class Lingkaran
{
private double jari_jari;

public Lingkaran()
{
setJariJari(1);
}

public void Lingkaran(double r)
{
if(r>0)
jari_jari=r;
else 
jari_jari=1.0;
}
public void setJariJari(double r)
{
if(r>0)
jari_jari=r;
}

public double getJariJari()
{
return(jari_jari);
}

public double hitungLuas()
{
return(Math.PI* jari_jari*jari_jari);
}

public double hitungKeliling()
{
return(Math.PI*2.0*jari_jari);
}
}

public class CobaLingkaran_2
{
public static void main(String args[])
{
Lingkaran abc=new Lingkaran();
Lingkaran pqr=new Lingkaran();
Lingkaran xyz=new Lingkaran();

pqr.setJariJari(5);
xyz.setJariJari(3.2);

System.out.println("Data Default");
System.out.println("=====================");
System.out.println("Jari-jari abc: " +abc.getJariJari());
System.out.println("Jari-jari pqr: " +pqr.getJariJari());
System.out.println("Jari-jari xyz: " +xyz.getJariJari());
System.out.println();

abc.setJariJari(5);
pqr.setJariJari(3.2);
xyz.setJariJari(1.8);

System.out.println("Data Sekarang: ");
System.out.println("=====================");
System.out.println("Jari-jari abc: " +abc.getJariJari());
System.out.println("Jari-jari pqr: " +pqr.getJariJari());
System.out.println("Jari-jari xyz: " +xyz.getJariJari());
System.out.println();
}
}