Object and Classes

OBJECT AND CLASSES

Kali ini saya akan membuat class beberapa bangun 2D beserta testMain nya. Lihat beberapa contoh berikut ini :

1. Bujur Sangkar

 public class BujurSangkar  
 {  
   public double s; //sisi dari persegi  
   //Methods to return circumference and area  
   public double circumference(){  
     return 4*s;  
   }  
   public double area () {  
     return s*s;  
   }  
 }  

2. Segitiga Siku-Siku

 public class SegitigaSikuSiku  
 {  
   public double a; //alas dari segitiga siku-siku  
   public double t; //tinggi dari segitiga siku-siku  
   public double sm; //sisi miring dari segitiga siku-siku  
   //Methods to return circumference and area  
   public double circumference(){  
     return a+t+sm;  
   }  
   public double area () {  
     return 0.5*a*t;  
   }  
 }  

3. Persegi Panjang

 public class PersegiPanjang  
 {  
   public double p; //panjang dari persegi panjang  
   public double l; //lebar dari persegi panjang  
   //Methods to return circumference and area  
   public double circumference(){  
     return (2*p)+(2*l);  
   }  
   public double area () {  
     return p*l;  
   }  
 }  

4. Belah Ketupat

 public class BelahKetupat  
 {  
   public double d; //Diameter dari belah ketpat  
   public double s; //Sisi dari belah ketupat  
   //Methods to return circumference and area  
   public double circumference(){  
     return 4*s;  
   }  
   public double area () {  
     return 0.5*d*d;  
   }  
 }  

5. Jajaran Genjang

 public class JajaranGenjang  
 {  
   public double a; //alas dari jajaran genjang  
   public double t; //tinggi dari jajaran genjang  
   public double sm; //sisi miring dari jajaran genjang  
   //Methods to return circumference and area  
   public double circumference(){  
     return (2*a)+(2*sm);  
   }  
   public double area () {  
     return a*t;  
   }  
 }  

6. TestMain

 class MyMain  
 {  
   public static void main(String args[])  
     {  
       BujurSangkar aBujur; //creating reference  
       aBujur = new BujurSangkar(); //creating object  
       aBujur.s = 5; //assigning value to data field  
       double area = aBujur.area(); //invoking method  
       double circumf = aBujur.circumference();  
       System.out.println("Square");  
       System.out.println("Sisi="+aBujur.s+" Area="+area);  
       System.out.println("Sisi="+aBujur.s+" Circumference="+circumf);  
       System.out.println("\n");  
       SegitigaSikuSiku aSegitiga; //creating reference  
       aSegitiga = new SegitigaSikuSiku(); //creating object  
       aSegitiga.a = 5; //assigning value to data field  
       aSegitiga.t = 12;  
       aSegitiga.sm = 13;  
       double area1 = aSegitiga.area(); //invoking method  
       double circumf1 = aSegitiga.circumference();  
       System.out.println("Right Triangle");  
       System.out.println("Alas="+aSegitiga.a+" Tinggi ="+aSegitiga.t+" Area="+area1);  
       System.out.println("Alas="+aSegitiga.a+" Tinggi ="+aSegitiga.t+" Sisi Miring ="+aSegitiga.sm+" Circumference="+circumf1);  
       System.out.println("\n");  
       PersegiPanjang aPerpan; //creating reference  
       aPerpan = new PersegiPanjang(); //creating object  
       aPerpan.p = 3; //assigning value to data field  
       aPerpan.l = 10;  
       double area2 = aPerpan.area(); //invoking method  
       double circumf2 = aPerpan.circumference();  
       System.out.println("Rectangle");  
       System.out.println("Panjang="+aPerpan.p+" Lebar="+aPerpan.l+" Area="+area2);  
       System.out.println("Panjang="+aPerpan.p+" Lebar="+aPerpan.l+" Circumference="+circumf2);  
       System.out.println("\n");  
       BelahKetupat aBelah; //creating reference  
       aBelah = new BelahKetupat(); //creating object  
       aBelah.d = 10; //assigning value to data field  
       aBelah.s = 7.07;  
       double area3 = aBelah.area(); //invoking method  
       double circumf3 = aBelah.circumference();  
       System.out.println("Rhombus");  
       System.out.println("Diagonal="+aBelah.d+" Area="+area3);  
       System.out.println("Diagonal="+aBelah.d+" Sisi="+aBelah.s+" Circumference="+circumf3);  
       System.out.println("\n");  
       JajaranGenjang aJajar; //creating reference  
       aJajar = new JajaranGenjang(); //creating object  
       aJajar.a = 9; //assigning value to data field  
       aJajar.t = 4;  
       aJajar.sm = 5;  
       double area4 = aJajar.area(); //invoking method  
       double circumf4 = aBelah.circumference();  
       System.out.println("Parallelogram");  
       System.out.println("Alas="+aJajar.a+" Tinggi="+aJajar.t+" Area="+area4);  
       System.out.println("Alas="+aJajar.a+" Sisi miring="+aJajar.sm+" Circumference="+circumf4);  
       System.out.println("\n");  
     }  
 }  

7. Hasil

Begitulah prosesnya, semoga bermanfaat!