design a class for bank . bank class support following operations . a) deposit a certain amount into an account . b)withdraw a certain amount from an account c) return a balance value specifying the amount with details.

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1. import java.util.Scanner;  
2. class BankDetails {  
3.     private String accno;  
4.     private String name;  
5.     private String acc_type;  
6.     private long balance;  
7.     Scanner sc = new Scanner(System.in);  
8.     //method to open new account  
9.     public void openAccount() {  
10.         System.out.print("Enter Account No: ");  
11.         accno = sc.next();  
12.         System.out.print("Enter Account type: ");  
13.         acc_type = sc.next();  
14.         System.out.print("Enter Name: ");  
15.         name = sc.next();  
16.         System.out.print("Enter Balance: ");  
17.         balance = sc.nextLong();  
18.     }  
19.     //method to display account details  
20.     public void showAccount() {  
21.         System.out.println("Name of account holder: " + name);  
22.         System.out.println("Account no.: " + accno);  
23.         System.out.println("Account type: " + acc_type);  
24.         System.out.println("Balance: " + balance);  
25.     }  
26.     //method to deposit money  
27.     public void deposit() {  
28.         long amt;  
29.         System.out.println("Enter the amount you want to deposit: ");  
30.         amt = sc.nextLong();  
31.         balance = balance + amt;  
32.     }  
33.     //method to withdraw money  
34.     public void withdrawal() {  
35.         long amt;  
36.         System.out.println("Enter the amount you want to withdraw: ");  
37.         amt = sc.nextLong();  
38.         if (balance >= amt) {  
39.             balance = balance - amt;  
40.             System.out.println("Balance after withdrawal: " + balance);  
41.         } else {  
42.             System.out.println("Your balance is less than " + amt + "\tTransaction failed...!!" );  
43.         }  
44.     }  
45.     //method to search an account number  
46.     public boolean search(String ac_no) {  
47.         if (accno.equals(ac_no)) {  
48.             showAccount();  
49.             return (true);  
50.         }  
51.         return (false);  
52.     }  
53. }  
54. public class BankingApp {  
55.     public static void main(String arg[]) {  
56.         Scanner sc = new Scanner(System.in);  
57.         //create initial accounts  
58.         System.out.print("How many number of customers do you want to input? ");  
59.         int n = sc.nextInt();  
60.         BankDetails C[] = new BankDetails[n];  
61.         for (int i = 0; i < C.length; i++) {  
62.             C[i] = new BankDetails();  
63.             C[i].openAccount();  
64.         }  
65.         // loop runs until number 5 is not pressed to exit  
66.         int ch;  
67.         do {  
68.             System.out.println("\n ***Banking System Application***");  
69.             System.out.println("1. Display all account details \n 2. Search by Account number\n
70.  3. Deposit the amount \n 4. Withdraw the amount \n 5.Exit ");  
71.             System.out.println("Enter your choice: ");  
72.             ch = sc.nextInt();  
73.                 switch (ch) {  
74.                     case 1:  
75.                         for (int i = 0; i < C.length; i++) {  
76.                             C[i].showAccount();  
77.                         }  
78.                         break;  
79.                     case 2:  
80.                         System.out.print("Enter account no. you want to search: ");  
81.                         String ac_no = sc.next();  
82.                         boolean found = false;  
83.                         for (int i = 0; i < C.length; i++) {  
84.                             found = C[i].search(ac_no);  
85.                             if (found) {  
86.                                 break;  
87.                             }  
88.                         }  
89.                         if (!found) {  
90.                             System.out.println("Search failed! Account doesn't exist..!!");  
91.                         }  
92.                         break;  
93.                     case 3:  
94.                         System.out.print("Enter Account no. : ");  
95.                         ac_no = sc.next();  
96.                         found = false;  
97.                         for (int i = 0; i < C.length; i++) {  
98.                             found = C[i].search(ac_no);  
99.                             if (found) {  
100.                                 C[i].deposit();  
101.                                 break;  
102.                             }  
103.                         }  
104.                         if (!found) {  
105.                             System.out.println("Search failed! Account doesn't exist..!!");  
106.                         }  
107.                         break;  
108.                     case 4:  
109.                         System.out.print("Enter Account No : ");  
110.                         ac_no = sc.next();  
111.                         found = false;  
112.                         for (int i = 0; i < C.length; i++) {  
113.                             found = C[i].search(ac_no);  
114.                             if (found) {  
115.                                 C[i].withdrawal();  
116.                                 break;  
117.                             }  
118.                         }  
119.                         if (!found) {  
120.                             System.out.println("Search failed! Account doesn't exist..!!");  
121.                         }  
122.                         break;  
123.                     case 5:  
124.                         System.out.println("See you soon...");  
125.                         break;  
126.                 }  
127.             }  
128.             while (ch != 5);  
129.         }  
130.     }  

Write a java program to display the contents of a file in reverse order.

import java.io.*;
class Slip7
{
public static void main(String[] args)throws Exception
{
int ch,n=0,i=0,b;
FileInputStream fin=new FileInputStream("abc.txt");
while((ch=fin.read())!=-1)
{
n=n+1;
//System.out.println((char)ch);
}
char str[]=new char[n];
fin.close();
FileInputStream fin1=new FileInputStream("abc.txt");
while((b=fin1.read())!=-1)
{
str[i]=(char)b;
i++;
}
for(i=n-1;i>=0;i--)
{
System.out.print(str[i]);
}
fin.close();

}
}

A Java program that creates a Bank Account with withdraw, deposit, and intrest functions. And a tester class, that tests the SavingsAccount class..

/SavingsAccount public class SavingsAccount { private double balance; private double interest; public SavingsAccount() { balance = 0; interest = 0; } public SavingsAccount(double initialBalance, double initialInterest) { balance = initialBalance; interest = initialInterest; } public void deposit(double amount) { balance = balance + amount; } public void withdraw(double amount) { balance = balance - amount; } public void addInterest() { balance = balance + balance * interest; } public double getBalance() { return balance; } }

saving account tester.java

public class SavingsAccountTester

{

public static void main(String[] args)

{

SavingsAccount jimmysSavings = new SavingsAccount(1000, 0.10);

jimmysSavings.withdraw(250);

jimmysSavings.deposit(400);

jimmysSavings.addInterest();

System.out.println(jimmysSavings.getBalance());

System.out.println("Expected: 1265.0");

//1000-250=750 => 750+400=1150 => 1150+1150*0.10=1265.0

}

}