问题描述

Java二维数组存储一位数组的问题

从一个txt文件中读出字符串，每一行输出一个record，但我想把所有record中的字符串存放到一个字符数组中，便于我下一步单个字符分析，该怎么改啊

 import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;

class test2 {
    public static void main(String[] args) {
        test2 t = new test2();
        t.readMyFile();
    }

    void readMyFile() {
        String record;
        int recCount = 0;
        char[] a;
        char[][] b=new char[10][];
        int i=0;
        int j=0;
        try {
            FileReader fr = new FileReader("D:\data.txt");
            BufferedReader br = new BufferedReader(fr);
            while ((record = br.readLine()) != null) {
                recCount++;
                a=record.toCharArray();
                System.out.println(recCount + ": " + record);
                System.out.println(a[j]);
                for(;j<a.length;j++)
                {
                    b[i][j]=a[j];
                }
                i++;
                //System.out.println(b[i][j]);
            }
            br.close();
            fr.close();
        } catch (IOException e) {
            System.out.println("Uh oh, got an IOException error!");
            e.printStackTrace();
        }
    }

}

解决方案

b的第二维要先初始化，建议使用List<String>，如果你不能确定长度的话。

解决方案二：

http://blog.sina.com.cn/s/blog_6e10627f0100n0ba.html

解决方案三：

 public class test2 {
    public static void main(String[] args) {
        test2 t = new test2();
        t.readMyFile();
    }

    void readMyFile() {
        String record;
        ArrayList<char[]> charLists = new ArrayList();//变成这样
        char[] a;
        try {
            FileReader fr = new FileReader("D:\data.txt");
            BufferedReader br = new BufferedReader(fr);
            while ((record = br.readLine()) != null) {
                a=record.toCharArray();
                charLists.add(a);
            }
            br.close();
            fr.close();
        } catch (IOException e) {
            System.out.println("Uh oh, got an IOException error!");
            e.printStackTrace();
        }
    }

}

解决方案四：

用集合吧，把数据放进集合里面再遍历，跟数组差不多

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;

class test2 {
public static void main(String[] args) {
test2 t = new test2();
t.readMyFile();
}

void readMyFile() {
    String record="";
    List<String> lists = new ArrayList<String>();
    int i=0;
    int j=0;
    try {
        FileReader fr = new FileReader("D:\data.txt");
        BufferedReader br = new BufferedReader(fr);
        while ((record = br.readLine()) != null) {
           lists.add(record);
                        record="";
        }
        br.close();
        fr.close();
    } catch (IOException e) {
        System.out.println("Uh oh, got an IOException error!");
        e.printStackTrace();
    }
}

}