SolidPrincipleL.java

package galihlprakoso.com.solidprinciple;

/**
 *
 * @author galihlarasprakoso
 */
class AlatMusik {
    public void berbunyi(){
        System.out.println("Bunyi alat musik...");
    }
}

class Gitar extends AlatMusik{
    @Override
    public void berbunyi(){
        System.out.println("Jrengg...");
    }
}

class Biola extends AlatMusik{
    @Override
    public void berbunyi(){
        System.out.println("Ngek ngok ngek ngik...");
    }
}