Java之查表法实现进制转换

/*
层层深入，步步为赢
*/
class BinaryTest2
{
//通过查表法,实现十进制转变成十六进制
public static void main(String[] args)
{
toHex_1(60);
toHex_2(60);
toHex_3(60);
toHex_4(60);
toHex_5(60);
toHex_6(60);
toHex_7(60);
toHex_8(60);
toHex_9(60);
}
//查表法；步骤一
public static void toHex_1(int num)
{
char[] ch = {'0','1','2','3'
,'4','5','6','7'
,'8','9','A','B'
,'C','D','E','F'};
for (int x = 0;x<8 ;x++ )
{
int temp = num & 15;
//这里是按照角标取得的值,所以这里不需要判断
System.out.print(ch[temp]);
num = num >>> 4;
}
System.out.println();
}
//查表法:步骤二
public static void toHex_2(int num)
{
char[] ch = {'0','1','2','3'
,'4','5','6','7'
,'8','9','A','B'
,'C','D','E','F'};
//定义一个临时容器
char[] cha = new char[8];
for (int x = 0;x<8 ;x++ )
{
/*
步骤：
1，首先将数字1111“&”一下
2，将临时数据存储到临时的容器中
3，然后在将数字右移
*/
int temp = num & 15;
//System.out.print(ch[temp]);
cha[x] = ch[temp];//将每一个最低的四位数字，计算出来，存到临时的容器当中
num = num >>> 4;
System.out.print(cha[x]);
}
System.out.println();
}
//查表法：步骤三
public static void toHex_3(int num)
{
char[] ch = {'0','1','2','3'
,'4','5','6','7'
,'8','9','A','B'
,'C','D','E','F'};
//定义一个临时容器
char[] cha = new char[8];//此默认初始化的值为："\u0000"，相当于一个空位
for (int x = 0;x<8;x++)
{
int temp = num & 15;
//System.out.print(ch[temp]);
cha[x] = ch[temp];//往里面传输数据的时候，指针是在移动的
num = num >>> 4;
}
//遍历输出临时存储容器中的所存储的东西
//将数据从最后位输出
for (int x = cha.length-1;x >= 0 ;x-- )
{
System.out.print(cha[x]+" ");
}
System.out.println();
}
//查表法:步骤四
public static void toHex_4(int num)
{
char[] ch = {'0','1','2','3'
,'4','5','6','7'
,'8','9','A','B'
,'C','D','E','F'};
//定义一个临时容器
char[] cha = new char[8];//此默认初始化的值为："\u0000"，相当于一个空位
int poster = 0;
while (num != 0)
{
int temp = num & 15;
//System.out.print(ch[temp]);
cha[poster++] = ch[temp];//往里面传输数据的时候，指针是在移动的
num = num >>> 4;
}
//遍历输出临时存储容器中的所存储的东西
//将数据从最后位输出
for (int x = cha.length-1;x >= 0 ;x-- )
{
System.out.print(cha[x]+",");
}
System.out.println();
}
//查表法:步骤五
public static void toHex_5(int num)
{
char[] ch = {'0','1','2','3'
,'4','5','6','7'
,'8','9','A','B'
,'C','D','E','F'};
//定义一个临时容器
char[] cha = new char[8];//此默认初始化的值为："\u0000"，相当于一个空位
int poster = 0;
while (num != 0)
{
int temp = num & 15;
//System.out.print(ch[temp]);
cha[poster++] = ch[temp];//往里面传输数据的时候，指针是在移动的
num = num >>> 4;
}
//遍历输出临时存储容器中的所存储的东西
//将数据从最后位输出
for (int x = poster;x >= 0 ;x-- )
{
System.out.print(cha[x]+",");
}
System.out.println();
}
//查表法:步骤六
public static void toHex_6(int num)
{
char[] ch = {'0','1','2','3'
,'4','5','6','7'
,'8','9','A','B'
,'C','D','E','F'};
//定义一个临时容器
char[] cha = new char[8];//此默认初始化的值为："\u0000"，相当于一个空位
int poster = 0;
while (num != 0)
{
int temp = num & 15;
//System.out.print(ch[temp]);
cha[poster++] = ch[temp];//往里面传输数据的时候，指针是在移动的
num = num >>> 4;
}
//遍历输出临时存储容器中的所存储的东西
//将数据从最后位输出
for (int x = poster-1;x >= 0 ;x-- )
{
System.out.print(cha[x]+",");
}
System.out.println();
}
//查表法:步骤七
public static void toHex_7(int num)
{
char[] ch = {'0','1','2','3'
,'4','5','6','7'
,'8','9','A','B'
,'C','D','E','F'};
//定义一个临时容器
char[] cha = new char[8];//此默认初始化的值为："\u0000"，相当于一个空位
int poster = cha.length-1;
while (num != 0)
{
int temp = num & 15;
//System.out.print(ch[temp]);
cha[poster--] = ch[temp];//往里面传输数据的时候，指针是在移动的
num = num >>> 4;
}
//遍历输出临时存储容器中的所存储的东西
//将数据从最后位输出
for (int x = poster;x <cha.length ;x++)
{
System.out.print(cha[x]+",");
}
System.out.println();
}
//查表法:步骤八
public static void toHex_8(int num)
{
char[] ch = {'0','1','2','3'
,'4','5','6','7'
,'8','9','A','B'
,'C','D','E','F'};
//定义一个临时容器
char[] cha = new char[8];//此默认初始化的值为："\u0000"，相当于一个空位
int poster = cha.length-1;
while (num != 0)
{
int temp = num & 15;
//System.out.print(ch[temp]);
cha[poster--] = ch[temp];//往里面传输数据的时候，指针是在移动的
num = num >>> 4;
}
//遍历输出临时存储容器中的所存储的东西
//将数据从最后位输出
for (int x = poster+1;x <cha.length ;x++)
{
System.out.print(cha[x]+",");
}
System.out.println();
}
//查表法:步骤九(最终版)
public static void toHex_9(int num)
{
char[] ch = {'0','1','2','3'
,'4','5','6','7'
,'8','9','A','B'
,'C','D','E','F'};
//定义一个临时容器
char[] cha = new char[8];//此默认初始化的值为："\u0000"，相当于一个空位
int poster = cha.length;
while (num != 0)
{
//取出有效位
int temp = num & 15;
//System.out.print(ch[temp]);
cha[--poster] = ch[temp];//往里面传输数据的时候，指针是在移动的
num = num >>> 4;
}
//遍历输出临时存储容器中的所存储的东西
//将数据从最后位输出
for (int x = poster;x <cha.length ;x++)
{
System.out.print(cha[x]+",");
}
System.out.println();
}
}