Java中的十进制到十六进制转换器 [英] Decimal to Hexadecimal Converter in Java

问题描述

我有一项家庭作业，需要在十进制，二进制和十六进制之间进行三向转换。我需要帮助的功能是将十进制转换为十六进制。我几乎没有理解十六进制，但如何将十进制转换为十六进制。我需要一个函数，它接受 int dec 并返回一个字符串十六进制。不幸的是我没有这个功能的草稿，我完全失去了。

  public static String decToHex（int dec）
 {
 String hex = ; 
 
 
 return hex; 
} 
  

另外我不能使用Integer.toHexString（）或任何事情，我需要实际制作算法，否则我不会学到任何东西。

解决方案

一个可能的解决方案：

  import java.lang.StringBuilder; 
 
 class Test {
 private static final int sizeOfIntInHalfBytes = 8; 
 private static final int numberOfBitsInAHalfByte = 4; 
 private static final int halfByte = 0x0F; 
 private static final char [] hexDigits = {
'0'，'1'，'2'，'3'，'4'，'5'，'6'，'7'，$ b'b'8'，'9'，'A'，'B'，'C'，'D'，'E'，'F'
}; 
 
 public static String decToHex（int dec）{
 StringBuilder hexBuilder = new StringBuilder（sizeOfIntInHalfBytes）; 
 hexBuilder.setLength（sizeOfIntInHalfBytes）; 
 for（int i = sizeOfIntInHalfBytes  -  1; i> = 0; --i）
 {
 int j = dec& halfByte; 
 hexBuilder.setCharAt（i，hexDigits [j]）; 
 dec>> = numberOfBitsInAHalfByte; 
} 
 return hexBuilder.toString（）; 
 
 
 public static void main（String [] args）{
 int dec = 305445566; 
字符串十六进制= decToHex（十进制）; 
 System.out.println（hex）; 
 
 
 $ / code $ / pre 
 $ b $输出：
 
 
  1234BABE 
  
无论如何，库方法： 
 
 
 字符串十六进制= Integer.toHexString（十进制）; 
  
 
I have a homework assignment where I need to do three-way conversion between decimal, binary and hexadecimal. The function I need help with is converting a decimal into a hexadecimal. I have nearly no understanding of hexadecimal, nonetheless how to convert a decimal into hex. I need a function that takes in an int dec and returns a String hex. Unfortunately I don't have any draft of this function, I'm completely lost. All I have is this.
  public static String decToHex(int dec)
  {
    String hex = "";


    return hex;
  }
Also I can't use those premade functions like Integer.toHexString() or anything, I need to actually make the algorithm or I wouldn't have learned anything.
解决方案
One possible solution:
import java.lang.StringBuilder;

class Test {
  private static final int sizeOfIntInHalfBytes = 8;
  private static final int numberOfBitsInAHalfByte = 4;
  private static final int halfByte = 0x0F;
  private static final char[] hexDigits = { 
    '0', '1', '2', '3', '4', '5', '6', '7', 
    '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
  };

  public static String decToHex(int dec) {
    StringBuilder hexBuilder = new StringBuilder(sizeOfIntInHalfBytes);
    hexBuilder.setLength(sizeOfIntInHalfBytes);
    for (int i = sizeOfIntInHalfBytes - 1; i >= 0; --i)
    {
      int j = dec & halfByte;
      hexBuilder.setCharAt(i, hexDigits[j]);
      dec >>= numberOfBitsInAHalfByte;
    }
    return hexBuilder.toString(); 
  }

  public static void main(String[] args) {
     int dec = 305445566;
     String hex = decToHex(dec);
     System.out.println(hex);       
  }
}
Output:
1234BABE
Anyway, there is a library method for this: 
String hex = Integer.toHexString(dec);


                        
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