id is of primitive type int and not an Object. You cannot call methods on a primitive as you are doing here : id.equals Try replacing this: if (id.equals(list[pos].getItemNumber())){ //Getting error on “equals” with if (id == list[pos].getItemNumber()){ //Getting error on “equals”
boolean isPalindrome(String input) { for (int i=0; i < input.length() / 2; ++i) { if (input.charAt(i) != input.charAt(input.length() – i – 1)) { return false; } } return true; } This solution is self explanatory, the only edge case requiring explanation is what happens for words with an odd number of letters. For an input … Read more
Recursion is the act of a function calling itself. Under the hood function calls are pushed to the stack of the system and when a function finishes execution, it will be popped from the stack. A stack is a data structure which stores items and has the following operations: push: puts an item to the … Read more
You calculation for the average is all wrong. You have to find the sum of the horsepower, then divide it by the total number of cars matching your criterion. What you do instead is… divide the running average by the new HP and then add one to it? Looks like an assignments, so here’s some … Read more
BlueJ is a development environment which is a deliberately smaller and simpler interface than professional environments like NetBeans or Eclipse. This allows beginners to get started more quickly and hence doesnt force you to write the main() instead it does it for you in the background https://www.cs.utexas.edu/users/scottm/cs307/handouts/BlueJProjectInstructions.html Where as Netbeans and Eclipse mandate that you … Read more