# Template

Paul Tomoiu

●

Examples,

Design patterns

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Published 2022-12-03

This tutorial explains to you the design pattern named Template (which is a Structural Pattern).

# Template Pattern - theory

Template Method Design Pattern in Java is used when we want to define some generic steps/tasks in an abstract master class, but the implementation of them separately in concrete child classes.

The Template Method Pattern is a very common technique for reusing code.

Take a look at the following UML diagram representing the Template Method design pattern (for my example):

# Template Pattern - example

Here is an example of using the Template Design Pattern in Java:

package templatemethod.java.pattern.example;
 
public abstract class Enjoy {
    abstract void playGame1();
    abstract void playGame2();
 
    //template method
    public final void play(){
 
        playGame1();
        playGame2();
    }
}

package templatemethod.java.pattern.example;
 
public class EnjoyInWinter extends Enjoy {
 
    @Override
    void playGame1() {
        System.out.println("I GO SKIING.");
    }
 
    @Override
    void playGame2() {
        System.out.println("I BUILD a SNOWMAN.");
    }
 
}

package templatemethod.java.pattern.example;
 
public class EnjoyInSummer extends Enjoy {
 
    @Override
    void playGame1() {
        System.out.println("I GO SWIMMING.");
    }
 
    @Override
    void playGame2() {
        System.out.println("I PLAY SOCCER.");   
    }
 
}

package templatemethod.java.pattern.example;
 
public class TemplateMethodJavaPatternExample {
 
    public static void main(String[] args) {
        Enjoy summer = new EnjoyInSummer();
        summer.play();
         
        System.out.println("");
         
        Enjoy winter = new EnjoyInWinter();
        winter.play();
    }
}

When you run this example you will receive the following result: