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Thread: Help for write Bank application in Java

  1. #1
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    Default Help for write Bank application in Java

    Hi.
    I'm a student and I need write a programe bank application in java .
    I must write a program that the customer could withdraw and deposit from his account.I wrote this program.
    but I need to use several classes for this program (object oriented). for exemple:
    BankAccount which has an instance variable amount
    and has methods:
    withDraw which takes a parameter -> amountToWithDraw
    deposit -> amountToAdd
    checkBalance -> which takes no parameters, but which returns the value in the instance variable amount.
    but i dont know how use of several classes.
    you can help me?


    import java.util.Scanner;
     
    public class BankAccount {
    public static void main(String[] args) {
     
    Scanner clapton=new Scanner(System.in);
    int x;
    float balance = 0;
    boolean quit=false;
    do {
    System.out.println("1. Deposit money");
     
    System.out.println("2. Withdraw money");
     
    System.out.println("3. Check balance");
     
    System.out.print(" 0 to quit: ");
     
    System.out.println("enter your choice :");
     
    x=clapton.nextInt();
    if (x==1) {
     
    float amount;
    System.out.println(" Amount to deposit :");
    amount=clapton.nextFloat();
    if (amount>=0) {
    balance += amount;
    }
    else {
    System.out.println("system can't reply your request");
    }
     
    }
    else if (x==2) {
    float amount;
    System.out.println(" Amount to withdraw :");
    amount =clapton.nextFloat();
    if (amount<=0 || amount > balance) {
    System.out.println("system can't reply your request ");
     
    }
    else {
    balance -= amount;
    }
    }
    else if (x==3) {
    System.out.println("your balance :" + balance );
    }
    else if (x==0) {
    quit=true;
    }
    else {
    System.out.println("wrong choice");
    }
    }
    while (!quit);
    System.out.println("bye");
    }
    }


  2. #2
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    Default Re: Help for write Bank application in Java

    but i dont know how use of several classes.
    you can help me?
    Don't worry, hang on... To use a class from another class, create a new instance of the class using new keyword, then use dot operator on the instance to invoke methods of the class. For example:

    class A {
        void foo() {}
    }
     
    class B {
        // invoke foo() method of class A:
        public void useA() {
            A a = new A();
            a.foo();
        }
    }

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