的数值
*/
public static long HexToDec(String hexStr) {
Map<String, Integer> hexMap = prepareDate(); // 先准备对应关系数据
int length = hexStr.length();
long result = 0L; // 保存最终的结果
for (int i = 0; i < length; i++) {
result += hexMap.get(hexStr.subSequence(i, i + 1)) * Math.pow(16, length - 1 - i);
}
System.out.println("hexStr=" + hexStr + ",result=" + result);
return result;
}
/**
* 准备十六进制字符对应关系。如("1",1)...("A",10),("B",11)
*/
private static HashMap<String, Integer> prepareDate() {
HashMap<String, Integer> hashMap = new HashMap<String, Integer>();
for (int i = 1; i <= 9; i++) {
hashMap.put(i + "", i);
}
hashMap.put("a", 10);
hashMap.put("b", 11);
hashMap.put("c", 12);
hashMap.put("d", 13);
hashMap.put("e", 14);
hashMap.put("f", 15);
return hashMap;
}
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