十进制与十六进制、二进制、八进制之间的转换(Java)

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十进制与十六进制、二进制、八进制之间的转换

package com.test;public class ToHexBinOctDemo {/**移位法实现8进制，二进制，十进制转换 * @param args */public static void main(String[] args) {int num=13;//用Java内置函数与自定义函数输出结果进行对比System.out.println(Integer.toHexString(num));System.out.println(toHex(num));   System.out.println("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~");System.out.println(Integer.toBinaryString(num));System.out.println(toBin(num));System.out.println("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~");System.out.println(Integer.toOctalString(num));System.out.println(toOct(num));}   //查表发返回查询16进制的字符串public static char getCharHex(int index){char[] hexChars={'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};return hexChars[index];}//查表发返回查询2进制的字符串public static char getCharBin(int index){char[] binChars={'0','1'};return binChars[index];}   //转换成16进制，用的是移位4private static String toHex(int num) {StringBuffer sb=new StringBuffer();for(int i=0;i<8;i++){int temp=num & 15;//进行&操作（1111）2 =15num=num>>>4;sb.append(getCharHex(temp));   }//将反转之后的结果返回return new String(sb.reverse());}   //转换成2进制，移位1private static String toBin(int num){StringBuffer sb=new StringBuffer();while(num!=0){int index=num&1;//进行&操作（1）2 =1sb.append(getCharBin(index));num=num>>>1;}return new String(sb.reverse());}   //转换成8进制，用移位3；private static String toOct(int num){StringBuffer sb=new StringBuffer();while(num!=0){int index=num&7;//进行&操作（111）2 =7sb.append(index);num=num>>>3;}   return new String(sb.reverse());}}

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