Java(Access Modifiers)

Sep 17, 2014Download as pptx, pdf2 likes662 views

Private(Class Access) Public(Global Access) Default(Package Level Access) Protected(Inside the same Package and in the outside package we can access but based on only inhertance relationship )

 Final
 Synchronized
 Abstract
 static

 The final keyword prevents a method from being overridden
in a subclass
class SuperClass{
public final void showSample()
{
System.out.println("One thing.");
}
}
class SubClass extends SuperClass{
public void showSample()
{
// Try to override the final
// superclass method
System.out.println("Another thing.");
}
}

class Bank
{
int accountBalance ;
public Bank(){
accountbalance = 10000;
}
Synchronized void BalanceInquiry(){
System.out.println(“account
balance is :”+accountbalance);
}
}

abstract class Hotel
{
public void Idli(){
System.out.println(“Prepare Idli”);
}
abstract public void Dosa();
}

class Pageview
{
public static final int count = 0;
public Pageview()
{
count++;
System.out.println(“Number of views
to website”+count);
}
public static void main(String args[])
{
Pageview p = new Pageview();
}
}

 Arithmetic Operators
 Relational Operators
 Bitwise Operators
 Logical Operators
 Assignment Operators

 Bitwise operator works on bits and performs bit-by-bit operation. Assume
if a = 60; and b = 13; now in binary format they will be as follows:
 a = 0011 1100
 b = 0000 1101
 ------------------------------------------------------------------------------------------
 a & b = 0000 1100
 a || b = 0011 1101
 a ^ b = 0011 0001
 ~a = 1100 0011

 Conditional Operators are also called ternary
operator
 This operator consists of three operands.
 It is used to evaluate an expressions
 Syntax:
variable x = (expression) ? value if true : value if
false

public class Test{
public static void main(String args[])
{
int a, b;
a = 10;
b = 20;
( a > b ) ? a : b ;
( a <10 ) ? a : b ;
}
}

 Methods declared public in a superclass also must be public in
all subclasses.
 Methods declared protected in a superclass must either be
protected or public in subclasses; they cannot be private.
 Methods declared without access control (no modifier was
used) can be declared more private in subclasses.
 Methods declared private are not inherited at all, so there is no
rule for them.

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3.  Final  Synchronized  Abstract  static

4.  The final keyword prevents a method from being overridden in a subclass class SuperClass{ public final void showSample() { System.out.println("One thing."); } } class SubClass extends SuperClass{ public void showSample() { // Try to override the final // superclass method System.out.println("Another thing."); } }

5. class Bank { int accountBalance ; public Bank(){ accountbalance = 10000; } Synchronized void BalanceInquiry(){ System.out.println(“account balance is :”+accountbalance); } }

6. abstract class Hotel { public void Idli(){ System.out.println(“Prepare Idli”); } abstract public void Dosa(); }

7. class Pageview { public static final int count = 0; public Pageview() { count++; System.out.println(“Number of views to website”+count); } public static void main(String args[]) { Pageview p = new Pageview(); } }

8.  Arithmetic Operators  Relational Operators  Bitwise Operators  Logical Operators  Assignment Operators

16.  Bitwise operator works on bits and performs bit-by-bit operation. Assume if a = 60; and b = 13; now in binary format they will be as follows:  a = 0011 1100  b = 0000 1101  ------------------------------------------------------------------------------------------  a & b = 0000 1100  a || b = 0011 1101  a ^ b = 0011 0001  ~a = 1100 0011

25.  Conditional Operators are also called ternary operator  This operator consists of three operands.  It is used to evaluate an expressions  Syntax: variable x = (expression) ? value if true : value if false

26. public class Test{ public static void main(String args[]) { int a, b; a = 10; b = 20; ( a > b ) ? a : b ; ( a <10 ) ? a : b ; } }

27.  Methods declared public in a superclass also must be public in all subclasses.  Methods declared protected in a superclass must either be protected or public in subclasses; they cannot be private.  Methods declared without access control (no modifier was used) can be declared more private in subclasses.  Methods declared private are not inherited at all, so there is no rule for them.

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