如何使用bufferedreader接受java中的字符串数组

Question

public static void accept_name( String[] name, int[] r)
{

   InputStreamReader isr = new InputStreamReader(System.in);
   BufferedReader ab = new BufferedReader(isr);
    r = new int[40];
    name = new String[40];
    for(int i=0;i<40;i++)
    {
        System.out.println("Enter the name of students");
        name[i] = ab.readLine();
    }             
}

i am having a problem in name[i] = ab.readLine();

i don't understand what the problem is.

Answer 1

Actually,If you mouseover on the error line ,the message there tells everything.

It's a compile time error.Asking for exception handling.While executing that line there are chances to get the IOException .

So you have to handle it by throwing in the method signature or by catching it there itself.

Change your method to

public static void accept_name( String[] name, int[] r)
    {

       InputStreamReader isr = new InputStreamReader(System.in);
       BufferedReader ab = new BufferedReader(isr);
        r = new int[40];
        name = new String[40];
        for(int i=0;i<40;i++)
        {
            System.out.println("Enter the name of students");
            try {
                name[i] = ab.readLine();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }             
    }

Heavily recommending concept

Answer 2

You are getting name array in the function argument why are you initializing it again? Below is not required

name = new String[40];
r = new int[40];

You code must be

public static void accept_name( String[] name, int[] r)
{

   InputStreamReader isr = new InputStreamReader(System.in);
   BufferedReader ab = new BufferedReader(isr);
    for(int i=0;i<40;i++)
    {
        System.out.println("Enter the name of students");
        try {
            name[i] = ab.readLine();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }             
}

and then you can call your function as

String[] name = new String[40];
//populate your name array
int[] r = new int[40];
//populate your r array
ClassName.accept_name(name,r);//Static function

also I don't see where you are using r.

Answer 3

Readline throws an IOException so you should catch it or rethrow.

public static void accept_name(String[] name, int[] r) throws IOException {
 [...]
}

Carlo

Answer 4

When using Input\\Output stream, an IOException is expected, define that it might throw that kind of exception:

public static void accept_name (String[] name, int[] r) throws IOException
{
   InputStreamReader isr = new InputStreamReader(System.in);
   BufferedReader ab = new BufferedReader(isr);

    r = new int[40];
    name = new String[40];

    for(int i=0;i<40;i++)
    {
        System.out.println("Enter the name of students");
        name[i] = ab.readLine();
    }             
}

Answer 5

You could try this...

    public static void accept_name( String[] name, int[] r)
    {

       name = new String[40];
       for(int i=0;i<40;i++)
       {
            try {
                  InputStreamReader isr = new InputStreamReader(System.in);
                  BufferedReader ab = new BufferedReader(isr);
                  System.out.println("Enter the name of students");
                  name[i] = ab.readLine();
                  ab.close();
            } catch (IOException e) {
                  e.printStackTrace();
            }
       }             
    }