JAVA_RandomAccess类操作

package com.kk.review;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.RandomAccessFile;

public class RandomAcessFileTest {
    public static void main(String[] args) {
        try {
            RandomAccessFile file=new RandomAccessFile("a.txt","rw"); //rw:读写
            Student kk=new Student("kk",'男',22);
            kk.write(file);
            file.seek(0);//将指定位到文件开始位置
            kk.read(file);
            kk.toString();
            file.seek(0);
            kk.readByPointer(file);//根据filePointer遍历文件模式
            file.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

class Student {
    String name;

    char gender;

    int age;

    public Student() {
    }

    void write(RandomAccessFile file) throws IOException {
        file.writeUTF(this.getName());
        file.writeChar(this.getGender());
        file.writeInt(this.getAge());
    }

    void read(RandomAccessFile file) throws IOException {
        this.setName(file.readUTF());
        this.setGender(file.readChar());
        this.setAge(file.readInt());
    }
    
    /**
     * 根据file.getFilePointer循环读取
     * @param file
     * @throws IOException
     */
    void readByPointer(RandomAccessFile file)throws IOException{
        for (long i = 0; i < file.length(); i=file.getFilePointer()) {
            System.out.println(file.readUTF());
            System.out.println(file.readChar());
            System.out.println(file.readInt());
        }
    }

    @Override
    public String toString() {
        System.out.println("name:".concat(getName()).concat("\rgender:")
                .concat(getGender() + "\r").concat("age:").concat(
                        getAge() + "\r"));
        return null;
    }

    public Student(String name, char gender, int age) {
        this.name = name;
        this.gender = gender;
        this.age = age;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public char getGender() {
        return gender;
    }

    public void setGender(char gender) {
        this.gender = gender;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

}