How to calculate substitution

[$tatic]

I created a class student, with 2 results for their exams. The first is Terminal marks and second is Exam marks. I created a method called average.

Here is the code for this method:

/ ** 
      * Calculates average of a list of integers 
      * / 
     public double average (List <integer> list) 
     { 
        double sum = 0.0; 
        for (int i = 0; i <list.size () i = i +1) 
        {
        sum = sum + list.get (i); 
        } 
        return sum/4; 
     }

This method works great, when I type in display pane:

Integer[] numberArray = {75, 59, 0, 70};
Student.average (Arrays.asList (numberArray));

51 is the result which is correct.

My problem is to create the following method. I have to calculate the average of Terminal over Exam marks divided by 2. For example 51 + 64 / 2, which gives me the result of substitution of 57%. Here is my code:

/ ** 
      * Calculates and sets the substitutionScore of the receiver 
      * / 
     public void calcSubstitutionScore ()    
     {
        for (int aScore:scores) 
        { 
           this. results. put (aScore, new HashSet<String> ( ) ) ;
        }
          for (String average: students. keySet ()) 
          { 
          for (String graded: this. results. get (average)) 
          { 
          this. results. get (graded). add (average) / 2; 
          }
          }
     }

[Ashok.M]

Why does not it function? What is the error message?

[$tatic]

It gives me a lot of syntax errors. For example for the line:

this.results.get (graded). add (average)/2;

It makes me: not a statement.

For the line:

for (int aScore : scores)

It makes me: cannot find symbol - variable score

I have in a class called Student: private int substitutionScore; Having 2 methods:

/ ** 
      * Sets the substitutionScore of the receiver to aScore
      * / 
     private void setSubstitutionScore (int aScore) 
     {
        this. substitutionScore = aScore; 
     }

   / ** 
      * Returns the substitutionScore of the receiver 
      * / 
     public int getSubstitutionScore () 
     { 
        return this. substitutionScore; 
     }

[Ashok.M]

In Java the use of the terms subject to different rules of visibility. It is not enough that you sent in your head, and so the Java will work.

As a very simple example:

{// Block 
   {// Another block 
     int quantity; // I declare my variable here 
  
    quantity = 45 // good: the variable quantity is declared in the same block 
    Quantity = 45 // syntax error here: quantity is not EQUAL to Quantity in Java 
   } 
   quantity = 45 // syntax error here: quantity is not declared in this block. 
  }