import java.nio.ByteBuffer;
public class Test {
public static void main(String[] args) {
byte[] b = int2byteArray(130);
for (int i = 0; i < b.length; i++) {
byte c = b[i];
System.out.println("byte["+i+"] ==>"+c);
}
//int 转byte
System.out.println((byte)130);
//int 转byte[]
ByteBuffer buffer = ByteBuffer.allocate(4);
buffer.putInt(130);
byte[] b1= buffer.array();
for (int i = 0; i < b1.length; i++) {
byte c = b[i];
System.out.println("byte["+i+"] ==>"+c);
}
//byte[] 转Int
ByteBuffer byteBuffer1 = ByteBuffer.wrap(new byte[]{0,0,0,1});
System.out.println(byteBuffer1.getInt());
}
/**
* int值转成4字节的byte数组
*
* @param num
* @return
*/
public static byte[] int2byteArray(int num) {
byte[] result = new byte[4];
result[0] = (byte) (num >>> 24);// 取最高8位放到0下标
result[1] = (byte) (num >>> 16);// 取次高8为放到1下标
result[2] = (byte) (num >>> 8); // 取次低8位放到2下标
result[3] = (byte) (num); // 取最低8位放到3下标
return result;
}
}相关推荐
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