How to understand data flow, object flow, and print stream in a stream

This article introduces how to understand the data flow, object flow and print flow in the stream. The content is very detailed. Interested friends can use it for reference. I hope it will be helpful to you.

Data flow: DataOutputStream

Public class TestDataStream {public void writeData () {double [] arrays = new double [1000]; Arrays.fill (arrays, Math.PI); String fileName = "F:/java/test2.txt"; FileOutputStream out; DataOutputStream dos = null; try {out = new FileOutputStream (fileName); dos = new DataOutputStream (out) For (int I = 0; I

< arrays.length; i++) { dos.writeDouble(arrays[i]); } // dos.write(123); // dos.writeBoolean(true); // dos.writeChar('Z'); // dos.writeDouble(Math.PI); dos.flush(); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } finally { if (dos != null) { try { dos.close(); } catch (IOException e) { e.printStackTrace(); } } } } public static void main(String[] args) { TestDataStream tds = new TestDataStream(); tds.writeData(); } } 数据流:DataInputStream public class TestDataInputStream { public static void main(String[] args) { String fileName = "F:/java/test2.txt"; FileInputStream in = null; DataInputStream dis = null; try { in = new FileInputStream(fileName); dis = new DataInputStream(in); for (int i = 0; i < 1000; i++) { System.out.println(dis.readDouble() + "i: " + i); } // System.out.println(dis.read()); // System.out.println(dis.readBoolean()); // System.out.println(dis.readChar()); // System.out.println(dis.readDouble()); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } finally { if (dis != null) { try { dis.close(); } catch (IOException e) { e.printStackTrace(); } } } } } 对象流：ObjectOutputStream（unserializable）、ObjectInputStream（serializable） public class TestSerializable { public static void main(String[] args) { TestSerializable ts = new TestSerializable(); ts.serializable(); ts.unserializable(); } public void serializable()//序列化，写入 { String filename = "F:/java/stu.txt"; Student s1 = new Student("haoyouduo",1987); FileOutputStream fis =null; ObjectOutputStream ois = null; try { fis = new FileOutputStream(filename); ois = new ObjectOutputStream(fis); ois.writeObject(s1); ois.flush(); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } finally { if(null != ois) { try { ois.close(); } catch (IOException e) { e.printStackTrace(); } } } } public void unserializable()//反序列化，读取 { String filename = "F:/java/stu.txt"; FileInputStream fis = null; ObjectInputStream ois = null; try { fis = new FileInputStream(filename); ois = new ObjectInputStream(fis); Student s = (Student)ois.readObject(); System.out.println(s); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } catch (ClassNotFoundException e) { e.printStackTrace(); } finally { if(ois != null) { try { ois.close(); } catch (IOException e) { e.printStackTrace(); } } } } } class Student implements Serializable//对象类必须实现可序列化的 { String name; int age; public Student(String name,int age) { this.name = name; this.age = age; } @Override public String toString() { return "Student [name=" + name + ", age=" + age + "]"; } } 打印流:PrintStream public class Test { public static void main(String[] args) { boolean flag = 2 >

1; if (flag) {System.out.println ("sss");} else {System.out.println ("aaa");} System.out.println ("before using printStream") / * the contents of the above part will be printed in the console * the contents of the lower part will not be printed in the console, but in the file * / String filename = "f:/java/log.txt"; FileOutputStream fos; PrintStream ps = null; try {fos = new FileOutputStream (filename) Ps = new PrintStream (fos); System.setOut (ps); System.out.println ("this will be printed in the file"); System.out.println ("after using printStream");} catch (FileNotFoundException e) {e.printStackTrace () } finally {if (ps! = null) {ps.close ();} on how to understand the data flow, object flow and print flow in the flow is shared here. I hope the above can be helpful and learn more. If you think the article is good, you can share it for more people to see.