The document discusses the if-else conditional statement in Java. It provides 11 examples of using if-else statements to evaluate boolean conditions and execute code blocks accordingly. The if-else statement allows programmers to control program flow based on conditional logic. Key aspects covered include syntax, comparing values, else-if blocks, nesting if statements, and printing outputs before and after the conditional block.

1. if else condition

2. Syntax
if (condition) {
// block of code to be executed if the condition is true
}
eg:-
if(true){
System.out.println("This code executed");
}

3. Example 1
System.out.println("Before if condition");
if(true){
System.out.println("This code executed");
}
System.out.println("After If condition");

4. Example 2
System.out.println("Before if condition");
if(false){
System.out.println("This code not executed");
}
System.out.println("After If condition");

5. Example 3
int number = 10;
System.out.println("Before if condition");
if(number > 0 ){
System.out.println("Positive value found");
}
System.out.println("After If condition");

6. Example 4
int number = -10;
System.out.println("Before if condition");
if(number < 0 ){
System.out.println("Negative value found");
}
System.out.println("After If condition");

7. Example 5
int number = 10;
System.out.println("Before if condition");
if(number == 10 ){
System.out.println("number is equal to 10");
}
System.out.println("After If condition");

8. Example 6
int number = 100;
System.out.println("Before if condition");
if(number != 10 ){
System.out.println("number is not equal to 10");
}
System.out.println("After If condition");

9. Example 7
int number = 100;
System.out.println("Before if condition");
if(number > 10 ){
System.out.println("number is larger than 10");
}else{
System.out.println("number is less than 10");
}
System.out.println("After If condition");

10. Example 8
int x = 30;
if( x == 10 ) {
System.out.print("Value of X is 10");
}else if( x == 20 ) {
System.out.print("Value of X is 20");
}else if( x == 30 ) {
System.out.print("Value of X is 30");
}else {
System.out.print("This is else statement");
}

11. Example 9
int number = 10;
System.out.println("Before if condition");
if(number != 10 ){
System.out.println("number is not equal to 10");
}else{
System.out.println("number is equal to 10");
}
System.out.println("After If condition");

12. Example 10
int number = 100;
System.out.println("Before if condition");
if(number > 10 ){
System.out.println("number is larger than 10");
}else if(number >50){
System.out.println("number is larger than 50");
}else{
System.out.println("number is smaller than 10");
}
System.out.println("After If condition");

13. In Class Activity
●Develop the code to check following conditions
●if number is larger than 50 no need to check is that larger than 10
●if the number is between 10 and 50 then application should print "Number
is larger than 10 and less than 50"

14. Example 11
int number = 100;
System.out.println("Before if condition");
if(number > 10 ){
System.out.println("number is larger than 10");
if(number >50){
System.out.println("number is larger than 50");
}
else{
System.out.println("number is smaller than 10");
}
System.out.println("After If condition");

15. In class Activity
Compress the above code

16. Quiz

18. References
• https://docs.oracle.com/javase/tutorial/java/nutsandbolts/if.html

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