存储二维数组（串）文件，并检索 [英] Store 2D array (String) to file and retrieve it
问题描述
我已经有一个二维字符串数组存储大量数据的简单程序。我搜索了很多有关如何存储和检索二维数组的地方。我想保存在我的数组中的数据在节目的结束，并具有该数据经节目的开始检索。我努力了：
ObjectOutputStream的TOFILE =新的ObjectOutputStream（新的FileWriter（array.DATA））;
toFile.writeObject（阵列）; 这想出了错误：不兼容的类型：FileWriter的不能转换到的OutputStream
I have made a simple program that has a 2D String array storing lots of data. I have searched a lot of places for how to store and retrieve 2D arrays. I want to save the data in my array at the end of the program and have this data retrieved upon the start of the program. I have tried:
ObjectOutputStream toFile = new ObjectOutputStream(new FileWriter("array.DATA"));
toFile.writeObject(array); This came up with the error: incompatible types: FileWriter cannot be converted to OutputStream
我只知道基本的编程，以便尽量容易对我解释一下你说的彻底的一切。如果我说实话，我甚至不知道发生了什么的ObjectOutputStream'的。
I only know basic programming so try to be easy on me and explain everything you say thoroughly. If I'm honest I don't even know what 'ObjectOutputStream' is.
在预先感谢
推荐答案
在这个例子： 这个例子很简单（它不是一个完美的解决方案，但它是一个良好的开端undestand如何保存和检索的作品）。
In this example: This example is very simple(it's not a perfect solution but it's a good start to undestand how save and retrieve works).
您二维数组为int a [] [] =新的INT [12] [12];
Your 2d array is int a[][]= new int[12][12];
//或者是一个字符串[] [] =新的String [12] [12];
//or a is String a[][] = new String[12][12];
-
第1部分：（保存）
Part 1: (Save)
public void Save(){
try {
PrintWriter writer = new PrintWriter(new File("C:/Users/Alex.hp/Desktop/t.txt"));
for(int i=0; i<a.length; i++){
for(int j=0; j<a[i].length; j++){
//use this if your array has (int,double..)
// writer.write(String.valueOf(a[i][j])+" "); //Here you parse the int from array to String.
//use this if your array has String
writer.write(a[i][j]+" "); //Its String so you dont have to use String.valueOf(something(int,double,...)
}
writer.println(); //leave one line
}
writer.flush(); //flush the writer
writer.close(); //close the writer
} catch (FileNotFoundException e) {
e.printStackTrace();
}
} //方法结束
}//end of method
使用一个简单的PrintWriter您保存数组到一个文件exaclty是怎么回事。 只要你知道改变我已经把该文件的路径; 的
-
第2部分：（更新或检索上打开）
Part 2: (Update or Retrieve on Open)
public void UpdateOnOpen(){
try {
Scanner scan = new Scanner(new File("C:/Users/Alex.hp/Desktop/t.txt"));
//Retrieve
for(int i=0; i<a.length; i++)
for(int j=0; j<a[i].length; j++){
//if you array use (int,double,...)
//a[i][j]=Interger.parseInt(scan.next()) //for int
//a[i][j]=Double.parseDouble(scan.next()) //for double
//if your array use String
a[i][j]=scan.next(); //Here you retrieve the array again from the file
}//end of for(int j=0; j<a[i].length; j++)
scan.close(); //close the resource file you opened
//Print it to be sure all are right
for(int i=0; i<a.length; i++){
for(int c=0; c<a[i].length; c++)
System.out.printf(""+a[i][c]+",");
System.out.println();
}
} catch (FileNotFoundException e){ e.printStackTrace(); }
}//end of method
使用扫描仪类检索您的阵列从已保存的文件恢复。
Also a better solution but you have to dig more here
让我知道你的任务完成了。
Let me know it your job is done..
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