findSumEvenNumbersInRange()

Step 1: Function Signature

The first step is to define the function signature. In java, it starts with the access modifier public, then the return type of the function which is int in our case followed by the function name and parameters. In this case, it needs two parameters, which are the start and end range for which we want to find the sum of even numbers.

public int findSumEvenNumbersRange(int start, int end){}

Step 2: Add loop

Inside this function, we need to iterate over range of numbers from start to end using a for loop.

public int findSumEvenNumbersRange(int start, int end){
  for(int i=start; i<=end; i++){}
}

Step 3: Add Condition

Next, we need to check if the number is even. We can do this using the modulus operator %. If a number i is even, i % 2 will be equal to 0.

public int findSumEvenNumbersRange(int start, int end){
  for(int i=start; i<=end; i++){
    if(i % 2 == 0){}
  }
}

Step 4: Add Sum Calculation

Inside the if statement we should add the conditional logic. For our case, we need to calculate the sum of the even numbers, therefore we will use the += operator to add the even number to our sum which is initially set to 0.

public int findSumEvenNumbersRange(int start, int end){
  int sum = 0;
  for(int i=start; i<=end; i++){
    if(i % 2 == 0){
      sum += i;
    }
  }
}

Step 5: Return the Result

Finally, after iterating over all the numbers and summing up the even numbers, we need to return the result. This is done by simply adding return sum; at the end of our function.

public int findSumEvenNumbersRange(int start, int end){
  int sum = 0;
  for(int i=start; i<=end; i++){
    if(i % 2 == 0){
      sum += i;
    }
  }
  return sum;
}

That's it, we have implemented the function to find the sum of even numbers in a given range in Java.