if,if else..,nested if statement:

1.Java if statement:

The if statement is the most simple decision-making statement. It is used to decide whether a certain statement or block of statements will be executed or not i.e. if a certain condition is true then a block of statements is executed otherwise not.

Syntax:

if(condition)  { 

  // Statements to execute if   

 // condition is true 


}

Flowchart:

Example:

public class Demo
{
  public static void main(String args[])
   {
    int i = 10;
    if (i < 15)
        System.out.println("10 is less than 15");
   }
}
output:10 is less than 15

2.Java if else statement:

The if-else statement helps you to run a specific block of a program if the condition is true or else, it will check other conditions.

Syntax:

If(condition){

// code if condition is true

}else{

//code if condition is false

}

Flowchart:

Example:

public class Age
{
public static void main(String args[])
{

int age=21;
if(age>22)
{
System.out.println("Idhaya's age is 21");
}
else
{
System.out.println("Ilakkiya's age is 21");
}
}
}
output:Ilakkiya's age is 21

3.Java Nested if statement:

Nested if in Java refers to having one if statement inside another if statement. If the outer condition is true the inner conditions are checked and executed accordingly.

Syntax:

if (condition1) {

    if (condition2) {

        if (condition3) {

            // statements;


     }
   }
 }

Flowchart:

Example:
public class Equal
{
public static void main(String args[])
{
int a = 10;
int b = 20;
if (a == 10)
{
if (b == 20)

{
System.out.println("satisfied");
}
}
}
}
output:satisfied

TASK:
1.#Java program for if statement:

public class Mark
{
public static void main(String args[])
{
int mark=50;
if(mark>35)
System.out.println("passed");
}
}
output: passed

python program for if statement:

mark=50
if(mark>35):
print("passed")
Output: passed

2.#Java program for if else statement:

public class Fruit
{

public static void main(String args[])
{
int orange=100;
if(orange>200)
{
System.out.println("will not buy");
}
else
{
System.out.println("will buy oranges");
}
}
}
Output: will buy oranges

python program for if else statement:

orange=100
if(orange>200):
print("will not buy")
else:
print("will buy oranges")
Output:
will buy oranges

Java program for nested if statement:

public class Calculate
{
public static void main(String args[])
{
int a = 10;
int b = 20;
if (a==10)
{
if (b>10)
{
System.out.println("true");
}
else
{
System.out.println("false");
}
}
}
}

output:true

python program for nested if statement:

a = 10
b = 20
if a == 10:
if b > 10:
print("true")
else:
print("false")

output:true