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Design Patterns in Java - Bridge Pattern

Bridge Pattern


Is like Adapter Design Pattern but focus to the future


  • Decouple Abstraction and implementation

  • Decouple abstraction from implementation
  • Changes in abstraction don't affect the client
  • Ex. JDBC 

Example:

  • Shape class is the abstraction
    • Execute the implementation of the interface
  • Color is the interface
    • The interface will be executed by the class that extends from Shape

public class Shape2BridgeDemo {
    
    public static void main(String args[]){
        Color blue = new Red();
        
        Shape square = new Square(blue);
        
        square.applyColor();
    }
}

----------------------------------------------------------

abstract class Shape {
    
    protected Color color;
    
    public Shape(Color color){
        this.color = color;
    }
    
    abstract public void applyColor();
}

--------------------------------------------------------------

public class Square extends Shape {

    public Square(Color color) {
        super(color);
    }

    @Override
    public void applyColor() {
        color.applyColor();
    }
    
}

------------------------------------------------------------------
public interface Color {
    
    public void applyColor();
    
}
------------------------------------------------------------------
public class Red implements Color {

    public Red() {
    }

    @Override
    public void applyColor() {
        System.out.println("Applying color: red");
    }
    
}


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