Multiple inheritance in java

In this tutorial we will discuss
1. Diamond Problem and Multiple Inheritance
2. Ambiguity Resolution tactics

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A class can't extend multiple base classes. This is because, derived class may inherit different implementation for the same method from multiple base classes. In Java, a class can extend multiple interfaces.

Constants : Same constant names from multiple interfaces are allowed, provided that the calls are not ambiguous

Abstract Methods : Same abstract method names are allowed, provided they have same signature or are properly overloaded

Default Methods
1. Same Diamond Problem
2. Must be overridden in derived class
3. Overloaded versions will also work

Static Methods
1. Same name allowed in all cases
2. Because they are not inherited
3, Easiest ones

Example programs used in the tutorial :

package com.training.java;

public interface Interviewer {

// public static final constant
int maxInterviewsPerWeek = 3;

// public abstract methods
void conductInterview();

}


package com.training.java;

public class Manager implements Employee, Instructor {

Manager() {
//System.out.println(HRS_TO_WORK);
}

@Override
public void work() {
System.out.println("I work ");
}

}


package com.training.java;

public interface Employee {
int HRS_TO_WORK = 10;
void work();
}


package com.training.java;

public interface Instructor {
int HRS_TO_WORK = 14;
void work();
}