CONDITIONAL STATEMENTS
The conditional statements in Java include If
statement, switch statement, Loops statements. The loops are further classified
as for statement, while, do while and for- each statements.
If conditional statement
The syntax of the If loop is:
if (condition 1)
{
Statement 1
}
else if (condition 2)
{
Statement 2
}
else
{
Statement 3
}
In the above syntax, whenever the condition 1 is
satisfied, the statement 1 gets executed. If the condition 2 gets satisfied,
the statement 2 gets executed. If both the condition fails, statement 3 gets executed.
Eg) Consider a vending machine that lends KFC Big 12
bucket when the user lends money greater than 700. Try writing out this code
using If conditional statement in Java.
import java.util.Scanner;
class java {
public static void main(String args[]) {
System.out.println("Hi, Welcome
to KFC");
System.out.println("Enter the
amount you are ready to pay");
int money;
Scanner input=new Scanner(System.in);
money= input.nextInt();
if (money>700)
{
System.out.println("Enjoy your
big 12 bucket :)");
}
else
{
System.out.println("Insufficient
balance");
}
}
}
Output
After If condition, if you are trying to put only one
statement, then you can neglect the curly braces like,
If(condition 1)
Statement 1
However, when more statements are used within the If
condition, it’s necessary to use curly braces.
Switch Statement
In case of ‘If’ statements, when many conditions are
present, the length of the code becomes bigger. Hence, in such cases, ‘switch’
statements can be used to avoid complexity. The ‘switch’ keyword is used while
using ‘Switch’ conditional statements. Within the switch keyword, the input
variable is given. When ‘break’ keyword is used, the compiler stops executing
the other lines else it will start checking other condition also. ‘Default’
keyword is used so that it gets executed when all the condition fails. The
syntax of the switch statement is:
switch(input)
{
case 1:
{
statement 1;
break;
}
case 2:
{
statement 2;
break;
}
default:
statement;
}
Here, input is checked with the case and whenever case
1 is satisfied, statement 1 is executed. Since break keyword is used, the
execution stops. If suppose, case 2 condition is satisfied, statement 2 gets
executed. If neither condition matches, the statement in the default keyword, gets
implemented.
Eg) Consider 3 persons Kalai, Juan and Ash who have
different nick names as Nutella, party monster and Mocacinno. Based on the user’s
input, their nick names must be displayed using switch statements.
import java.util.Scanner;
class java {
public static void main(String args[]) {
System.out.println("Hi, What's your sweet name?");
String name;
Scanner input=new Scanner(System.in);
name= input.next();
switch(name)
{
case "Kalai":
System.out.println("Hey Nutella :)");
break;
case "Juan":
System.out.println("Gorgeous Party monster :)");
break;
case "Ash":
System.out.println("Mocacinno :)");
break;
default:
System.out.println("Have a great day :)"+ name);
break;
}
Output
The input is exactly checked with the case statement.
Even, when we give ‘kalai’, the execution output was the default statement
which proves these are case sensitive.
){kind=link}
0 Comments