Help on Arrays...

[cuellar14]

My project consists in an array that adds, finds, deletes lists all the contenst within the array.

Here's the code for my menu but i don't know how to initiate the array or create the mthods to add, find or delete the contents...

I also need to do it using two different classes

Thank you



import java.io.*;
import java.text.*;
import javax.swing.*;

class CuellarProjectArray {

public static void main(String[] args) throws IOException{

String str, company;
int choice, selection;
boolean keepRunning = true;

do {

JOptionPane.showMessageDialog(null, "This program stores customer's information");
str = JOptionPane.showInputDialog(null, "What do you like to do?\n" + "(to add enter 1)\n" + "(to find enter 2)\n" + "(to delete enter 3)");
choice = Integer.parseInt(str);

switch(choice) {

case 1:
company = JOptionPane.showInputDialog(null, "Enter customer information");
break;

case 2:
company = JOptionPane.showInputDialog(null, "Enter customer information");
break;

case 3:
company = JOptionPane.showInputDialog(null, "Enter customer information");
break;

default:
JOptionPane.showMessageDialog(null, "Invalid choice");

}

selection = JOptionPane.showConfirmDialog(null, "Would you like to return to the main menu?", "Confirmation", JOptionPane.YES_NO_OPTION);

keepRunning = (selection == JOptionPane.YES_OPTION);

}while (keepRunning);
}
}

[anandguna]

use the for loop and iterate the array values

String a="arul";
for (int i=0;i<arraystring.length();i++)
{
if(a==arraystring[i])
{ System.out.println("match found");

}


}

[cuellar14]

i don't understand how to use that... where would i put it?

[Norm]

how to initiate the array

type[] name = new type[<size>]; // create an array
name[i] = new type(); // add an element to array at index i


You'll want to change the following to use a method for comparing the two strings in place of using ==

 if(a==arraystring[i])

[tim]

Hello anandguna

use the for loop and iterate the array values

String a="arul";
for (int i = 0; i < arraystring.length(); i++)
    if ([COLOR="RoyalBlue"]a == arraystring[i][/COLOR])
        System.out.println("match found");

As Norm pointed out, the equality in blue uses to == operator. In Java, if the == operator is used on two variables of object type, like a String for example, then the test will return true if the variables reference the same object. Otherwise false is obtained. Primitive types, like int byte boolean or double, are tested for equality by value, as they are not objects. To test if two strings are equal, use the boolean String.equals(String other) method. For example:

if ([COLOR="RoyalBlue"]a.equals(arraystring[i])[/COLOR]) {
    System.out.println("match found");
}

Please ask if you want me to explain more, anandguna. ;)