What does super(<parameter>) means?

Question

I solved this problem in a java course on overriding but I'm not sure what the code "super(amount)" does in this code below, an explanation would be very much appreciated

Code:

import java.util.Scanner;
class Main {
public static void main(String[] args) {
Scanner read = new Scanner(System.in);
double saving = read.nextDouble();
double checking = read.nextDouble();

Account savingAcc = new SavingAcc(saving);
Account checkingAcc = new CheckingAcc(checking);

System.out.println(savingAcc.getIncome());
System.out.println(checkingAcc.getIncome());

}
}
class Account {

private double amount;

public Account(double amount) {
this.amount = amount;
}

public double getAmount() {
return amount;
}

public double getIncome() {
return 0;
}
}

class SavingAcc extends Account {

public SavingAcc(double amount) {
super(amount);
}
//Override the method for saving account
public double getIncome() {
return getAmount() + getAmount()*0.2;
}
}
class CheckingAcc extends Account {

public CheckingAcc(double amount) {
super(amount);
}
//Override the method for checking account
public double getIncome() {
return getAmount() + getAmount()*0.05;
}
}

Answer 1

Super refers to parent class