將字符串分成兩個單獨的部分

Question

好吧，我的意思是，我創建了一個String類型的變量，然后在加載文件時，我必須將內容保存在一個變量中，在這種情況下，該變量是“ TextFromFile”，加載后，我想將其分為兩個一個並保存在數組中，之后我只想在屏幕上顯示兩個單獨的字符串。 那是個主意。

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package zadania1;

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;

public class Zadania1 
{
    public static void main(String[] args) 
    {
        String TextFromFile = "";
        Zadania1 zad = new Zadania1(); 
        TextFromFile = zad.NacitajObsahZoSubora("C:\\Users\\Ivan\\Desktop\\test.txt");
        String[] pole = TextFromFile.split("[ \\ ]");
        System.out.println("Frist matrica " + pole[0] +" Second matrica: " + pole[1] +"");
    }

    public String NacitajObsahZoSubora(String fileName)
    {
        String text = "", tmp;
        try 
        {
            FileInputStream file = new FileInputStream(fileName);
            InputStreamReader input = new InputStreamReader(file);
            try (BufferedReader fromFile = new BufferedReader(input)) 
            {
                while((tmp = fromFile.readLine()) != null)
                {
                    text = text + "\n" + tmp;
                }
                System.out.println("Obsah suboru:\n" + text);
            }
        }
        catch(IOException e)
        {            
        }
        return text;
    }

    public void ZapisObsahDoSubora(String fileName, String writeText)
    {
        try
        {
            FileOutputStream file = new FileOutputStream(fileName);
            OutputStreamWriter output = new OutputStreamWriter(file);
            try (PrintWriter toFile = new PrintWriter(output)) 
            {
                toFile.println("" + writeText);
            }
        }
        catch (IOException e)
        {   
        }
    }
}

只有這一部分向我展示數組超出了反彈范圍：

String[] pole = TextFromFile.split("[ \\ ]");
        System.out.println("Frist matrica " + pole[0] +" Second matrica: " + pole[1] +"");

錯誤：

線程“主”中的異常java.lang.ArrayIndexOutOfBoundsException：zadania1.Zadania1.main（Zadania1.java:24）為1

Answer 1

根據我從評論中了解的內容，假設您的輸入形式為：

[1,2,3;4,5,6;][9,8;7,-6;50,61;]

您需要在拆分中使用另一個正則表達式，這涉及到一個回顧：

String input = "[1,2,3;4,5,6;][9,8;7,-6;50,61;]";
String[] pole = input.split("(?<=\\])");
System.out.println("Frist matrica " + pole[0] +" Second matrica: " + pole[1] +"");

// Output:
// Frist matrica [1,2,3;4,5,6;] Second matrica: [9,8;7,-6;50,61;]