if super or this are called, they can only be called on the first line of the constructor
an exception can be thrown if a parameter is invalid
you should ensure that the constructed object is in a valid state
constructors should never call an overridable method (an overridable method is one which is neither private, static, nor final)
constructors...
Tuesday, September 11, 2018
Monday, January 11, 2016
Method Overloading or Method Overriding
OverridingDemo.java
class Parent
{
public void show(int... i)
{
System.out.println("parent");
}
}
class Child extends Parent
{
public void show(int[] i)
{
System.out.println("child");
}
}
public class OverridingDemo
{
public static void main(String[] args)
{
Child c = new Child();
int arr[]=new int[]{2,3};
c.show(arr);//child
...
Reverse Number Java Example
import java.util.Scanner;
class ReverseNumber
{
public static void main(String[] args)
{
int no,rev=0,r,a;
Scanner s=new Scanner(System.in);
System.out.println("Enter any no.: ");
no=s.nextInt();
a=no;
while(no>0)
{
r=no%10;
rev=rev*10+r;
no=no/10;
}
System.out.println("Reverse: "+rev);
}
}
Enter any no. :
153
Reverse: 35...
Thursday, January 7, 2016
Best 5 Books For Learning Java
1. SCJP Sun Certified Programmer for Java 6
Author : Bert Bates / Kathy Sierra
Description :
This book is perfect if you are preparing for Java Certification Exam or preparing for interviews or wants to master in Core Java.
2 .The Java Language Specification, Third Edition
Author :James...
String Reverse Java Program
public class StringReverseExample
{
public static void main(String[] args)
{
String string="abcdef";
String reverse=new StringBuffer(string).reverse().toString();
System.out.println("\nString before reverse:"+string);
System.out.println("\nString after reverse:"+reverse);
}
}
Result:
String before reverse:abcdef
String after reverse:fedcb...
