public?class?JZTurn {

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

int?num2 = 1314521;

System.out.println("十進制數:"+num2);

System.out.println("十進制轉換二進制:"+turn2(num2));

System.out.println("十進制轉換八進制:"+turn8(num2));

System.out.println("十進制轉換十六進制:"+turn16(num2));

//2-> 8

System.out.println("二進制轉換八進制:"+twoTurnEight(turn2(num2)));

System.out.println("八進制轉換二進制:"+eightTurnTwo(turn8(num2)));

System.out.println("八進制轉換十六進制:"+eightTurnSixteen(turn8(num2)));

//2->16

System.out.println("二進制轉換十六進制:"+twoTurnSixteen(turn2(num2)));

}

/**

* 10進制轉二進制

*/

public?static?String turn2(int?num){

String shortTimeNum = "";

int?remainder = 0;

/**

* 模擬短除法

*/

while(num >= 1){

remainder = num % 2;

num = num / 2;

shortTimeNum = remainder + shortTimeNum;

}

return?shortTimeNum;

}

/**

* 10進制轉8進制

*/

public?static?String turn8(int?num){

String shortTimeNum = "";

int?remainder = 0;

/**

* 模擬短除法

*/

while(num >= 1){

remainder = num % 8;

num = num / 8;

shortTimeNum = remainder + shortTimeNum;

}

return?shortTimeNum;

}

/**

* 10進制轉16進制

* @return

*/

public?static?String turn16(int?num){

String shortTimeNum = "";

int?remainder = 0;

String tempStr = "";

/**

* 模擬短除法

*/

while(num >= 1){

remainder = num % 16;

tempStr = getOtherNum(remainder);

num = num / 16;

shortTimeNum = tempStr + shortTimeNum;

}

return?shortTimeNum;

}

/**

* 2進制轉換8進制

* 概念說明:這里轉換的是整數,從右向左三位一組分別乘以2的零次方，2的一次方，2的2次方

* 然后把每組中的數相加，再把各組從左向右拼接到一起

* @param strNum2

*/

public?static?String twoTurnEight(String strNum2){

String resultNum = "";

int?remainder = strNum2.length() % 3;

//補位 三位一組,最后一組位數不夠用0補充

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){

//每個數為一組

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 = tempNum3*1+tempNum2*2+tempNum1*4+resultNum;

}

}

return?resultNum;

}

/**

* 八進制轉換二進制

* @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))) ;

//補位,在轉換8進制時是每三為二進制數為一組,轉換回二進制時位數也需要是三位,不夠用零補

switch?(tempNum.length()) {

case?1:

tempNum = "00"+tempNum;

break;

case?2:

tempNum = "0"+tempNum;

break;

}

twoNum = tempNum + twoNum;

index--;

}

return?twoNum;

}

/**

* 2進制轉換16進制

* 概念說明:這里轉換的是整數,從右向左四位一組分別乘以2的零次方，2的一次方，2的2次方，2的3次方,

* 然后相加把每組最終的得數一次從左向右拼到一起,若其中一組的和大于9,按照對應關系轉換后再把每組的結果拼接到一起

* @param strNum2

*/

public?static?String twoTurnSixteen(String strNum2){

String resultNum = "";

int?remainder = strNum2.length() % 4;

//補位,四位一組,最后一組位數不夠用0補充

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){

//每個數為一組

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 = tempNum4*1?+ tempNum3*2+tempNum2*4+tempNum1*8;

resultNum = getOtherNum(tempNum5) +resultNum;

}

}

return?resultNum;

}

/**

* 8進制轉換16進制

* @param strNum2

*/

public?static?String eightTurnSixteen(String strNum2){

return?twoTurnSixteen(eightTurnTwo(strNum2));

}

/**

* 16進制轉換中的特殊處理,需要把大于9的數字轉換成字母

* @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;

}

}

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