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:140ED9 喜欢这样文章的可以关注我，我会持续更新，你们的关注是我更新的动力！需要更多java学习资料的也可以私信我！ 祝关注我的人都：身体健康，财源广进，福如东海,寿比南山，早生贵子，从不掉发!