Abstract Keyword

6. Program

// Find what it gives Compiletion Error / Compiletion Successfully / Output ? 
abstract class H
{
 abstract void test1();
 abstract void test2();
 abstract void test3();
}

class I extends H
{
 void test1()
 {
  System.out.println("From test1");
 }
 
 void test2()
 {
  System.out.println("From test1");
 }
 
 void test3()
 {
  System.out.println("From test3");
 }
 
 public static void main(String[] args)
 {
  // H h1 = new H();
   I obj1 = new I();
   obj1.test1();
   obj1.test2();
   obj1.test3();
   
  System.out.println("Done");    
 }
} 

---

7. Program

// Find what it gives Compiletion Error / Compiletion Successfully / Output ? 
abstract class J
{
 abstract void test1();
 abstract void test2();
 void test3()
 {
  System.out.println("From test3");
 }
 
}

abstract class K extends J
{
 void test1()
 {
  System.out.println("From test1");
 }
}

// Imp Program
class L extends K
{
 void test2()
 {
  System.out.println("From test2");  
 }
  
 public static void main (String[] args) 
 {
  L l1 = new L();
  l1.test1();
  l1.test2();
  l1.test3();
  System.out.println("Done");
 }
 
}

---

8. Program

// Find what it gives Compiletion Error / Compiletion Successfully / Output ? 
abstract class K
{
 abstract void method1();
 abstract void method2();
 abstract void method3();
 abstract void method4();
 
}

abstract class L extends K
{
 void method1()
 {
  System.out.println("From method1");
 }
 
 abstract void method5();
}

class M extends L
{
 void method2()
 {
  System.out.println("From method2");  
 }
 
 void method3()
 {
  System.out.println("From method3");  
 }

 void method4()
 {
  System.out.println("From method4");  
 }
 
 void method5()
 {
  System.out.println("From method5");  
 }
 public static void main (String[] args) 
 {
  M m1 = new M();
  m1.method1();
  m1.method2();
  m1.method3();
  m1.method4();
  m1.method5();
  System.out.println("Done");
 }
 
}

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