轉(zhuǎn)載
http://www.matrix.org.cn/thread.shtml?forum_id=19&view_id=919int、char、double與byte相互轉(zhuǎn)換的程序
//整數(shù)到字節(jié)數(shù)組的轉(zhuǎn)換
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(); //將最高位保存在最低位
temp = temp >> 8; //向右移8位
}
return b;
}
//字節(jié)數(shù)組到整數(shù)的轉(zhuǎn)換
public static int byteToInt(byte[] b) {
int s = 0;
for (int i = 0; i < 3; i++) {
if (b[i] >= 0)
s = s + b[i];
else
s = s + 256 + b[i];
s = s * 256;
}
if (b[3] >= 0) //最后一個之所以不乘，是因為可能會溢出
s = s + b[3];
else
s = s + 256 + b[3];
return s;
}
//字符到字節(jié)轉(zhuǎn)換
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(); //將最高位保存在最低位
temp = temp >> 8; //向右移8位
}
return b;
}
//字節(jié)到字符轉(zhuǎn)換
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;
}
//浮點到字節(jié)轉(zhuǎn)換
public static byte[] doubleToByte(double d){
byte[] b=new byte[8];
long l=Double.doubleToLongBits(d);
for(int i=0;i<b.length;i++){
b[i]=new Long(l).byteValue();
l=l>>8;
}
return b;
}
//字節(jié)到浮點轉(zhuǎn)換
public static double byteToDouble(byte[] b){
long l;
l=b[0];
l&=0xff;
l|=((long)b[1]<<8);
l&=0xffff;
l|=((long)b[2]<<16);
l&=0xffffff;
l|=((long)b[3]<<24);
l&=0xffffffffl;
l|=((long)b[4]<<32);
l&=0xffffffffffl;
l|=((long)b[5]<<40);
l&=0xffffffffffffl;
l|=((long)b[6]<<48);
l|=((long)b[7]<<56);
return Double.longBitsToDouble(l);
}
--