十六进制转八进制蓝桥杯试题

import java.util.Scanner; public class Main { public static void main(String[] args) { // TODO Auto-generated method stub Scanner scanner = new Scanner(System.in); int n = scanner.nextInt(); String[] sts = new String[n+1]; for(int i=0;i<n;i++){ sts[i] = scanner.next(); } scanner.close(); for(int i=0;i<n;i++){ String strBinary = toBinary(sts[i]); int len_strBin = strBinary.length(); if(len_strBin%3==1) strBinary = "00" + strBinary; if(len_strBin%3==2) strBinary = "0" + strBinary; String strOctal = toOctal(strBinary); System.out.println(strOctal); } } private static String toOctal(String strBinary) { int len = strBinary.length(); int k; StringBuffer stb = new StringBuffer(); if(strBinary.substring(0, 3).equals("000")) k=3; else k=0; for(int i=k;i<len-2;i+=3){ String string = strBinary.substring(i,i+3); if(string.equals("000")) stb.append("0"); else if(string.equals("001")) stb.append("1"); else if(string.equals("010")) stb.append("2"); else if(string.equals("011")) stb.append("3"); else if(string.equals("100")) stb.append("4"); else if(string.equals("101")) stb.append("5"); else if(string.equals("110")) stb.append("6"); else if(string.equals("111")) stb.append("7"); /*switch (Integer.valueOf(strBinary.substring(i, i+3))) { case 000: stb.append("0"); break; case 001: stb.append("1"); break; case 010: stb.append("2"); break; case 011: stb.append("3"); break; case 100: stb.append("4"); break; case 101: stb.append("5"); break; case 110: stb.append("6"); break; case 111: stb.append("7"); break; default: break; }*/ } return stb.toString(); } private static String toBinary(String strHex) { int len_str = strHex.length(); StringBuffer stb = new StringBuffer(); for(int i=0;i<len_str;i++){ switch (strHex.charAt(i)) { case '0': stb.append("0000"); break; case '1': stb.append("0001"); break; case '2': stb.append("0010");break; case '3': stb.append("0011"); break; case '4': stb.append("0100"); break; case '5': stb.append("0101"); break; case '6': stb.append("0110"); break; case '7': stb.append("0111"); break; case '8': stb.append("1000"); break; case '9': stb.append("1001"); break; case 'A': stb.append("1010"); break; case 'B': stb.append("1011"); break; case 'C': stb.append("1100"); break; case 'D': stb.append("1101"); break; case 'E': stb.append("1110"); break; case 'F': stb.append("1111"); break; default: break; } } return stb.toString(); } }