int、char、double与byte互相转换

int、char、double与byte相互转换
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) {
????inttemp = number;
????byte[]b=new byte[4];
????for(int i=b.length-1;i>-1;i--){
??????b[i]= newInteger(temp&0xff).byteValue();??????//将最高位保存在最低位
??????temp= temp >>8;??????//向右移8位
????}
????returnb;
??}

??//字节数组到整数的转换
??public static intbyteToInt(byte[] b) {
????ints = 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)??????//最后一个之所以不乘，是因为可能会溢出
??????s= s + b[3];
????else
??????s= s + 256 + b[3];
????returns;
??}

??//字符到字节转换
??public static byte[]charToByte(char ch){
????inttemp=(int)ch;
????byte[]b=new byte[2];
????for(int i=b.length-1;i>-1;i--){
??????b[i]= newInteger(temp&0xff).byteValue();??????//将最高位保存在最低位
??????temp= temp >>8;??????//向右移8位
????}
????returnb;
??}

??//字节到字符转换


??public static charbyteToChar(byte[] b){
????ints=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];
????charch=(char)s;
????returnch;
??}

??//浮点到字节转换
??public static byte[]doubleToByte(double d){
????byte[]b=new byte[8];
????longl=Double.doubleToLongBits(d);
????for(inti=0;i<b.length;i++){
??????b[i]=newLong(l).byteValue();
??????l=l>>8;


????}
????returnb;
??}

??//字节到浮点转换
??public static doublebyteToDouble(byte[] b){
????longl;

????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);
????returnDouble.longBitsToDouble(l);
??}

BigInteger int1 = BigInteger.valueOf(360).toByteArray();
int m = new BigInteger(byte[]).intValue();