Generics Interface in java

/*In similar way, we can create generic interfaces in java. We can also have multiple type parameters as in Map interface. Again we can provide parameterized value to a parameterized type also, for example new HashMap<String, List<String>>(); is valid.*/
package java.lang;
import java.util.*;

public interface Comparable<T> {
    public int compareTo(T o);
}

Source: journaldev.com

Generics Interface in java

/*Suppose we want to restrict the type of objects that can be used in the parameterized type, for example in a method that compares two objects and we want to make sure that the accepted objects are Comparables. To declare a bounded type parameter, list the type parameter’s name, followed by the extends keyword, followed by its upper bound, similar like below method.

The invocation of these methods is similar to unbounded method except that if we will try to use any class that is not Comparable, it will throw compile-time error.

Bounded type parameters can be used with methods as well as classes and interfaces.

Java Generics supports multiple bounds also, i.e <T extends A & B & C>. In this case, A can be an interface or class. If A is class then B and C should be an interface. We can’t have more than one class in multiple bounds.*/
public static <T extends Comparable<T>> int compare(T t1, T t2){
		return t1.compareTo(t2);
	}

Source: journaldev.com

Similar codes

6 votes191 views6 answers
Do while loop in java
Java
2 votes193 views3 answers
Design custom button in android
Java
0 vote206 views1 answer
Simple text formatter as in textbook
Java
0 vote175 views1 answer
Java stream code to ignore null
Java
-1 vote191 views2 answers
Convert long to localdatetime java
Java
1 vote181 views1 answer
Exponential in java
Java
0 vote208 views3 answers
Find space in string
Java
0 vote187 views2 answers
Spring boot base url
Java
0 vote204 views2 answers
How do I change the opacity of a JButton
Java
1 vote182 views2 answers
String comparison using == in java
Java