java怎么实现十进制、八进制、十六进制数互相转换

java-十进制、八进制、十六进制数互相转换
下面是一个十进制、八进制、十六进制数互相转换的小程序
public class JZTurn {
 
    public static void main(String[] args) {
        int num2 = 1314521;
        System.out.println("十进制数:"+num2);
        System.out.println("十进制转换二进制:"+turn2(num2));
        System.out.println("十进制转换八进制:"+turn8(num2));
        System.out.println("十进制转换十六进制:"+turn16(num2));
         
        //2-> 8
        System.out.println("二进制转换八进制:"+twoTurnEight(turn2(num2)));
        System.out.println("八进制转换二进制:"+eightTurnTwo(turn8(num2)));
        System.out.println("八进制转换十六进制:"+eightTurnSixteen(turn8(num2)));
        //2->16
        System.out.println("二进制转换十六进制:"+twoTurnSixteen(turn2(num2)));
    }
     
    /
      10进制转二进制
      @param num
      @return
     /
    public static String turn2(int num){
        String shortTimeNum = "";
        int remainder = 0;
        /
          模拟短除法
         /
        while(num >= 1){
            remainder = num % 2;
            num = num / 2;
            shortTimeNum = remainder + shortTimeNum;
        }
         
        return shortTimeNum;
    }
     
    /
      10进制转8进制
      @param num
      @return
     /
    public static String turn8(int num){
        String shortTimeNum = "";
        int remainder = 0;
        /
          模拟短除法
         /
        while(num >= 1){
            remainder = num % 8;
            num = num / 8;
            shortTimeNum = remainder + shortTimeNum;
        }
         
        return shortTimeNum;
    }
     
    /
      10进制转16进制
      @param num
      @return
     /
    public static String turn16(int num){
        String shortTimeNum = "";
        int remainder = 0;
        String tempStr = "";
        /
          模拟短除法
         /
        while(num >= 1){
            remainder = num % 16;
            tempStr = getOtherNum(remainder);
             
            num = num / 16;
            shortTimeNum = tempStr + shortTimeNum;
        }
         
        return shortTimeNum;
    }
     
    /
      2进制转换8进制
      概念说明:这里转换的是整数,从右向左三位一组分别乘以2的零次方，2的一次方，2的2次方
      然后把每组中的数相加，再把各组从左向右拼接到一起
      @param strNum2
     /
    public static String twoTurnEight(String strNum2){
        String resultNum = "";
        int remainder = strNum2.length() % 3;
         
        //补位 三位一组,最后一组位数不够用0补充
        switch(remainder){
        case 1:
            strNum2 = "00"+strNum2;
            break;
        case 2:
            strNum2 = "0"+strNum2;
            break;
        }
        int index = strNum2.length()-1;
        int tempNum1 = 0;
        int tempNum2 = 0;
        int tempNum3 = 0;
        while(index>=1){
 
            index -- ;
             
            if(index % 3 == 0){
                //每个数为一组
                tempNum1 = Integer.parseInt(strNum2.substring(index, index+1));
                tempNum2 = Integer.parseInt(strNum2.substring(index+1, index+2));
                tempNum3 = Integer.parseInt(strNum2.substring(index+2, index+3));
                 
                resultNum = tempNum31+tempNum22+tempNum14+resultNum;
                 
            }
             
        }
         
        return resultNum;
    }
     
    /
      八进制转换二进制
      @param eightNum
      @return
     /
    public static String eightTurnTwo(String eightNum){
        String twoNum = "";
        int index = eightNum.length()-1;
         
        String tempNum = "";
        while(index>=0){
             
            tempNum = turn2(Integer.parseInt(eightNum.substring(index, index+1))) ;
             
            //补位,在转换8进制时是每三为二进制数为一组,转换回二进制时位数也需要是三位,不够用零补
            switch (tempNum.length()) {
             
            case 1:
                tempNum = "00"+tempNum;
                break;
 
            case 2:
                tempNum = "0"+tempNum;
                break;
            }
             
            twoNum = tempNum + twoNum;
            index--;
        }
         
        return twoNum;
    }
     
    /
      2进制转换16进制
      概念说明:这里转换的是整数,从右向左四位一组分别乘以2的零次方，2的一次方，2的2次方，2的3次方,
      然后相加把每组最终的得数一次从左向右拼到一起,若其中一组的和大于9,按照对应关系转换后再把每组的结果拼接到一起
      @param strNum2
     /
    public static String twoTurnSixteen(String strNum2){
        String resultNum = "";
        int remainder = strNum2.length() % 4;
         
        //补位,四位一组,最后一组位数不够用0补充
        switch(remainder){
        case 1:
            strNum2 = "000"+strNum2;
            break;
        case 2:
            strNum2 = "00"+strNum2;
            break;
        case 3:
            strNum2 = "0"+strNum2;
            break;
        }
        int index = strNum2.length()-1;
        int tempNum1 = 0;
        int tempNum2 = 0;
        int tempNum3 = 0;
        int tempNum4 = 0;
        int tempNum5 = 0;
        while(index>=1){
 
            index -- ;
             
            if(index % 4 == 0){
                //每个数为一组
                tempNum1 = Integer.parseInt(strNum2.substring(index, index+1));
                tempNum2 = Integer.parseInt(strNum2.substring(index+1, index+2));
                tempNum3 = Integer.parseInt(strNum2.substring(index+2, index+3));
                tempNum4 = Integer.parseInt(strNum2.substring(index+3, index+4));
                 
                tempNum5 = tempNum41 + tempNum32+tempNum24+tempNum1*8;
                 
                resultNum = getOtherNum(tempNum5) +resultNum;
                 
            }
             
        }
         
        return resultNum;
    }
     
    /*
      8进制转换16进制
      @param strNum2
     /
    public static String eightTurnSixteen(String strNum2){
        return twoTurnSixteen(eightTurnTwo(strNum2));
    }
     
    /
      16进制转换中的特殊处理,需要把大于9的数字转换成字母
      @param tempNum
      @return
     /
    public static String getOtherNum(int tempNum){
        String tempStr = "";
        if(tempNum > 9){
            switch(tempNum){
            case 10:
                tempStr = "A";
                break ;
            case 11:
                tempStr = "B";
                break;
            case 12:
                tempStr = "C";
                break;
            case 13:
                tempStr = "D";
                break;
            case 14:
                tempStr = "E";
                break;
            case 15:
                tempStr = "F";
                break;
            }
        }else{
            tempStr = String.valueOf(tempNum);
        }
        return tempStr;
    }
}
输出结果:
十进制数:1314521
十进制转换二进制:101000000111011011001
十进制转换八进制:5007331
十进制转换十六进制:140ED9
二进制转换八进制:5007331
八进制转换二进制:101111011011001
八进制转换十六进制:5ED9
二进制转换十六进制:140ED

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