what is an abstract method signayure in java code example
Example 1: What are abstract methods in java
An abstract method is the method which does’nt have any body.
Abstract method is declared with
keyword abstract and semicolon in place of method body.
public abstract void <method name>();
Ex : public abstract void getDetails();
It is the responsibility of subclass to provide implementation to
abstract method defined in abstract class
Example 2: how to make abstract method in java
public abstract class Account { //abstract class //perent class
protected int accountNumber;
protected Customer customerObj;
protected double balance;
//constructor
public Account(int saccountNumber, Customer scustomerObj,double sbalance){
accountNumber = saccountNumber;
customerObj = scustomerObj;
balance = sbalance;
}
// abstract Function
public abstract boolean withdraw(double amount);
}
public class SavingsAccount extends Account { // child class
private double minimumBalance;
// constructor
public SavingsAccount(int saccountNumber, Customer scustomerObj, double sbalance, double sminimumBalance) {
super(saccountNumber, scustomerObj, sbalance);
minimumBalance = sminimumBalance;
}
// Implementation of abstract function in child class
public boolean withdraw(double amount) {
if (balance() > minimumBalance && balance() - amount > minimumBalance) {
super.setBalance(balance() - amount);
return true;
} else {
return false;
}
}
}