Contoh Coding Menghitung nilai rata-rata pada java

import java.io.*;
import java.text.DecimalFormat;

public class soal1 {
    public static void main(String args[]) throws IOException{
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    DecimalFormat df = new DecimalFormat();
    df.setMaximumFractionDigits(2);
    soal1 s1 = new soal1();
    System.out.println("+++ Program sederhana penghitung nilai rata-rata +++");
    System.out.print("   Masukkan bilangan pertama : ");
    s1.setN1(Double.parseDouble(br.readLine()));
    System.out.print("   Masukkan bilangan kedua   : ");
    s1.setN2(Double.parseDouble(br.readLine()));
    System.out.print("   Masukkan bilangan ketiga  : ");
    s1.setN3(Double.parseDouble(br.readLine()));
    System.out.println(" ");
    System.out.println("  "+s1.isStatus());
    System.out.println(" ");
    System.out.println("+-------------------------------------+");
    System.out.println("  Nilai Rata-Rata         : "+df.format(s1.NR()));
    System.out.println("+-------------------------------------+");
    }
    private double N1;
    private double N2;
    private double N3;
    private double NR;

        //Bilangan pertama
    public void setN1(double N1){
        this.N1 = N1;
    }
    public double getN1(){
        return N1;
    }
    //Bilangan kedua
    public void setN2(double N2){
        this.N2 = N2;
    }
    public double getN2(){
        return N2;
    }
    //Bilangan ketiga
    public void setN3(double N3){
        this.N3 = N3;
    }
    public double getN3(){
        return N3;
    }
        //Nilai Rata2
        public double NR() {
        NR=((Double.valueOf(N1)+Double.valueOf(N2)+Double.valueOf(N3))/3);
        return NR;
        }
        //status   
    public String isStatus(){
        String isStatus = (NR >= 60) ? " :-) " : " :-( ";
        return isStatus;
        }
}

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