1// Aim: Program to perform Exception Handling operations (InterfaceTask).
2interface Account {
3    void deposit(double amt);
4    void withdraw(double amt);
5    double viewBalance();
6}
7
8class InterfaceTask implements Account{
9
10    private double bal;
11    private double intrate;
12
13    public InterfaceTask(double bal,double intrate){
14        this.bal=bal;
15        this.intrate=intrate;
16    }
17
18    public void deposit(double amt){
19        if(amt>0){
20            bal+=amt;
21            System.out.println("deposited :"+amt);
22            System.out.println("new balance :"+bal);
23        }
24        else{
25            System.out.println("invalid amount");
26        }
27    }
28
29    public void withdraw(double amt){
30        if(amt>0 && bal>=amt){
31            bal-=amt;
32            System.out.println("withdrawn :"+amt);
33            System.out.println("new balance :"+bal);
34        }
35        else{
36            System.out.println("invalid amount");
37        }
38    }
39
40    public double viewBalance(){
41        return bal;
42    }
43
44    public void addInterest(){
45        bal+=bal*intrate/100;
46    }
47}
48
49class CurrentAccount implements Account{
50
51    private double bal;
52    private double overdraft;
53
54    public CurrentAccount(double bal,double overdraft){
55        this.bal=bal;
56        this.overdraft=overdraft;
57    }
58
59    public void deposit(double amt){
60        if(amt>0){
61            bal+=amt;
62            System.out.println("deposited :"+amt);
63            System.out.println("new balance :"+bal);
64        }
65        else{
66            System.out.println("invalid amount");
67        }
68    }
69
70    public void withdraw(double amt){
71        if(amt>0 && bal+overdraft>=amt){
72            bal-=amt;
73            System.out.println("withdrawn :"+amt);
74            System.out.println("new balance :"+bal);
75        }
76        else{
77            System.out.println("invalid amount");
78        }
79    }
80
81    public double viewBalance(){
82        return bal;
83    }
84
85    public void overdraft(){
86        System.out.println("overdraft :"+overdraft);
87    }
88}
89
90public class Interface{
91    public static void main(String[] args){
92        InterfaceTask sa=new InterfaceTask(1000,5);
93        CurrentAccount ca=new CurrentAccount(1000,500);
94
95        sa.deposit(1000);
96        sa.withdraw(500);
97        sa.addInterest();
98        System.out.println("saving account balance :"+sa.viewBalance());
99
100        ca.deposit(1000);
101        ca.withdraw(2500);
102        ca.overdraft();
103        System.out.println("current account balance :"+ca.viewBalance());
104    }
105}