I\'m getting this error: Exception in thread \"main\" java.lang.NoSuchMethodErro

Question

I'm getting this error:

Exception in thread "main" java.lang.NoSuchMethodError: main

I tried using public static void main(String[] args){ but that negates all of the methods that I try to write.

I'm just trying to make it so that I can enter values. Thanks.

Code below:

import java.util.Scanner;

public class DataSet2 {

private double value;

private double sum;

private int count;

public void add(double value){

   System.out.println("Enter values, enter -1 to finish");

   Scanner scan = new Scanner(System.in);

   value = scan.nextDouble();

   while (value !=-1){

   sum =+ value;

   if(count<=0){System.out.println("Sorry, that value is not accepted");}

   }

}

public void getAverage(){

   while (sum >0){

       count++;

   double average = sum/count;

   System.out.println("The average is: " + average);

   }

}

public void getLargest(){

   double largest =0;

   if (value > largest)

       largest = value;

       System.out.println("The largest is: " + largest);

}

public void getSmallest(){

   double smallest =0;

   if (value<smallest)

       smallest= value;

   System.out.println("The smallest is: " + smallest);

}

}

import java.util.Scanner;

public class DataSet2 {

private double value;

private double sum;

private int count;

public void add(double value){

   System.out.println("Enter values, enter -1 to finish");

   Scanner scan = new Scanner(System.in);

   value = scan.nextDouble();

   while (value !=-1){

   sum =+ value;

   if(count<=0){System.out.println("Sorry, that value is not accepted");}

   }

}

public void getAverage(){

   while (sum >0){

       count++;

   double average = sum/count;

   System.out.println("The average is: " + average);

   }

}

public void getLargest(){

   double largest =0;

   if (value > largest)

       largest = value;

       System.out.println("The largest is: " + largest);

}

public void getSmallest(){

   double smallest =0;

   if (value<smallest)

       smallest= value;

   System.out.println("The smallest is: " + smallest);

}

}

Explanation / Answer

Hi,

I have updated the code to read the values and highlighted the code changes below

DataSet2.java

import java.util.Scanner;
public class DataSet2 {
private double value;
private double sum=0;
private int count = 0;

public static void main(String[] args){
   DataSet2 d = new DataSet2();
   d.add();
   d.getAverage();
}
public void add(){
System.out.println("Enter values, enter -1 to finish");
Scanner scan = new Scanner(System.in);
value = scan.nextDouble();
while (value !=-1){
sum = sum + value;
count++;
value = scan.nextDouble();
}
}
public void getAverage(){
double average = sum/count;
System.out.println("The average is: " + average);

}   
public void getLargest(){
double largest =0;
if (value > largest)
largest = value;
System.out.println("The largest is: " + largest);
}
public void getSmallest(){
double smallest =0;
if (value<smallest)
smallest= value;
System.out.println("The smallest is: " + smallest);
}

}

Output:

Enter values, enter -1 to finish
1
2
3
4
-1
The average is: 2.5

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