数据过滤流 import java.io.*;import java.util.*;class datainput_output{ public static void main(String args[])throws IOException{  FileOutputStream fos=new FileOutputStream("aa.txt");  DataOutputStream dos=new DataOutputStream(fos);  try{   dos.writeBoolean(true);   dos.writeByte((byte)123);   dos.writeChar('j');   dos.writeBoolean(true);  }  finally{   dos.close();  }    FileInputStream fin=new FileInputStream("aa.txt");  DataInputStream sin=new DataInputStream(fin);  try{     System.out.println(sin.readBoolean());   System.out.println(sin.readByte());   System.out.println(sin.readChar());   System.out.println(sin.readBoolean());  }   finally{   sin.close();  } } } //当前目录下创建aa.txt,绝对目录记得把\改成/,不然就老提示illegal escape character 对象流 import java.io.Serializable;public class Student implements Serializable{ int id; String name; int age; String department; public Student(int id,String name,int age,String department){  this.id=id;  this.name=name;  this.age=age;  this.department=department; } void show(){  System.out.println(id+","+name+","+age+","+department); }}//可以串行化的对象 import java.io.*;class ObjectSeriWrite{ public static void main(String args[]){  Student stu1=new Student(200501,"li ming",16,"compute science");  Student stu2=new Student(200502,"zhang bi",17,"chineses");  try{   FileOutputStream fo=new FileOutputStream("student.dat");   ObjectOutputStream so=new ObjectOutputStream(fo);      so.writeObject(stu1);   so.writeObject(stu2);   so.close();      FileInputStream fi=new FileInputStream("student.dat");   ObjectInputStream si=new ObjectInputStream(fi);   stu1=(Student)si.readObject();   stu2=(Student)si.readObject();      si.close();   stu1.show();   stu2.show();  }  catch(Exception e){   System.out.println(e);  } }} /*他创建了个bat文件,用记事本打开全是  sr Student?Rt鮱 I ageI idL departmentt Ljava/lang/String;L nameq ~
xp    5t compute sciencet li mingsq ~      6t chinesest zhang bi 但是要记得静态的东西保留不了*/

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