IO流（数据流

数据流

创建一个输入或者输出流只想底层的输入输出流

            File file1=new File("test1.txt");
            FileOutputStream out1=new FileOutputStream(file1);
            DataOutputStream out11=new DataOutputStream(out1);
            out11.writeInt(100);
            out11.writeLong(100);
            out11.writeFloat(3.14f);
            out11.writeDouble(3.14);
            out11.writeBoolean(true);
            out11.writeChars("hello world ");
            FileInputStream in1=new FileInputStream(file1);
            DataInputStream in11=new DataInputStream(in1);
            System.out.println(in11.readInt());
            System.out.println(in11.readLong());
            System.out.println(in11.readFloat());
            System.out.println(in11.readDouble());
            System.out.println(in11.readBoolean());
            char c;
            for(;(c=in11.readChar())!='';){
                System.out.print(c);
            }

对象流（克隆不改变原来引用

        try{
            File file1=new File("test1.txt");
            FileOutputStream out1=new FileOutputStream(file1);
            ObjectOutputStream out2=new ObjectOutputStream(out1);
            TV tv1=new TV();
            out2.writeObject(tv1);
            FileInputStream in1=new FileInputStream(file1);
            ObjectInputStream in2=new ObjectInputStream(in1);
            TV tv2=(TV)in2.readObject();
            tv2.show();
        }
        catch(IOException e){
            System.out.println(e.toString());
        }
        catch(ClassNotFoundException e2){//一定要写
            System.out.println(e2.toString());
        }