AdvanceJava

Introductions to generics in Java

For Loops

Loop that executes a specified number of times

Its is count controlled as opposed to condition controlled. count control means the "For loop" executes a specified number of times.

Problem

Write a cashier program that will scan a given number of items and tally the cost.

import java.util.Scanner;

public class Chashier {

public static void main(String[] args) {
    
    //Get number of items to scan 

    System.out.print("Enter the number of items you would like to scan: ");

    Scanner scanner = new Scanner(System.in);
     int quantity = scanner.nextInt();

    double total = 0;

    // Create loop to iterate through all of the items and accumulate the costs

    for(int i =1; i<=quantity; i++){

        //System.out.print("Enter the cost of the item 1 : ");
             
        System.out.print("Enter the cost of the item " + i + " : ");
       
        double price = scanner.nextDouble();

        total =total + price;


    }

    scanner.close();
    System.out.println("Your total is: " + total);

}

}

For loop are Count Controlled

Loop runs a specified number of times.

Pretest

Condition is tested before entering the lopp.

Execution

Best to use when you know howmany time the loop should be executed.

Nested Loops

Loopes Inside of loops

Problem

Find the average test score for each student in the class. There are 24 students and four tests.

import java.util.Scanner;

public class AverageTestScores {

public static void main(String[] args) {
    
    // Initialize what we know

    int numverOfStudent = 24;
    int numberOfTests = 4;

    Scanner scanner = new Scanner(System.in);

    // let's proccess all students
    for(int i=0; i<numverOfStudent; i++){

        double total= 0;

        System.out.println("___________Student: " + (i+1)+ "___________");

        //process a student's test scores

        for(int j=0; j<numberOfTests;j++){

            System.out.println("Enter the score for test #" + (j+1) + " : ");

            double score = scanner.nextDouble();

            total= total + score;

        }

        double average = total/numberOfTests;
        System.out.println("The test avarage for student #" + (i+1) + " is: " + average);
    }




    scanner.close();
}

}