TUGAS CLASS BANGUN DATAR PADA JAVA NETBEAN

main class

 /*  
  * To change this license header, choose License Headers in Project Properties.  
  * To change this template file, choose Tools | Templates  
  * and open the template in the editor.  
  */  
 package tugasclass;  
 import java.util.Scanner;  
 /**  
  *  
  * @author xXbStarXx  
  */  
 public class Tugasclass {  
 Scanner input=new Scanner(System.in);  
   int pil;  
   double ss, jr2, als, tggi, ls, p, l;  
   public int pil(){  
     if(pil==1){  
     System.out.print("input nilai ss= ");  
     ss=input.nextDouble();  
     classpersegi prsg =new classpersegi(ss);  
     System.out.println("ls persegi = "+ prsg.getLuas());  
   }else if(pil==2){  
     System.out.print("input nilai jari-jari = ");  
     jr2=input.nextDouble();  
     classlingkaran lngkrn=new classlingkaran(jr2);  
     System.out.println("ls lingkaran = "+lngkrn.getLuas());  
   }else if(pil==3){  
     System.out.print("input nilai als = ");  
     als=input.nextDouble();  
     System.out.print("input nilai tggi = ");  
     tggi=input.nextDouble();  
     classsegitiga sgtg=new classsegitiga(als, tggi);  
     System.out.println("ls segitiga = "+sgtg.getLuas());  
   }  
   else {  
     System.out.print("input nilai panjang = ");  
     p=input.nextDouble();  
     System.out.print("input nilai lebar = ");  
     l=input.nextDouble();  
     classpersegipanjang perjang=new classpersegipanjang(p, l);  
     System.out.println("Luas Persegi Panjang = "+perjang.getLuas());  
   }  
   return pil;  
   }  
   public static void main(String[] args) {  
     Tugasclass BD=new Tugasclass();  
     Scanner input=new Scanner(System.in);  
     System.out.println("bangun datar"+ "\n++++++++++++++++++");  
   System.out.println("1.Persegi\n2.Lingkaran\n3.Segitiga\n4.Persegi Panjang\nPilih Bangun Datar");    
   BD.pil=input.nextInt();  
     BD.pil();  
   }  
 }  

hasilnya

 coding rumus persegi

 /*  
  * To change this license header, choose License Headers in Project Properties.  
  * To change this template file, choose Tools | Templates  
  * and open the template in the editor.  
  */  
 package tugasclass;  
 /**  
  *  
  * @author xXbStarXx  
  */  
 public class classpersegi {  
   double ss;  
   public classpersegi(double ss){  
     this.ss = ss;  
   }  
   public double getLuas(){  
   double ls;  
   ls=ss*ss;  
   return ls;  
   }  
 }  

hasilnya

 coding hasil lingkaran

 /*  
  * To change this license header, choose License Headers in Project Properties.  
  * To change this template file, choose Tools | Templates  
  * and open the template in the editor.  
  */  
 package tugasclass;  
 /**  
  *  
  * @author xXbStarXx  
  */  
 public class classlingkaran {  
  double jr2;  
   public classlingkaran(double jr2){  
     this.jr2=jr2;  
   }  
   public double getLuas(){  
   double ls;  
   ls=3.14*(jr2*jr2);  
   return ls;  
   }  
 }  

hasilnya

koding segitiga

 /*  
  * To change this license header, choose License Headers in Project Properties.  
  * To change this template file, choose Tools | Templates  
  * and open the template in the editor.  
  */  
 package tugasclass;  
 /**  
  *  
  * @author xXbStarXx  
  */  
 public class classsegitiga {  
  double als, tggi;  
   public classsegitiga(double als, double tggi){  
     this.als = als;  
     this.tggi = tggi;  
   }  
   public double getLuas(){  
   double ls;  
   ls=(0.5*als)*tggi;  
   return ls;  
   }  
 }  

hasilnya

koding persegi panjang

 /*  
  * To change this license header, choose License Headers in Project Properties.  
  * To change this template file, choose Tools | Templates  
  * and open the template in the editor.  
  */  
 package tugasclass;  
 /**  
  *  
  * @author xXbStarXx  
  */  
 public class classpersegipanjang {  
 double p, l;  
   public classpersegipanjang(double p, double l){  
     this.p = p;  
     this.l = l;  
   }  
   public double getLuas(){  
   double ls;  
   ls=p*l;  
   return ls;  
   }  
 }  

hasilnya

sekian terima kasih semoga bermanfaat