简单任意进制转换_JAVA_编程开发_程序员俱乐部

class="java" name="code">
import java.util.HashMap;
import java.util.Map;

/**
 * @author QuarterLifeForJava
 * V0.2初级版本（你绝对可以写的更好）
 * [只支持正整数，只简单进行了非法输入的判断]
 * N进制到N进制转换:N进制->10进制->N进制
 */
public class Test {
	
	//自定义字符集
	public static final char[] CHARACTERSET = new char[]{
			'0','1','2','3','4','5','6','7','8','9',
			'a','b','c','d','e','f','g','h','i','j',
			'k','l','m','n','o','p','q','r','s','t',
			'u','v','w','x','y','z','A','B','C','D',
			'E','F','G','H','I','J','K','L','M','N',
			'O','P','Q','R','S','T','U','V','W','X',
			'Y','Z','`','~','!','@','#','$','%','^',
			'&','*','(',')','-','_','=','+','{','}',
			'[',']',';',':','"','\'','\\','|','?','.',
			'/','<','>','您','好','世','界'
	};
	
	//自定义字符键(字符)值(十进制值)对
	//`~!@#$%^&*()-_=+{}[];:\"'\\|?.'/<>您好世界
	public static final Map<String,String> CHARACTEKV = new HashMap<String,String>();
	static{
		CHARACTEKV.put("0", "0");CHARACTEKV.put("1", "1");CHARACTEKV.put("2", "2");
		CHARACTEKV.put("3", "3");CHARACTEKV.put("4", "4");CHARACTEKV.put("5", "5");
		CHARACTEKV.put("6", "6");CHARACTEKV.put("7", "7");CHARACTEKV.put("8", "8");
		CHARACTEKV.put("9", "9");CHARACTEKV.put("a", "10");CHARACTEKV.put("b", "11");
		CHARACTEKV.put("c", "12");CHARACTEKV.put("d", "13");CHARACTEKV.put("e", "14");
		CHARACTEKV.put("f", "15");CHARACTEKV.put("g", "16");CHARACTEKV.put("h", "17");
		CHARACTEKV.put("i", "18");CHARACTEKV.put("j", "19");CHARACTEKV.put("k", "20");
		CHARACTEKV.put("l", "21");CHARACTEKV.put("m", "22");CHARACTEKV.put("n", "23");
		CHARACTEKV.put("o", "24");CHARACTEKV.put("p", "25");CHARACTEKV.put("q", "26");
		CHARACTEKV.put("r", "27");CHARACTEKV.put("s", "28");CHARACTEKV.put("t", "29");
		CHARACTEKV.put("u", "30");CHARACTEKV.put("v", "31");CHARACTEKV.put("w", "32");
		CHARACTEKV.put("x", "33");CHARACTEKV.put("y", "34");CHARACTEKV.put("z", "35");
	}
	
	/**
	 * 十进制转化成任意进制数(辗转相除取余法)
	 * @param decimal 十进制数
	 * @param arbitraryHexadecimal 想转换成的进制数
	 * @param characterSet 自定义字符集 
	 * @return String
	 */
	public static String decimal2AnyDecimal(long decimal,int arbitraryHexadecimal,char characterSet[]){
		int characterSetLength = characterSet.length;
		if(arbitraryHexadecimal>characterSetLength){
			return "您的字符集的个数:"+characterSetLength+",不能小于"+"您所要转换成的进制数:"+arbitraryHexadecimal;
		}
		StringBuilder sb = new StringBuilder();
		//余数初始化
		int remainder = 0;
		while(decimal > 0){
			remainder = (int)decimal%arbitraryHexadecimal;
			sb.append(characterSet[remainder]);
			decimal/=arbitraryHexadecimal;
		}				
		return sb.reverse().toString();
	}
	
	/**
	 * 任意进制数转化成十进制
	 * @param AnyDecimal 输入一个任意进制数
	 * @param arbitraryHexadecimal 是几进制数
	 * @param characteKV 自定义字符键(字符)值(十进制值)对 
	 * @return long
	 */
	public static String AnyDecimal2decimal(String anyDecimal,int arbitraryHexadecimal,Map<String,String> characteKV){
		int anyDecimalOfLength = anyDecimal.length();
		long total = 0;
		long number = 0;
		for (int j = anyDecimalOfLength-1; j > -1; j--){
			String value = characteKV.get(String.valueOf(anyDecimal.charAt(j)));
			if(value==null){
				return "进制数:"+anyDecimal+"中的"+anyDecimal.charAt(j)+"未自定义在字符键(字符)值(十进制值)对中";
			}
			number = (Integer.parseInt(value))*square(arbitraryHexadecimal, anyDecimalOfLength-j-1);
			total = total + number;
		}
		return String.valueOf(total);
	}
	
	/**
	 * 递归求次幂
	 * @param baseNumber>=0   底数
	 * @param indexNumber>=0  指数
	 * @return int
	 */
	public static int square(int baseNumber,int indexNumber){
		if(baseNumber==0){
			return 0;
		}else if(indexNumber==0){
			return 1;
		}else{
			return baseNumber*square(baseNumber,--indexNumber);
		}
	}
	
}