multiple inheritances is achieved in Java:

Java does not provide an explicit way to implement multiple-inheritance i.e. a class can never extend multiple classes. But, this can be achieved (simulated) using interfaces. This is possible because of two reasons:

· A class can implement multiple interfaces

· A class can simultaneously extend a class and implement one or more interfaces

The forms of the above two are shown below:

1. interface A { …. } interface B { .… } class C implements A, B { …. }

2. class A { …. } interface B { .… } class C extends A implements B { …. }

The following program illustrates how interfaces can be used to simulate multiple inheritance. The program has an interface named Allowance and a class named Employee. The class named EmpSal extends Employee and implements Allowance. Thus bringing an effect that the class takes multiple inheritance.

interface Allowance

{

int DA = 2000;

int HRA = 3000;

}

class Employee

{

private int empno;

private String ename;

public void getdata(int eno,String n)

{

empno=eno;

ename=n;

}

public void show()

{

System.out.println("Empno:" +empno);

System.out.println("EName:" +ename);

}

}

class EmpSal extends Employee implements Allowance

{

private double sal;

public void getdata(int eno,String n, double s)

{

super.getdata(eno,n);

sal=s;

}

public void totalsalary()

{

super.show();

System.out.println("Total Sal:" + (sal+DA+HRA));

}

}

class Test

{

public static void main(String as[])

{

EmpSal e1=new EmpSal();

e1.getdata(7369,"Ravi",12000);

e1.totalsalary();

}

}

Output:

Empno: 7369

EName: Ravi

Total sal:17000