Contoh polimorfisme pada java.

oop-polimorfisme.java

package galihlprakoso.com.polimorfisme;

/**
 *
 * @author galihlarasprakoso
 */
abstract class BangunDatar {
    abstract double hitungKeliling();
    abstract double hitungLuas();
}

class Lingkaran extends BangunDatar{
    private double diameter;
    private double jariJari;
    private final double pi = 3.14159265358979323846;
    
    public Lingkaran(double diameter){
        this.diameter = diameter;
        this.jariJari = 0.5*diameter;              
    }

    @Override
    public double hitungKeliling() {
        return 2*pi*jariJari;
    }

    @Override
    public double hitungLuas() {
        return pi*Math.pow(jariJari, 2);
    }           
}

class SegitigaSamaSisi extends BangunDatar{
    
    private double sisi;
    
    public SegitigaSamaSisi(double sisi){
        this.sisi = sisi;
    }
    
    @Override
    public double hitungKeliling() {
        return sisi*3;
    }

    @Override
    public double hitungLuas() {
        return (Math.pow(sisi, 2)/4)*(Math.sqrt(3));
    }
    
}

class Persegi extends BangunDatar{
    
    private double sisi;
    
    public Persegi(double sisi){
        this.sisi = sisi;
    }

    @Override
    double hitungKeliling() {
        return sisi*4;
    }

    @Override
    double hitungLuas() {
        return Math.pow(sisi,2);
    }
    
}

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