help with methods [closed]

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I think my program should run, I'm just blanking on how to call these methods so it will work. Here's the code:

import java.util.*;
public class median {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub

        // need to call methods

    }
    int[] arr;
    int m;
    public void selectio开发者_开发知识库nSort() {
        Scanner input = new Scanner( System.in );
        System.out.println("how many numbers in array: ");
         m = input.nextInt();
        System.out.println("enter"+m+" numbers: ");
        int count=0;
        while(count <m){
            int num = input.nextInt();
            arr[count]=num;
        }

          int i, j, minIndex, tmp;
          int n = arr.length;
          for (i = 0; i < n - 1; i++) {
                minIndex = i;
                for (j = i + 1; j < n; j++)
                      if (arr[j] < arr[minIndex])
                            minIndex = j;
                if (minIndex != i) {
                      tmp = arr[i];
                      arr[i] = arr[minIndex];
                      arr[minIndex] = tmp;
                }
          }
    }
    public void median(){
        if (m%2==0){
            double median = (arr[m/2]+arr[(m/2)+1])/2;
            System.out.println("the median is "+median);
        }
        else {
            System.out.println("the median is "+arr[(m/2)+1] );
        }
    }

}

---

You need to add the static modifier to your methods and fields. If you don't understand why, I recommend you read the Learning the Java Language tutorial.

---

First: create an object from that class. Second: call the methods.

Like this:

  public static void main(String[] args) {
        // TODO Auto-generated method stub
        // need to call methods

        //creating object
        Median m = new Median();

        //calling methods from the object
        m.selectionSort();
        m.median();
    }

UPDATE: You don't need to create the constructor unless you want to put some customized code in it.

PS: Class names: first letter in always in capitals = best practices.

---

public static void main(String[] args){
   median m1 = new median();
   m1.selectionSort();
   m1.median();
}

---

Create an instance of yourself, and invoke the methods:

public static void main(String[] args) {
  median me = new median();
  me.selectionSort();
}

Incidentally, you should consider renaming median to be Median to conform with Java class naming conventions.