十进制转换成其他进制数

//十进制转换成其他进制数
class  Trans
{
public static void main(String[] args) 
{
int num = 60;
String str_bin = Tobinary(num);
String str_hex = Tohex(num);
String str_oct = Tooctal(num);
System.out.println(str_bin);
System.out.println(str_oct);
System.out.println(str_hex);
}


public static String Tobinary(int num)//十进制转换成二进制数
{
return trans(num,1,1);
}




public static String Tooctal(int num)//十进制转换成八进制数
{
return "0"+trans(num,7,3);
}




public static String Tohex(int num)//十进制转换成十六进制数
{
return "0x"+trans(num,15,4);
}

public static String trans(int num,int base,int offset)//查表法
{
char[] chs = {'0','1','2','3',
'4','5','6','7',
'8','9','A','B',
'C','D','E','F'};
char[] arr = new char[32];//给定容器
int index = arr.length;//定义数组索引，目的是解决输出时数据倒置
while(num != 0)
{
int temp = num & base;//取出num的后几位
arr[--index] = chs[temp];//查表显示取出的数据
num = num >>> offset;//num进行后移
}
return Tostring(arr,index);


}


public static String Tostring(char[] arr,int index)//将数组中数据转换成字符
{
String temp = "";
for (int x = index;x < arr.length;x++)
{
temp = temp + arr[x];
}
return temp;
}
}