Charge Account Validation Using Java programming Create a class with a method that accepts a charge account number as its argument. The method should determine whether the number is valid by comparing it to the following list of valid charge account numbers: 5658845    4520125    7895122    8777541    8451277    1302850 8080152    4562555    5552012    5050552    7825877    1250255 1005231    6545231    3852085    7576651    7881200    4581002 These numbers should be stored in an array. Use a sequential search  to locate the number passed as an argument. If the number is in the array, the method should return true, indicating the number is valid. If the number is not in the array, the method should return false, indicating the number is invalid. Write a program that tests the class by asking the user to enter a charge account number. The program should display a message indicating whether the number is valid or invalid.

Q1.  amount the same, y, n, why? public class CheckingAct {   private String actNum;   private String nameOnAct;   private int    balance;     . . . .   public void processDeposit( int amount )   {        balance = balance + amount ;   }     // modified toString() method   public String toString()   {     return  "Account: " + actNum + "\tName: " + nameOnAct +             "\tBalance: " +  amount ;   }   }     Q2.  amount the same, y, n, why?   public class CheckingAct {   private String actNum;   private String nameOnAct;   private int    balance;     . . . .     public void  processDeposit( int amount )   { // scope of amount starts here     balance = balance + amount ;          // scope of amount ends here   }     public void processCheck( int amount )   { // scope of amount starts here     int charge;       incrementUse();     if ( balance < 100000 )       charge = 15;     else       charge = 0;       balance =  balance - amount - charge  ;     // scope of amount ends here   }…

T/F 1. Java methods can only return primitive types

Java

Code special Calculator

1. Square Roots Create a class with a method that, given an integer, returns an array of double-precision floating point numbers (known in Java as double), each of which is a square root of a number between 2 and the parameter to the method. For example, if the parameter is 5, the method should return an array of 4 doubles, with approximate values 1.4142135623, 1.7320508075, 2.0, and 2.2360679774. Your method should check the validity of the parameter, and take appropriate action if the parameter is invalid. 2. Reading Files Create a class with a method that, given a string representing a file name, returns an integer with the number of characters in the file. For example, if the file has 10 characters, your method must return the number 10. 3. Main Class Create a class HW1.java with a main method that does both of the following: calls the method from part 1 with a random integer between 0 and 10, and prints each of the numbers in the result. The numbers should all be printed on the…

28Recursive methods must always contain a path that does not contain a recursive call. T OR F

JAVA:

// SuperMarket.java - This program creates a report that lists weekly hours worked  // by employees of a supermarket. The report lists total hours for  // each day of one week.  // Input:  Interactive // Output: Report.  import java.util.Scanner; public class SuperMarket {    public static void main(String args[])     {       // Declare variables.       final String HEAD1 = "WEEKLY HOURS WORKED";       final String DAY_FOOTER = "          Day Total ";  // Leading spaces are intentional.       final String SENTINEL = "done";     // Named constant for sentinel value.        double hoursWorked = 0;             // Current record hours.       String hoursWorkedString = "";      // String version of hours       String dayOfWeek;       // Current record day of week.       double hoursTotal = 0;           // Hours total for a day.       String prevDay = "";             // Previous day of week.       boolean done = false;            // loop control       Scanner input = new…

Recursive Power MethodWrite a method called powCal that uses recursion to raise a number to a power. The method should accept two arguments: The first argument is the exponent and the second argument is the number to be raised (example” powCal(10,2) means 210). Assume that the exponent is a nonnegative integer. Demonstrate the method in a program called Recursive (This means that you need to write a program that has at least two methods: main and powCal. The powCal method is where you implement the requirements above and the main method is where you make a method call to demonstrate how your powCal method work).