一，IO流-数据流

二，数据输出流

 

 三，案例

package BigDecimal;import java.io.DataOutputStream;
import java.io.FileOutputStream;public class DATaOutputStreamss {public static void main(String[] args)  {try ( //1,创建一个数据输出流包装低级的字节输出流DataOutputStream ds =new DataOutputStream(new FileOutputStream("untitled\\src\\BigDecimal\\Duxiaonanj.txt"));){ds.write(5);ds.writeDouble(99.5);ds.writeBoolean(true);} catch (Exception e) {e.printStackTrace();}}
}

四，数据输入流

五，案例

package BigDecimal;import java.io.DataInputStream;
import java.io.FileInputStream;public class DATaInputStreamss {public static void main(String[] args) {try( DataInputStream ds =new DataInputStream(new FileInputStream("C:\\untitled1\\untitled\\src\\BigDecimal\\Duxiaonanj.txt"));){int i =ds.readInt();System.out.println(i);double d =ds.readDouble();System.out.println(d);} catch (Exception e) {e.printStackTrace();}}
}