Skip to main content

Loops

Loops:-Loops are used for iterating similar statements for multiple times.
Types:-
1.     For loop
2.     While loop
3.     Do-while loop
4.     For-each loop
For loop:-
Syntax of for loop:-
for(initialization;condition;counter)
Statement1;
for(initialization;condition;counter)
{
Statement1;
Statement1;
}
For loop must contain two semicolons inside parenthesis. for loop contains three parts inside parenthesis first part contain initialization ,second part contain condition and third part contain counterpart. control first go for initialization then go for condition if the given condition is true then go for body execution after that control go for counter then again go for condition if condition is true then repeated and so on.  
Example1:-TestLoop.java
class TestLoop
{
public static void main(String[]args)
{
int i;
System.out.println("Demo of for loop");
for(i=1;i<=10;i++)
System.out.println("i :"+i);
}
}
Output:-it will print 1 to 10.

Example2:-TestLoop.java
class TestLoop
{
public static void main(String[]args)
{
int i;
System.out.println("Demo of for loop");
for(i=1;i<=10;++i)
System.out.println("i :"+i);
}
}
Output:-it will print 1 to 10.
Example3:-TestLoop.java
class TestLoop
{
public static void main(String[]args)
{
System.out.println("Demo of for loop");
int i=1;
for(;i<=10;)
System.out.println("i :"+(i++));
}
}
Output:-Output:-it will print 1 to 10.
Example4:-TestLoop.java
class TestLoop
{
public static void main(String[]args)
{
System.out.println("Demo of for loop");
for(int i=1;i<=10;i++)
{
System.out.println("i :"+i);
}
}
}
Output:-print 1 to 10.
Example5:-
class TestLoop
{
public static void main(String[]args)
{
System.out.println("Demo of for loop");
for(int i=1;i<=10;i++)
{
if(i%2==0)
System.out.println("i :"+i);
}
}
}
Output:-all even number between 1 to 10

While Loop:-while loop is very similar to for loop.
Syntax:-            
Initialization;
While(condition)
{
Statements;
Counter;
}
Loop will execute if condition is true.

Example1:-TestLoop.java
class TestLoop
{
public static void main(String[]args)
{
System.out.println("Demo of while loop");
int i=1;
while(i<=10)
System.out.println("i :"+(i++));
}
}
Output:-print 1 to 10.
Example2:-TestLoop.java
class TestLoop
{
public static void main(String[]args)
{
System.out.println("Demo of while loop");
int i=1;
while(i<=10)
{
System.out.println("i :"+i);
i++;//++i output will be same
}
}
}
Output:-print 1 to 10.
Example3:-TestLoop.java
class TestLoop
{
public static void main(String[]args)
{
System.out.println("Demo of while loop");
int i=1;
while(i<=10)
{
if(i%2!=0)
System.out.println("i :"+i);
i++;//++i output will be same
}
}
}
Output:-print odd number b/w 1 to 10.

do-while loop:-do while loop is different from for and while loop, both for and while loop are entry controlled where do-while loop is exit controlled loop that means loop can execute once if condition is false.
Syntax:-
Initialization;
do
{
Statements;
Counter;
}while(condition);

Example1:-TestLoop.java
class TestLoop
{
public static void main(String[]args)
{
System.out.println("Demo of do-while loop");
int i=1;
do
{
System.out.println("i :"+i);
i++;//++i output will be same
}while(i<=10);
}
}
Output:-print 1 to 10.
Example2:-TestLoop.java
class TestLoop
{
public static void main(String[]args)
{
System.out.println("Demo of do-while loop");
int i=1;
do
{
if(i%2==0)
System.out.println("i :"+i);
i++;//++i output will be same
}while(i<=10);
}
}

Output:-print even number b/w 1 to 10.
Labels:

Comments

Post a Comment

Popular posts from this blog

Inheritance-4

Example10:- class Student { Student() { System.out.println("This is super class Zero argument constructor"); } Student(String s) { System.out.println("This is super class One argument constructor"); } } class Test extends Student { Test() { super(null); System.out.println("This is sub class Zero argument constructor"); } public static void main(String[]args) { Test t=new Test(); } } Output:- C:\JAVATECH>javac Test.java C:\JAVATECH>java Test This is super class One argument constructor This is sub class Zero argument constructor Example11:- class Student { Student() { System.out.println("This is super class Zero argument constructor"); } Student(String s) { System.out.println("This is super class One argument constructor"); } } class Test extends Student { Test() { super(); super(null); System.out.println("This is su...
Post a Comment
Read more

Regarding class files

Class files:- Regarding class file or dot class file also known as byte code of class, in a java programming language we can use any number of classes in our program. After compilation all classes convert into individual   .class   file. Example:- class A { } class B { } class C { } class Student { public static void main(String[]args) { System.out.println("Well-come to my java blog"); } } We can save above program to any   classname.java   or we can use any other   name.java,   there is no compulsion for java file name. But recommended to save by that class name which having main method. I saved the above file to   Student.java   name .   Before compilation my   C:\JAVATECH   folder contain only one java file. Student.java For  compilation. C:\JAVATECH>javac  Student.java After compilation   my   C:\JAVATECH   folder contains five files, on...
Post a Comment
Read more

inheritance

INHERITANCE:- Inheritance is the process of code re-usability, using this property software or applications can develop in less time or can develop rapidly. Inheritance increases the readability of code and decrease redundancy or repetition of code or reduces size of code. Use of previously developed code in future any number of times is called inheritance. Through inheritance variables and methods of class can inherited. Types of Inheritance:- 1)         Single or Single level inheritance 2)         Multilevel inheritance 3)         Hierarchical inheritance Java does not support to multiple inheritance. Single or single level inheritance:- In a single inheritance a class is inherited by a single class. In a single or single level inheritance a sub class having only one super class directly or indirectly. Syntax: -        class Subclass ex...
Post a Comment
Read more