如何将基本信息转化为对象存储起来以备后用

Question

我使用下面的代码创建了一个名为 Test.txt 的 .txt 文件并且它有效。现在我希望 java 将信息读回给我，当我这样做时，我在代码的两个段落之间收到错误。我只是想写入一个文件，保存它，并能够读取它，这样我就可以创建一个小型数据库。谢谢！

package textFile;
import java.io.*;
import java.lang.*;
import java.util.*;

public class createFile {

private Formatter x;

public void openfile(){
    try{
        x = new Formatter("Test.txt");

    }
    catch(Exception e) {
        System.out.println("you have and error");
    }
}


public void addRecords(){
    x.format("%s%s%s", "Coty", "xcallidus", "Password");
}
public void closefile(){
    x.close();
}
}

Exception in thread "main" java.util.NoSuchElementException
at java.util.Scanner.throwFor(Scanner.java:907)
at java.util.Scanner.next(Scanner.java:1416)
at readToMe.read.readFile(read.java:21)
at readToMe.Main.main(Main.java:11)

package readToMe;
import java.lang.*;
import java.io.*;
import java.util.*;
public class read {


    private Scanner x;

    public void openFile(){
        try{
            x = new Scanner(new File("Test.txt"));
        }
        catch(Exception e){
            System.out.println("Could not find file");
        }
    }
        public void readFile(){
            while(x.hasNext()){
                String a = x.next();
                String b = x.next();
                String c = x.next();

                System.out.printf("%s %s %s", a,b,c);
            }
        }
        public void closeFile(){
            x.close();


    }
}

Answer 1

问题出在

public void addRecords(){
    x.format("%s%s%s", "Coty", "xcallidus", "Password");
//This creates CotyxcallidusPassword - Without spaces
}

您正在添加三个不带空格的字符串，并试图读取带空格的字符串。应该是

public void addRecords(){
    x.format("%s %s %s", "Coty", "xcallidus", "Password");
}

如何将基本信息转化为对象存储起来以备后用

How to turn basic information into and object to store for later use

java

java.util.scanner

nosuchelementexception