Java中的十进制到十六进制转换器
我有一个家庭作业,我需要做十进制、二进制和十六进制之间的三向转换。我需要帮助的函数是将十进制转换为十六进制。我几乎不了解十六进制,但是如何将十进制转换为十六进制。我需要一个函数,它接受一个Java中的十进制到十六进制转换器,java,hex,decimal,converter,Java,Hex,Decimal,Converter,我有一个家庭作业,我需要做十进制、二进制和十六进制之间的三向转换。我需要帮助的函数是将十进制转换为十六进制。我几乎不了解十六进制,但是如何将十进制转换为十六进制。我需要一个函数,它接受一个int dec并返回一个字符串hex。不幸的是,我没有这个函数的任何草稿,我完全迷路了。我只有这个 public static String decToHex(int dec) { String hex = ""; return hex; } 此外,我不能使用Integer.t
int dec
并返回一个字符串hex
。不幸的是,我没有这个函数的任何草稿,我完全迷路了。我只有这个
public static String decToHex(int dec)
{
String hex = "";
return hex;
}
此外,我不能使用Integer.toHexString()等预制函数,我需要实际制作算法,否则我不会学到任何东西。一种可能的解决方案:
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',
'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);
}
}
public String DecToHex(int dec){
char[] hexDigits = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'A', 'B', 'C', 'D', 'E', 'F'};
String hex = "";
while (dec != 0) {
int rem = dec % 16;
hex = hexDigits[rem] + hex;
dec = dec / 16;
}
return hex;
}
输出:
1234BABE
无论如何,这里有一个库方法:
String hex = Integer.toHexString(dec);
以下是任意数字的代码:
import java.math.BigInteger;
public class Testing {
/**
* @param args
*/
static String arr[] ={"0","1","2","3","4","5","6","7","8","9","A","B","C","D","E","F"};
public static void main(String[] args) {
String value = "214";
System.out.println(value + " : " + getHex(value));
}
public static String getHex(String value) {
String output= "";
try {
Integer.parseInt(value);
Integer number = new Integer(value);
while(number >= 16){
output = arr[number%16] + output;
number = number/16;
}
output = arr[number]+output;
} catch (Exception e) {
BigInteger number = null;
try{
number = new BigInteger(value);
}catch (Exception e1) {
return "Not a valid numebr";
}
BigInteger hex = new BigInteger("16");
BigInteger[] val = {};
while(number.compareTo(hex) == 1 || number.compareTo(hex) == 0){
val = number.divideAndRemainder(hex);
output = arr[val[1].intValue()] + output;
number = val[0];
}
output = arr[number.intValue()] + output;
}
return output;
}
}
我需要一个函数,它接受int-dec并返回字符串十六进制
我从中找到了一个更优雅的解决方案
. 我对原稿做了一些修改(参见编辑)
//前提条件:d是非负整数
公共静态字符串小数2Hex(int d){
字符串数字=“0123456789ABCDEF”;
如果(d0){
int digit=d%base;//最右边的数字
十六进制=数字。字符(数字)+十六进制;//字符串连接
d=d/基;
}
返回十六进制;
}
免责声明:我在我的编码面试中问这个问题。我希望这个解决方案不要太受欢迎:)
编辑2016年6月17日:我添加了base
变量,以便灵活地更改为任何基数:二进制、八进制、7进制。。。
根据评论,这个解决方案是最优雅的,所以我删除了
Integer.toHexString()
的实现
编辑2015年9月4日:我发现了一个更优雅的解决方案考虑下面的dec2m方法,将dec转换为十六进制、oct或bin 样本输出为
28十二月==11100箱
12月28日=10月34日
28十二月==1C十六进制
public class Conversion {
public static void main(String[] argv) {
int x = 28; // sample number
if (argv.length > 0)
x = Integer.parseInt(argv[0]); // number from command line
System.out.printf("%d dec == %s bin\n", i, dec2m(x, 2));
System.out.printf("%d dec == %s oct\n", i, dec2m(x, 8));
System.out.printf("%d dec == %s hex\n", i, dec2m(x, 16));
}
static String dec2m(int N, int m) {
String s = "";
for (int n = N; n > 0; n /= m) {
int r = n % m;
s = r < 10 ? r + s : (char) ('A' - 10 + r) + s;
}
return s;
}
}
公共类转换{
公共静态void main(字符串[]argv){
int x=28;//样本号
如果(argv.length>0)
x=Integer.parseInt(argv[0]);//来自命令行的数字
System.out.printf(“%d dec==%s bin\n”,i,dec2m(x,2));
System.out.printf(“%d dec==%s oct\n”,i,dec2m(x,8));
System.out.printf(“%d dec==%s hex\n”,i,dec2m(x,16));
}
静态字符串dec2m(整数N,整数m){
字符串s=“”;
对于(int n=n;n>0;n/=m){
int r=n%m;
s=r<10?r+s:(char)('A'-10+r)+s;
}
返回s;
}
}
另一种可能的解决方案:
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',
'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);
}
}
public String DecToHex(int dec){
char[] hexDigits = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'A', 'B', 'C', 'D', 'E', 'F'};
String hex = "";
while (dec != 0) {
int rem = dec % 16;
hex = hexDigits[rem] + hex;
dec = dec / 16;
}
return hex;
}
我会用
Long a = Long.parseLong(cadenaFinal, 16 );
因为有一些十六进制可能比intenger更大,它会抛出一个异常代码来将十进制转换为->二进制、八进制、十六进制
public class ConvertBase10ToBaseX {
enum Base {
/**
* Integer is represented in 32 bit in 32/64 bit machine.
* There we can split this integer no of bits into multiples of 1,2,4,8,16 bits
*/
BASE2(1,1,32), BASE4(3,2,16), BASE8(7,3,11)/* OCTAL*/, /*BASE10(3,2),*/
BASE16(15, 4, 8){
public String getFormattedValue(int val){
switch(val) {
case 10:
return "A";
case 11:
return "B";
case 12:
return "C";
case 13:
return "D";
case 14:
return "E";
case 15:
return "F";
default:
return "" + val;
}
}
}, /*BASE32(31,5,1),*/ BASE256(255, 8, 4), /*BASE512(511,9),*/ Base65536(65535, 16, 2);
private int LEVEL_0_MASK;
private int LEVEL_1_ROTATION;
private int MAX_ROTATION;
Base(int levelZeroMask, int levelOneRotation, int maxPossibleRotation) {
this.LEVEL_0_MASK = levelZeroMask;
this.LEVEL_1_ROTATION = levelOneRotation;
this.MAX_ROTATION = maxPossibleRotation;
}
int getLevelZeroMask(){
return LEVEL_0_MASK;
}
int getLevelOneRotation(){
return LEVEL_1_ROTATION;
}
int getMaxRotation(){
return MAX_ROTATION;
}
String getFormattedValue(int val){
return "" + val;
}
}
public void getBaseXValueOn(Base base, int on) {
forwardPrint(base, on);
}
private void forwardPrint(Base base, int on) {
int rotation = base.getLevelOneRotation();
int mask = base.getLevelZeroMask();
int maxRotation = base.getMaxRotation();
boolean valueFound = false;
for(int level = maxRotation; level >= 2; level--) {
int rotation1 = (level-1) * rotation;
int mask1 = mask << rotation1 ;
if((on & mask1) > 0 ) {
valueFound = true;
}
if(valueFound)
System.out.print(base.getFormattedValue((on & mask1) >>> rotation1));
}
System.out.println(base.getFormattedValue((on & mask)));
}
public int getBaseXValueOnAtLevel(Base base, int on, int level) {
if(level > base.getMaxRotation() || level < 1) {
return 0; //INVALID Input
}
int rotation = base.getLevelOneRotation();
int mask = base.getLevelZeroMask();
if(level > 1) {
rotation = (level-1) * rotation;
mask = mask << rotation;
} else {
rotation = 0;
}
return (on & mask) >>> rotation;
}
public static void main(String[] args) {
ConvertBase10ToBaseX obj = new ConvertBase10ToBaseX();
obj.getBaseXValueOn(Base.BASE16,12456);
// obj.getBaseXValueOn(Base.BASE16,300);
// obj.getBaseXValueOn(Base.BASE16,7);
// obj.getBaseXValueOn(Base.BASE16,7);
obj.getBaseXValueOn(Base.BASE2,12456);
obj.getBaseXValueOn(Base.BASE8,12456);
obj.getBaseXValueOn(Base.BASE2,8);
obj.getBaseXValueOn(Base.BASE2,9);
obj.getBaseXValueOn(Base.BASE2,10);
obj.getBaseXValueOn(Base.BASE2,11);
obj.getBaseXValueOn(Base.BASE2,12);
obj.getBaseXValueOn(Base.BASE2,13);
obj.getBaseXValueOn(Base.BASE2,14);
obj.getBaseXValueOn(Base.BASE2,15);
obj.getBaseXValueOn(Base.BASE2,16);
obj.getBaseXValueOn(Base.BASE2,17);
System.out.println(obj.getBaseXValueOnAtLevel(Base.BASE2, 4, 1));
System.out.println(obj.getBaseXValueOnAtLevel(Base.BASE2, 4, 2));
System.out.println(obj.getBaseXValueOnAtLevel(Base.BASE2, 4, 3));
System.out.println(obj.getBaseXValueOnAtLevel(Base.BASE2, 4, 4));
System.out.println(obj.getBaseXValueOnAtLevel(Base.BASE16,15, 1));
System.out.println(obj.getBaseXValueOnAtLevel(Base.BASE16,30, 2));
System.out.println(obj.getBaseXValueOnAtLevel(Base.BASE16,7, 1));
System.out.println(obj.getBaseXValueOnAtLevel(Base.BASE16,7, 2));
System.out.println(obj.getBaseXValueOnAtLevel(Base.BASE256, 511, 1));
System.out.println(obj.getBaseXValueOnAtLevel(Base.BASE256, 511, 2));
System.out.println(obj.getBaseXValueOnAtLevel(Base.BASE256, 512, 1));
System.out.println(obj.getBaseXValueOnAtLevel(Base.BASE256, 512, 2));
System.out.println(obj.getBaseXValueOnAtLevel(Base.BASE256, 513, 2));
}
}
公共类ConvertBase10Sex{
枚举基{
/**
*在32/64位计算机中,整数以32位表示。
*在那里,我们可以将这个整数位数拆分为1,2,4,8,16位的倍数
*/
BASE2(1,1,32),BASE4(3,2,16),BASE8(7,3,11)/*八进制*/,/*BASE10(3,2),*/
BASE16(15,4,8){
公共字符串getFormattedValue(int val){
开关(val){
案例10:
返回“A”;
案例11:
返回“B”;
案例12:
返回“C”;
案例13:
返回“D”;
案例14:
返回“E”;
案例15:
返回“F”;
违约:
返回“”+val;
}
}
},/*BASE32(31,5,1),*/BASE256(255,8,4),/*BASE512(511,9),*/Base65536(65535,16,2);
私有整数级0掩码;
私用整数级(1)轮换;;
私有int MAX_旋转;
基本(int-levelZeroMask、int-levelOneRotation、int-maxPossibleRotation){
this.LEVEL_0_MASK=levelzerosmask;
此.LEVEL_1_旋转=levelOneRotation;
this.MAX_ROTATION=maxPossibleRotation;
}
int getLevelZeroMask(){
返回级别0屏蔽;
}
int getLevelOneRotation(){
返回级_1_旋转;
}
int getMaxRotation(){
返回最大旋转;
}
字符串getFormattedValue(int val){
返回“”+val;
}
}
public void getBaseXValueOn(Base-Base,int-on){
转发打印(基于、基于);
}
私有void forwardPrint(基本,int on){
int rotation=base.getLevelOneRotation();
int mask=base.getLevelZeroMask();
int maxRotation=base.getMaxRotation();
布尔值found=false;
对于(int-level=maxRotation;level>=2;level--){
整数旋转1=(1级)*旋转;
int mask1=掩码0){
valueFound=true;
}
如果(找到值)
系统输出打印(base.getFormattedValue((on&mask1)>>>rotation1));
}
System.out.println(base.getFormattedValue((on&mask));
}
public int getbasexvalueonalevel(Base-Base、int-on、int-level){
if(level>base.getMaxRotation()| | level<1){
返回0;//输入无效
}
int rotation=base.getLevelOneRotation();
int mask=base.getLevelZeroMask();
如果(级别>1){
轮换=(1级)*轮换;
遮罩=遮罩>>旋转;
}
公共静态void main(字符串[]args){
ConvertBase10ToBaseX obj=新ConvertBase10ToBaseX();
对象getBaseXValueOn(Base.base1612456);
//对象getBaseXValueOn(Base.base16300);
//对象getBaseXValueOn(Base.BASE16,7);
//对象getBaseXValueOn(Base.BASE16,7);
对象getBaseXValueOn(Base.base212456);
对象getBaseXValueOn(Base.base812456);
public static String decToHex(int dec)
{
return Integer.toHexString(dec);
}
import java.util.Scanner;
public class DecimalToHexa
{
public static void main(String ar[])
{
Scanner sc=new Scanner(System.in);
System.out.println("Enter a Decimal number: ");
int n=sc.nextInt();
if(n<0)
{
System.out.println("Enter a positive integer");
return;
}
int i=0,d=0;
String hx="",h="";
while(n>0)
{
d=n%16;`enter code here`
n/=16;
if(d==10)h="A";
else if(d==11)h="B";
else if(d==12)h="C";
else if(d==13)h="D";
else if(d==14)h="E";
else if(d==15)h="F";
else h=""+d;
hx=""+h+hx;
}
System.out.println("Equivalent HEXA: "+hx);
}
}
import java.util.Scanner;
public class DecimalToHexadecimal
{
public static void main(String[] args)
{
int temp, decimalNumber;
String hexaDecimal = "";
char hexa[] = {'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
Scanner sc = new Scanner(System.in);
System.out.print("Please enter decimal number : ");
decimalNumber = sc.nextInt();
while(decimalNumber > 0)
{
temp = decimalNumber % 16;
hexaDecimal = hexa[temp] + hexaDecimal;
decimalNumber = decimalNumber / 16;
}
System.out.print("The hexadecimal value of " + decimalNumber + " is : " + hexaDecimal);
sc.close();
}
}
private static String decimalToHexaDecimal(int N) {
char hexaDecimals[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
StringBuilder builder = new StringBuilder();
int base= 16;
while (N != 0) {
int reminder = N % base;
builder.append(hexaDecimals[reminder]);
N = N / base;
}
return builder.reverse().toString();
}
String hexadecimalString = String.format("%x", integerValue);