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js轉(zhuǎn)換java代碼實(shí)現(xiàn),java代碼轉(zhuǎn)換器

js組合算法代碼轉(zhuǎn)成java代碼

不必轉(zhuǎn)換,我早已熟透組合排列算法:java如下

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import?java.util.Arrays;

import?java.util.LinkedList;

public?class?Guy

{

public?static?void?recursionSub?(?LinkedListint[]?list,?int?count,?int[]?array,?int?ind,?int?start,?int...?indexs?)

{

start++;

if?(start??count?-?1)

{

return;

}

if?(start?==?0)

{

indexs?=?new?int[array.length];

}

for?(?indexs?=?ind;?indexs??array.length;?indexs++?)

{

recursionSub?(list,?count,?array,?indexs?+?1,?start,?indexs);

if?(start?==?count?-?1)

{

int[]?temp?=?new?int[count];

for?(?int?i?=?count?-?1;?i?=?0;?i--?)

{

temp[start?-?i]?=?array[indexs[start?-?i]];

}

list.add?(temp);

}

}

}

public?static?void?main?(?String[]?args?)

{

int[]?array?=?{?1,?2,?3,?4,?5,?6,?7,?8,?9?};

LinkedListint[]?list?=?new?LinkedListint[]?();

recursionSub?(list,?3,?array,?0,?-1);

for?(?int[]?strings?:?list?)

{

System.out.println?(Arrays.toString?(strings));

}

}

}

如何將這些JS代碼轉(zhuǎn)換成JAVA代碼

javascript 和java都不是一個(gè)道理的,不是說(shuō)轉(zhuǎn)換就可以的,為什么很多人喜歡跨語(yǔ)言轉(zhuǎn)換代碼,你們?yōu)槭裁床荒苓@樣問(wèn)呢:如何用java來(lái)實(shí)現(xiàn)某種功能,豈不是更好?

一個(gè)js方法轉(zhuǎn)換為java代碼

package p1;

import java.util.Arrays;

import java.util.LinkedList;

public class Guy

{

public static void recursionSub ( LinkedListint[] list, int count, int[] array, int ind, int start, int... indexs )

{

start++;

if (start count - 1)

{

return;

}

if (start == 0)

{

indexs = new int[array.length];

}

for ( indexs = ind; indexs array.length; indexs++ )

{

recursionSub (list, count, array, indexs + 1, start, indexs);

if (start == count - 1)

{

int[] temp = new int[count];

for ( int i = count - 1; i = 0; i-- )

{

temp[start - i] = array[indexs[start - i]];

}

list.add (temp);

}

}

}

public static void main ( String[] args )

{

int[] array = { 1, 2, 3, 4, 5, 6, 7, 8, 9 };

LinkedListint[] list = new LinkedListint[] ();

recursionSub (list, 3, array, 0, -1);

for ( int[] strings : list )

{

System.out.println (Arrays.toString (strings));

}

}

}

js代碼轉(zhuǎn)換為java

理解他的原理就好寫(xiě)了。

所有參數(shù)?排除?時(shí)間戳,按照字母順序排序,然后連接起來(lái)?和?appKey?以及?appSercet?進(jìn)行md5?運(yùn)算。

排序可以使用?String?[]keys?=?map.keyset().toarray()?獲取后使用?Collections?進(jìn)行sort。

有個(gè)類(lèi)似的,可以參考一下:

public?static?boolean?signVerify(String?appSecret,MapString,?String?params){

MapString,?String?map=new?HashMapString,?String();

map.put("appSecret",?appSecret);

for(String?key:params.keySet()){

if(!key.equals("sign")){

map.put(key,?params.get(key));

}

}

String?sign=sign(map);

if(sign.equals(params.get("sign"))){

return?true;

}

return?false;

}

private?static?String?toHexValue(byte[]?messageDigest)?{

if?(messageDigest?==?null)

return?"";

StringBuilder?hexValue?=?new?StringBuilder();

for?(byte?aMessageDigest?:?messageDigest)?{

int?val?=?0xFF??aMessageDigest;

if?(val??16)?{

hexValue.append("0");

}

hexValue.append(Integer.toHexString(val));

}

return?hexValue.toString();

}

/**

?*?

?*?@param?params

?*?@return

?*/

public?static?String?sign(MapString,String?params){

ListString?keys=new?ArrayListString(params.keySet());

Collections.sort(keys);

String?string="";

for(String?s:keys){

string+=params.get(s);

}

String?sign="";

try?{

sign?=?toHexValue(encryptMD5(string.getBytes(Charset.forName("utf-8"))));

}?catch?(Exception?e)?{

e.printStackTrace();

throw?new?RuntimeException("md5?error");

}

return?sign;

}

private?static?byte[]?encryptMD5(byte[]?data)throws?Exception{

MessageDigest?md5?=?MessageDigest.getInstance("MD5");

md5.update(data);

return?md5.digest();

}

public?static?void?main(String[]?args)?{

String?appKey="key";

String?appSecret="secret";

MapString,?String?params=new?HashMapString,?String();

params.put("appKey",?appKey);

params.put("appSecret",?appSecret);

params.put("date",?new?Date().getTime()+"");

String?sign=sign(params);

params.put("sign",?sign);

System.out.println(signVerify(appSecret,?params));

}

如何將這個(gè) Javascript 代碼轉(zhuǎn)換為 Java

做不到. java和js僅僅是名字和語(yǔ)法長(zhǎng)得有點(diǎn)像, 但兩者是完全獨(dú)立的兩種語(yǔ)言, 兩者的功能和基礎(chǔ)api都完全不同. 這意味著你想把js代碼移植到j(luò)ava里不僅僅是要進(jìn)行語(yǔ)法上的翻譯, 還要把js里的各種基本函數(shù)都在java里實(shí)現(xiàn)一次, 例如你給的鏈接里的圖形顯示js是利用操作html元素和css實(shí)現(xiàn)的, 而在java里根本沒(méi)有這種東西, 想實(shí)現(xiàn)相同的功能基本要完全重寫(xiě)

java也可以在網(wǎng)頁(yè)上調(diào)用js, 但既然這里已經(jīng)用js都實(shí)現(xiàn)了, 再用java包一遍并沒(méi)有意義

js轉(zhuǎn)java代碼

package p1;

import java.util.Arrays;

import java.util.LinkedList;

public class Guy

{

public static void recursionSub ( LinkedListint[] list, int count, int[] array, int ind, int start, int... indexs )

{

start++;

if (start count - 1)

{

return;

}

if (start == 0)

{

indexs = new int[array.length];

}

for ( indexs = ind; indexs array.length; indexs++ )

{

recursionSub (list, count, array, indexs + 1, start, indexs);

if (start == count - 1)

{

int[] temp = new int[count];

for ( int i = count - 1; i = 0; i-- )

{

temp[start - i] = array[indexs[start - i]];

}

list.add (temp);

}

}

}

public static void main ( String[] args )

{

int[] array = { 1, 2, 3, 4, 5, 6, 7, 8, 9 };

LinkedListint[] list = new LinkedListint[] ();

recursionSub (list, 3, array, 0, -1);

for ( int[] strings : list )

{

System.out.println (Arrays.toString (strings));

}

}

}

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