将参数带入java输入输出方法

Question

我正在尝试将来自不同方法的 2 个数组和一个整数带入写入文件的方法中。我尝试使用参数引入，但它不起作用。希望能帮到你

这就是我从保存数组信息的方法传递参数的方式。

write (NameX, ScoresArray, players); /

该方法旨在使用传递的数组参数来创建文件。

public static void write (String NameX [], int ScoresArray [], int players ) throws IOException 
{
    PrintWriter outputStream = new PrintWriter(new FileWriter("Genius.txt"));


    outputStream.println(players);

    for (int i = 0; i < NameX.length; i++)
    {
            outputStream.println(NameX[i] + ScoresArray [i] );
    }

    outputStream.close();



}

这是读取文件的方法

public static void reads () throws IOException 
{
    BufferedReader inStream = new BufferedReader(new FileReader("Genius.txt"));

    // Read in first file entry as an integer - the number of names stored       
    int players = Integer.parseInt(inStream.readLine());
    System.out.println(players);

    // Create an array big enough
    String [] NameX = new String[players];
    String [] ScoresArray = new String[players];

    // Now read in the names
    for (int i = 0; i < NameX.length; i++)
    {
        NameX[i] = inStream.readLine();
        ScoresArray[i] = inStream.readLine();

        System.out.println(NameX[i]);
        System.out.println(ScoresArray[i]);
    }

    inStream.close();



}

请您告诉我哪里出了问题以及如何创建一个文件来保存数组并稍后读取文件。

******************修改后的代码********************

    write(NameX,ScoresArray,players);
   reads();
    }


}//end of league table


public static void write (String NameX [], int ScoresArray [], int players ) throws IOException 

{

PrintWriter outputStream = new PrintWriter(new FileWriter("Genius.txt"));


outputStream.println(players);

for (int i = 0; i < NameX.length; i++)
{
        outputStream.println(NameX[i] +":"+ ScoresArray [i] );
}

outputStream.close();

} public static void reads() 抛出 IOException { BufferedReader inStream = new BufferedReader(new FileReader("Genius.txt"));

// Read in first file entry as an integer - the number of names stored       
int players = Integer.parseInt(inStream.readLine());
System.out.println(players);

// Create an array big enough
String [] NameX = new String[players];
String [] ScoresArray = new String[players];

// Now read in the names
for (int i = 0; i < NameX.length; i++)
{
    String str = inStream.readLine();
    String vals[] = str.split(":");
    System.out.println(vals[0]+"   "+vals[1]);
}

inStream.close();

}

我仍然遇到同样的问题

Answer 1

IOException 是一个检查异常，你的函数write (NameX, ScoresArray, players); 是抛出IOException。 所以你应该在调用者中处理它。

try {
   write (NameX, ScoresArray, players); //
}catch(IOException ie){
  // do operation 
}

更多详情请见：Lesson: Exceptions

Answer 2

好吧，我希望你正在寻找这个：

/*
 * 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 test;

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

/**
 *
 * @author manoj.sharma
 */
public class Test {

    /**
     * @param args the command line arguments
     */

    public static void write (String NameX [], int ScoresArray [], int players ) throws IOException 
{
    PrintWriter outputStream = new PrintWriter(new FileWriter("Genius.txt"));


    outputStream.println(players);

    for (int i = 0; i < NameX.length; i++)
    {
            outputStream.println(NameX[i] +":"+ ScoresArray [i] );
    }

    outputStream.close();



}
  public static void reads () throws IOException 
{
    BufferedReader inStream = new BufferedReader(new FileReader("Genius.txt"));

    // Read in first file entry as an integer - the number of names stored       
    int players = Integer.parseInt(inStream.readLine());
    System.out.println(players);

    // Create an array big enough
    String [] NameX = new String[players];
    String [] ScoresArray = new String[players];

    // Now read in the names
    for (int i = 0; i < NameX.length; i++)
    {
        String str = inStream.readLine();
        String vals[] = str.split(":");
        System.out.println(vals[0]+"   "+vals[1]);
    }

    inStream.close();



}  
    public static void main(String[] args) {
        String [] names={"manoj","kushal"};
        int [] scores = {10,20};
        int p = 2;
       try{
       write(names,scores,p);
       reads();
      } catch(IOException e){System.out.println(e.getMessage());}

    }

}

我希望你已经找到了解决方案。

Answer 3

也许你可以尝试使用 java.lang.Exception 而不是 IOException，使用 Exception 应该涵盖所有可能抛出的异常类型。

public static void write (String NameX [], int ScoresArray [], int players ) throws Exception
{
    PrintWriter outputStream = new PrintWriter(new FileWriter("Genius.txt"));
    outputStream.println(players);

    for (int i = 0; i < NameX.length; i++){
        outputStream.println(NameX[i] + ScoresArray [i] );
    }

    outputStream.close();
}

然后使用：

try {
   write (NameX, ScoresArray, players); //
}catch(IOException io){
    //Handle an IO exception
}catch(Exception e){
    //Handle Exception
}

恐怕我还没来得及测试这个。