Conditonal Statements

Conditional Statements

By using the Conditional Statements we can easily control the flow of the program.

  1. if statement                
  2. if - else statement            
  3. Nested if statement 
  4. if else if ladder
  5. switch statement

1) if statement:
  • It executes the set of code / block when the given condition is true.
  • It doesn't execute the block when the given condition is false.
Syntax:

if(condition){
//statements to be execute when the given condition is true
}


2) if - else statement:
  • It is used to execute the different block of code alternatively.
  • It is similar to if statement.
  • If the condition is matched/true then if block statements will executes.
  • If the condition is not matched/false then else block statements will executes.
  • else is a extension of if statement.
  • Without if we cannot use else statement.
Syntax:

if(condition){
//statements when condition is true
}else{
//statements when condition is false
}


3) Nested if statement:
  • It is used to check the 2 or more if conditions.
  • Here we write if / if-else statements inside a another if / if-else statement.
Syntax:

if(condition1){
//statements executes when condition1 is true

  if(condition2){
//statements executes when both condition1and2 are true

if(conditon3){
//statements executes when condition1,2and3 are true
}

}else{
//statements executes when condition2 is false
}

}


4) if-else Ladder:
  • It is used to check the 2 or more if -else conditions alternatively.
  • When any one of the if condition is satisfied then remaining conditions of if block will not be checked even though there is a matching if block condition is available.
  • When there is no if block condition is true then it executes the else block.
Syntax:

if(condition1){
//executes when condition1 is true
}else if(condition2){
//executes when condition2 is true and condition1 is false
}else if(condition3){
//executes only when conditon3 is true and conditon 1,2 is false
}else{
//executes when all conditions are false
}


5) switch statement:
  • It executes only when given expression is exactly equal to case values.
  • When there is no matching case is available then it executes default case.
  • When there is a matching case available it executes all cases statements from the matching case.
  • To over come the above problem we use break keyword at the end of each case statement.

Syntax:

switch(expression){

case value1:
statements;
break;
case value2:
statements;
break;
case value3:
statements;
break;
//upto n cases 
default:
statements;

}


Location: Madanapalle, Andhra Pradesh, India

Comments

Post a Comment

Popular posts from this blog

Constructors in java

 Java Constructors Constructor is nothing but a method with a class name It doesn't return any values  We don't write any return type of the constructor It is used to initialise the values when the object is created In java there is constructor called default constructor it is automatically initialize when there is no constructor is assigned We can also give parameters in the constructor so at the time of initialize we can assign some value into the class. It is known as parametric construction If we create a any constructor in a class then the default constructor will not work so we need to write the default constructor also if we want to use them Ex: 1) Default constructor class Hello{ public int a=10; public int b=20; } class Hel{ public static void main (String []args){ Hello h=new Hello();// using default constructor  System.out.print(h.a+h.b);//1020 } 2) Constructor with no parameters   class Hello{ public Hello(){ System.out.print("Hello"); } } class Hel{ publi
Read more