SINGLE INHERITANCE

Single Inheritance is the simple inheritance of all, When a class extends another class(Only one class) then we  call it as Single inheritance. The below diagram represents the singleinheritance in java where Class B extends only one class Class A. Here Class B will be the Sub class and Class A will be one and only Super class.
Single Inheritance Example

public class ClassA 
{
    public void dispA()
    {
        System.out.println("disp() method of ClassA");
    }
}
public class ClassB extends ClassA 
{
    public void dispB()
    {
        System.out.println("disp() method of ClassB");
    }
    public static void main(String args[])
    {
        //Assigning ClassB object to ClassB reference
        ClassB b = new ClassB();
        //call dispA() method of ClassA
        b.dispA();
        //call dispB() method of ClassB
        b.dispB();
    }
}

Output :

disp() method of ClassA
disp() method of ClassB