luas, Java - rextester

luas

//'main' method must be in a class 'Rextester'.
//openjdk version '11.0.5'

import java.util.*;
import java.lang.*;

//Auth : Praditya Lutvi Charisma
class Rextester{  
    
    public static void main(String args[])
    {
        Lingkaran lingkaran = new Lingkaran(14);
        PersegiPanjang persegiPanjang = new PersegiPanjang(6,10);
        Segitiga segitiga = new Segitiga(12,16);
        
        System.out.println("1. Lingkaran");
        System.out.println("Jari Jari :"+lingkaran.getJariJari());
        System.out.printf("Luas : \t%.2f \n",lingkaran.getLuas());
        System.out.println();
        System.out.println("2. Persegi Panjang");
        System.out.println("Panjang :"+persegiPanjang.getPanjang());
        System.out.println("Lebar :"+persegiPanjang.getLebar());
        System.out.println("Luas : \t "+persegiPanjang.getLuas());
        System.out.println();
        System.out.println("3. Segitiga");
        System.out.println("Alas :"+segitiga.getAlas());
        System.out.println("Tinggi :"+segitiga.getTinggi());
        System.out.println("Luas : \t "+segitiga.getLuas());
    }
}

class Lingkaran{
    double jariJari;
    public Lingkaran(){
        jariJari = 0;
    }
    public Lingkaran(double jariJari){
        this.jariJari = jariJari;
    }

public double getJariJari() {
        return jariJari;
    }

public void setJariJari(double jariJari) {
        this.jariJari = jariJari;
    }
    public double getLuas(){
        double luas=0;
        luas = Math.PI * jariJari * jariJari;
        return luas;
    }
}

class PersegiPanjang{
    double panjang, lebar;

public PersegiPanjang() {
        panjang = 0;
        lebar = 0;
    }
    public PersegiPanjang(double panjang, double lebar) {
        this.panjang = panjang;
        this.lebar = lebar;
    }

public double getPanjang() {
        return panjang;
    }

public void setPanjang(double panjang) {
        this.panjang = panjang;
    }

public double getLebar() {
        return lebar;
    }

public void setLebar(double lebar) {
        this.lebar = lebar;
    }
    public double getLuas(){
        double luas=0;
        luas = panjang * lebar;
        return luas;
    }
}

class Segitiga{
    double alas, tinggi;

public Segitiga() {
        alas =0;
        tinggi=0;
    }

public Segitiga(double alas, double tinggi) {
        this.alas = alas;
        this.tinggi = tinggi;
    }

public double getAlas() {
        return alas;
    }

public void setAlas(double alas) {
        this.alas = alas;
    }

public double getTinggi() {
        return tinggi;
    }

public void setTinggi(double tinggi) {
        this.tinggi = tinggi;
    }
    public double getLuas(){
        double luas =0;
        luas = 0.5 * alas * tinggi;
        return luas;
    }
}


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