int、char、double与byte相互转换的程序
//整数到字节数组的转换
public static byte[] intToByte(int number) {
int temp = number;
byte[] b=new byte[4];
for (int i=b.length-1;i-1;i--){
b[i] = new Integer(temp&0xff).bytevalue();//将最高位保存在最低位
temp = temp 8; //向右移8位
}
return b;
}
//字节数组到整数的转换
public static int byteToInt(byte[] b) {
int s = 0;
for (int i = 0; i
if (b[i] = 0)
s = s + b[i];
else
s = s + 256 + b[i];
s = s * 256;
}
if (b[3] = 0) //最后一个之所以不乘，是因为可能会溢出
s = s + b[3];
else
s = s + 256 + b[3];
return s;
}
//字符到字节转换
public static byte[] charToByte(char ch){
int temp=(int)ch;
byte[] b=new byte[2];
for (int i=b.length-1;i-1;i--){
b[i] = new Integer(temp&0xff).bytevalue();//将最高位保存在最低位
temp = temp 8; //向右移8位
}
return b;
}
//字节到字符转换
public static char byteToChar(byte[] b){
int s=0;
if(b[0]0)
s+=b[0];
else
s+=256+b[0];
s*=256;
if(b[1]0)
s+=b[1];
else
s+=256+b[1];
char ch=(char)s;
return ch;
}
//浮点到字节转换
public static byte[] doubleToByte(double d){
byte[] b=new byte[8];
long l=Double.doubleToLongBits(d);
for(int i=0;i
b[i]=new Long(l).bytevalue();
l=l8;
}
return b;
}
//字节到浮点转换
public static double byteToDouble(byte[] b){
long l;
l=b[0];
l&=0xff;
l=((long)b[1]
l&=0xffff;
l=((long)b[2]
l&=0xffffff;
l=((long)b[3]
l&=0xffffffffl;
l=((long)b[4]
l&=0xffffffffffl;
l=((long)b[5]
l&=0xffffffffffffl;
l=((long)b[6]
l=((long)b[7]
return Double.longBitsToDouble(l);
}
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