belajar script mencari luas bangun ruang !!

/*
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package tugas;

/**
 *
 * @author user2
 */
import javax.swing.JOptionPane;
public class bangun_ruang {
    private double angka1;
    private double angka2;
    private double angka3;
    private double angka4;
   
    public bangun_ruang(){
        JOptionPane.showMessageDialog(null,"Mari Belajar");
    }
   
    public void setAngka1 (double input){
        angka1=input;
    }
   
    public double getAngka1 (){
        return angka1;
    }
   
    public void setAngka2 (double input){
        angka2=input;
    }
   
    public double getAngka2 (){
        return angka2;
    }
}