Java Array difficulty level Handson - 3

Question

Concept - Array Difficulty Level 3

Create a class Account with below attributes:

int - number

String - acType

double - balance

int - noOfAccountHolders

Make all the attributes private.Create corresponding getters and setters.

Create a constructor which takes all parameters in the above sequence.

The constructor should set the value of attributes to parameter values inside the constructor.

Create a class AccountDemo with main method

Create the below static method sortAccountByNumber in the AccountDemo class.

sortAccountByNumber(Account[] objArray)

The method will sort the array based on number and return the sorted array.

Create an array of 5 Account objects in the main method

Refer below sample main method and test the output:

Call the above static method from the main method

public class AccountDemo {
public static void main(String args[]){
Account account1= new Account(79,"dxqfkje",750.0,32);
Account account2= new Account(70,"yzfsutw",759.0,42);
Account account3= new Account(24,"iqqlcfr",966.0,85);
Account account4= new Account(27,"xqaibfl",733.0,75);
Account account5= new Account(79,"jxpsdpo",324.0,54);

Account[] objArray= {account1,account2,account3,account4,account5};

Account[] objArrayRes= sortAccountByNumber(objArray);
System.out.println("Displaying contents of array: ");

for(Account account:objArray){
System.out.println(account.getNumber()+" " + account.getAcType()+" " + account.getBalance()+" " + account.getNoOfAccountHolders()+" ");
}
}}

Output

Displaying contents of array:
24 iqqlcfr 966.0 85
27 xqaibfl 733.0 75
70 yzfsutw 759.0 42
79 dxqfkje 750.0 32
79 jxpsdpo 324.0 54

Solution:

import java.util.Arrays;
import java.util.Comparator;
import java.util.List;

class AccountDemo{
public static void main(String[] args) {
Account account1= new Account(79,"dxqfkje",750.0,32);
Account account2= new Account(70,"yzfsutw",759.0,42);
Account account3= new Account(24,"iqqlcfr",966.0,85);
Account account4= new Account(27,"xqaibfl",733.0,75);
Account account5= new Account(79,"jxpsdpo",324.0,54);

Account[] objArray= {account1,account2,account3,account4,account5};

Account[] objArrayRes= sortAccountByNumber(objArray);
System.out.println("Displaying contents of array: ");

for(Account account:objArray){
System.out.println(account.getNumber()+" " + account.getAcType()+" " + account.getBalance()+" " + account.getNoOfAccountHolders()+" ");
}
}

private static Account[] sortAccountByNumber(Account[] objArray) {
List<Account> ls = (List<Account>) Arrays.asList(objArray);
ls.sort(new Account());
objArray = new Account[ls.size()];
ls.toArray(objArray);
return objArray;
}
}

class Account implements Comparator<Account>{
int number;
String acType;
double balance;
int noOfAccountHolders;

public Account(){

}
/**
* @return the number
*/
public int getNumber() {
return number;
}

/**
* @param number the number to set
*/
public void setNumber(int number) {
this.number = number;
}

/**
* @return the acType
*/
public String getAcType() {
return acType;
}

/**
* @param acType the acType to set
*/
public void setAcType(String acType) {
this.acType = acType;
}

/**
* @param balance the balance to set
*/
public void setBalance(double balance) {
this.balance = balance;
}

/**
* @return the balance
*/
public double getBalance() {
return balance;
}

/**
* @return the noOfAccountHolders
*/
public int getNoOfAccountHolders() {
return noOfAccountHolders;
}

/**
* @param noOfAccountHolders the noOfAccountHolders to set
*/
public void setNoOfAccountHolders(int noOfAccountHolders) {
this.noOfAccountHolders = noOfAccountHolders;
}

public Account(int number,String acType , double balance , int noOfAccountHolders){
this.number = number;
this.acType = acType;
this.balance = balance;
this.noOfAccountHolders = noOfAccountHolders;
}

@Override
public int compare(Account o1, Account o2) {
// TODO Auto-generated method stub
return o1.number - o2.number;
}
}

java handson 3: About