Java温故而知新-RandomAccessFile

文件组成

RandomAccessFile常用方法

范例：实现随机写入

package com.itkey.javareview.温故知新.io;

import lombok.SneakyThrows;

import java.io.File;
import java.io.RandomAccessFile;
import java.nio.charset.StandardCharsets;

public class RandomAccessFileDemo {
    public static final int MAX_LENGTH =8;

    @SneakyThrows
    public static void main(String[] args) {
        File file = new File("/Users/itkey/Documents/GitHub/java-review/src/main/java/com/itkey/javareview/温故知新/io" + File.separator + "yootk.data");
        if(!file.getParentFile().exists()){
            file.getParentFile().mkdirs();
        }
        RandomAccessFile raf = new RandomAccessFile(file,"rw");

        String names[] = new String[] {"zhangsan","lisi","wangwu","zhaoliu","sunqi"};
        int ages[] = new int[] {12,13,17,16,15};
        int i = 0;
        for (String name : names) {
            name =  addSpace(name);
            raf.write(name.getBytes(StandardCharsets.UTF_8));
            raf.writeInt(ages[i]);
            i++;
        }
        raf.close();
    }

    /**
     * 字符过短，补空格
     * @param str
     * @return
     */
    public static String addSpace(String str){
        StringBuffer stringBuffer = new StringBuffer(str);
        while (stringBuffer.length()