JAVA利用位移进行进制转换

class TransDemo

{

public static void main(String[] args)

{

int a = 8152936;

String res1 = toBin(a);

String res2 = toBa(a);

String res3 = toHex(a);

System.out.println(res1 + "\n"
+ res2 + "\n" + res3);

}

//十进制->二进制

public static String toBin(int num)

{

return trans(num, 1, 1);

}

//十进制->八进制

public static String toBa(int num)

{

return trans(num, 7, 3);

}

//十进制->十六进制

public static String toHex(int num)

{

return trans(num, 15, 4);

}

private static String trans(int num, int base,
int offset)

{

char [] table = {'0', '1', '2',
'3', '4', '5',

'6',
'7', '8', '9', 'A', 'B',

'C',
'D', 'E', 'F'};

char [] arr = new
char[32];

int pos = arr.length;

while (num != 0)

{

int x = num
& base;

arr[--pos] =
table[x];

num = num
>>> offset;

}

return arrayToString(arr,
pos);

}

private static String arrayToString(char[]
arr,int pos)

{

String s = "";

for (int x = pos; x
< arr.length; x++)

{

s = s +
arr[x];

}

return s;

}

}