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代码如下:
public class CommonUtils {
//高位在前,低位在后
public static byte[] int2bytes(int num){
byte[] result = new byte[4];
result[0] = (byte)((num >>> 24) & 0xff);//说明一
result[1] = (byte)((num >>> 16)& 0xff );
result[2] = (byte)((num >>> 8) & 0xff );
result[3] = (byte)((num >>> 0) & 0xff );
return result;
}
//高位在前,低位在后
public static int bytes2int(byte[] bytes){
int result = 0;
if(bytes.length == 4){
int a = (bytes[0] & 0xff) << 24;//说明二
int b = (bytes[1] & 0xff) << 16;
int c = (bytes[2] & 0xff) << 8;
int d = (bytes[3] & 0xff);
result = a | b | c | d;
}
return result;
}
public static void main(String[] args){
int a = -64;
System.out.println("-64="+Integer.toBinaryString(-64));
byte[] bytes = CommonUtils.int2bytes(a);
for(int i = 0 ; i<4 ; i++){
System.out.println(bytes[i]);
}
a = CommonUtils.bytes2int(bytes);
System.out.println(a);
}
}