为啥int强转

public static byte[] int2Byte(int x){
byte[] bs=new byte[4];
bs[0]=(byte) ((int)(x>>0*8)&0xff);
bs[1]=(byte) (((int)x>>1*8)&0xff);
bs[2]=(byte) (((int)x>>2*8)&0xff);
bs[3]=(byte) (((int)x>>3*8)&0xff);
return bs;
}
这里为什么要（int）强转