Arrays in Java

• Array is a same as a variable.
• This is add more then one value at a time.

Syntax:-
int[] myintarray={};
{
}

---

Example:-
public class MyClass
{
public static void main(string[] arg)
{
int[]Myintarray={1,2,3,4,5}
//int myintarray[]={1,2,3,4,5}
{
System.out.println(3);
}
}
}

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Loop Structure in java

Loops :

A loop statement allows us to execute a statement or group of statements multiple times and following is the general form of a loop statement in most of the programming languages.

 

1. While loop :- Repeats a statement or group of statements while a given condition is true. It tests the condition before executing the loop body.

 

Syntax :

 

while (boolean condition)

{

// loop statement.....

}

 

 

Example :

 

Class Technogeeks

{

public static void main(String arg[])

{

int x=1;

while (x<=4)

{

System.out.println("Value of x is" +x);

x++;

}

}

}

 

2. do While loop :- Like a while statement, except that it tests the condition at the end of the loop body.

 

Syntax :

 

do

{

   // Ststements......

}

while (condition);

 

 

Example :

 

class Technogeeks

{

public static void main(String args[])

{

int x = 21;

do

{

System.out.println("Value of x is" +x);

x++;

}

while (x<20);

}

}

 

3. For loop :- Execute a sequence of statements multiple times and abbreviates the code that manages the loop variable.

 

Syntax :

 

for(initialization condition; texting condition ; increment/decrement)

{

//Statements

}

 

Example :

 

Class Technogeeks

{

public static void main (String args[])

{

for(int x=2; x<=4; x++)

System.out.println("Value of x is " +x);

}

}

 

 

Infinite Loop

 

Example :

 

public class Technogeeks

{

public static void main(String[] args)

{

for(int i=5; i!=0; i -=2)

{

System.out.println(i);

}

int x=5;

While(x==5)

{

System.out.println("In the loop");

}

}

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Switch Statement

 We will explain a Switch statement is —

The syntax of switch case is : 

Syntax:-
switch()
{
case1:
statement()
break;
case2:
statement()
break;
default:
statement()
break;
}

---

Example:-
public class MyClass
{
public static void main(string[] arg)
{
int score=90;
switch(score)
{
Case 90:
System.out println(“Very good”);
break;
Case 60:
System.out println(“Good”);
break;
Case 40:
System.out println(“OK”);
break;
default:
System.out println(“The grade is not valid”);
}
}
}

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Logical Operator

In logical operator there are two operator

"&&" This is called as AND operator.
 "||" This is called as OR operator.

Example:-
public Class MyClass
{
public static void main(string[] arg)
{
int sub1=50;
int sub2=30;
if((sub1>=35)&&(sub2>=25))||((sub1<=60)&&(sub2<=40))
{
System.out.println(“The condition is true”);
}
else
{
System.out.println(“The condition is false”);
}
}
}

Here, perform a Logical operator.

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Conditional Operator ( if-else Statement)

Condition: if statement is used to test the condition. It checks boolean condition: true or false. There are various types of if statement in Java.

   If Statement

 

Syntax :

   If(condition)

{

//Statement     OR     code to be executed

}

 

Example :

 

Public class ifExample

{

Public static void main(String[] args)

{

Int age =20;

If(age>18)

{

System.out.println(“Age is greater than 18”);

}

}

}

 

2.    If-else Statement

 

Syntax :

If(condition)

{

//code if condition is true

}

Else

{

// code if condition is false

}

 

               Example :

Public classs ifElseExample

{

Public static void main(String [] args)

{

Int number = 13;

If(number%2==0)

{

System.out.println(“even number”);

}

Else

{

System.out.println(“odd number”);

}

}

}

 Leap Year

A year is leap, if it is divisible by 4 and 400. But, not by 100.

Public class leapyear

{

Public static void main(String[] args)

{

Int year =2020;

If(year%4==0) && (year%100!=0) || (year% 400==0)

{

System.out.println(“LEAP YEAR”);

}

Else

{

System.out.println(“COMMON YEAR”);

}

}

}

 

3.    If-else-if   : The if-else-if ladder statement executes one condition from multiple statements.

Syntax :

If(condition)

{

//code to be executed if condition1 is true

}

Else if(condition)

{

//code to be executed if condition2 is true

}

Else

{

//code to executed if all condition are false

}

Example :

Public class ifelseifexample{

Public static void main(String[] args){

Int marks =65;

If(marks<50){

System.out.println(“Fail”);

}

Elseif(marks>=60 && marks<70){

System.out.println(“D grade”)

}

Elseif(marks>=70 && marks<80){

System.out.println(“B grade”);

} Elseif(marks>=80 && marks<90){

System.out.println(“c grade”);

}else{

System.out.println(“Invaild”);

}

}

}

 

WRP to check positive, negative and zero?

 

Public class positivenegative

{

Public static void main(String[] args)

{

Int number = -15;

If(number>0)

{

System.out.println(“POSITIVE”);

}

Elseif(number<0)

{

System.out.println(“NEGATIVE”);

}

Else{

System.out.println(“ZERO”);

}

}

}

 

4.    Nested if Statement

Syntax :

If(condition){

//code to executed

}

If(condition){

//code to be excuted

}

Example :

 

Publiuc class nestedif{

Public static void main(Strings[] args)

{

Int age=20;

Int weight=80;

If(age>=18){

If(weight>50)

{

System.out.println(“Your are eligible to donate blood”);

}

}

}

}

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Assignment operator (Post increment and Pre increment)

Post increment

int x=10;
x=x+1;
System.out.println(“x”);
 ————————————->>>>Output     :-11

---

int x=10;
x++;                          //increment by one.
System.out.println(“x”);
—————————————->>>>Output   :-11

---

int x=10;
System.out.println(“x++”);     //Here,first print the x value then, increment by one.
—————————————–>>>> Output :-10

---

• Pre increment

int x=10;
System.out.println(“++x”);   //Here,first increment the value of  x then print x.
———————————>>>Output :-  11

---

int x=10;
++x;                          //First increment by one the Print the value.
System.out.println(“x”);
—————————————->>>>Output   :-  11

---

Finally, In this slide we show a assignment operator.

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Take a input by user

Take the input from user

Syntax:-
Scanner scan=new Scanner(System.in);

Example:-

*/ Package lesson1;
import java until.scanner;
public class Myclass
{
public static void main(string[] arg);
{
Scanner scan=new Scanner(System.in);
System.out.println(“Enter the some number”);
int user-input-number=scan.nextInt();
System.out.println(“The enter value is-“);
System.out.println(“user-input-number”);
}
}
*/

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