英文:
How do I access my text file from other methods if it is passed as a command line argument in the main method(java)
问题
以下是翻译好的代码部分：
public class Practice {
public static void main(String[] args) throws FileNotFoundException {
In in = new In(args[0]); // 定义局部变量
abc(in); // 将其传递给方法
}
public static void abc(In in) throws FileNotFoundException {
String s = in.readAll(); // 使用方法参数
double[][] boxes = readFile(s);
System.out.println(boxes);
}
public static double[][] readFile(String s) throws FileNotFoundException {
File f = new File(s);
Scanner scF = new Scanner(f);
int R = scF.nextInt();
int C = scF.nextInt();
double[][] boxes = new double[R][C];
while (scF.hasNextLine()) {
for (int i = 0; i < R; i++) {
for (int j = 0; j < C; j++) {
boxes[i][j] = scF.nextInt();
} // 读取文件并将值添加到 double[][] 数组中
}
}
return boxes;
// 返回一个 double[][] 数组
}
}
如果有任何问题需要进一步解答，请随时提问。
英文:
I am new to using multiple methods in Java so I am struggling quite a bit with this. I am using the stdIn library and the location of the text file is passed as a command line argument in the main method as follows: In in = new In(args[0]);.
How do I read this file from another method and what method do I use? I am not quite sure how to access it from other methods as it keeps saying variables of type "In" are not allowed.
this is the code I have done so far
public class Practice {
public static void main(String[] args) throws FileNotFoundException {
In in = new In(args[0]); // define the local variable
abc(in); // pass it to the method
}
public static void abc(In in) throws FileNotFoundException {
String s = in.readAll(); // use the method parameter
double[][] boxes = readFile(s);
System.out.println(boxes);
}
public static double[][] readFile(String s) throws FileNotFoundException {
File f = new File(s);
Scanner scF = new Scanner(f);
int R = scF.nextInt();
int C = scF.nextInt();
double[][] boxes = new double[R][C];
while (scF.hasNextLine()) {
for (int i = 0; i < R; i++) {
for (int j = 0; j < C; j++) {
boxes[i][j] = scF.nextInt();
} //reads file and adds values to a double[][] array
}
}
return boxes;
//returns a double[][] array
}
}
Any help will be greatly appreciated!
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