Polymorphism:
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package org.sample;

public class Employee {

	public void empId(String name) {
		System.out.println("String method " +name);
	}
	//count of arguments
	public void empId(String name,char block,long phno) {
		System.out.println("String char long method " +name);
		System.out.println(block+"\n"+phno);
	}
	//data type
	public void empId(int regno) {
		System.out.println("int method " +regno);
	}
	public void empId(boolean perEmp) {
		System.out.println("boolean method " +perEmp);
	}
	//order
	public void empId(String manager ,boolean project) {
		System.out.println("String String method " +manager+"\n"+project);
	}
	public void empId(String email ,float sal) {
		System.out.println("String float method " +email+"\n"+sal);
	}
	public static void main(String[] args) {
	Employee emp=new Employee();
	emp.empId("nisha");
	emp.empId("nisha@gmail.com", 12313.34534f);
	emp.empId("vel", 'a', 99441152058l);
}
}

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package org.sample;

public class IciciBank {

	public void saving() {
		System.out.println("6%");
	}
	
	public void deposit() {
		System.out.println("3%");
	}
}

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package org.sample;

public class GreenBank extends IciciBank{

	@Override
	public void deposit() {
		System.out.println("5%");
	}
	
	public void fixed() {
		System.out.println("7%");
	}
	
	public static void main(String[] args) {
		GreenBank bank=new GreenBank();
		bank.saving();
		bank.deposit();
		bank.fixed();
	}
}