1) What is the basic syntax of an if-else statement in Java?

The basic syntax of an if-else statement in Java is as follows:

if (condition) {
    // code to be executed if condition is true
} else {
    // code to be executed if condition is false
}

2) How do you check for equality between two variables in a condition in Java?

To check for equality between two variables in a condition in Java, you can use the == operator. Example: if (x == y)

3) How do you check for inequality between two variables in a condition in Java?

To check for inequality between two variables in a condition in Java, you can use the != operator. Example: if (x != y)

4) How do you check if a variable is greater than or less than another variable in a condition in Java?

To check if a variable is greater than or less than another variable in a condition in Java, you can use the > or < operator respectively. Example: if (x > y) or if (x < y)

5) How do you check if a variable is greater than or equal to, or less than or equal to another variable in a condition in Java?

To check if a variable is greater than or equal to, or less than or equal to another variable in a condition in Java, you can use the >= or <= operator respectively. Example: if (x >= y) or if (x <= y)

6) How can you check if a variable is equal to multiple values in an if-else statement in Java?

You can use multiple if-else statements or you can use logical operator OR(||) between different conditions. Example: if (x == 1 || x == 2 || x == 3)

7) How can you check if a variable is not equal to multiple values in an if-else statement in Java?

you can use logical operator AND (&&) between different conditions with negation. Example: if (!(x == 1 || x == 2 || x == 3))

8) How do you use an if-else statement inside another if-else statement in Java?

You can use an if-else statement inside another if-else statement by placing the inner if-else statement within the block of the outer if-else statement.

9) How do you use the ternary operator in an if-else statement in Java?

The ternary operator in Java is a shorthand way of writing an if-else statement. The syntax is: (condition) ? expression1 : expression2. If the condition is true, the ternary operator returns expression1, otherwise it returns expression2.

10) How do you use a switch statement in place of an if-else statement in Java?

A switch statement in Java can be used in place of an if-else statement when you need to check a variable against multiple cases. The basic syntax is:

switch (variable) {
    case value1:
        // code to be executed if variable is value1
        break;
    case value2:
        // code to be executed if variable is value2
        break;
    default:
        // code to be executed if variable is none of the above
}

11) How do you use a nested if condition?

A nested if statement in Java is an if statement that is placed within the block of another if statement. The syntax is:

if (condition1) {
    // code to be executed if condition1 is true
    if (condition2) {
        // code to be executed if condition2 is true
    }
}

12) How do you use the logical operators AND (&&) and OR (||) in an if-else statement in Java?

The logical AND operator (&&) is used to check if both conditions are true, and the logical OR operator (||) is used to check if at least one condition is true. Example: if (condition1 && condition2) or if (condition1 || condition2)

13) How do you use the logical NOT operator (!) in an if-else statement in Java?

The logical NOT operator (!) is used to negate a condition, making it the opposite of its original state. Example: if (!condition)

14) How do you check if a variable is equal to null in an if-else statement in Java?

To check if a variable is equal to null in an if-else statement in Java, you can use the == operator. Example: if (variable == null)

15) How do you check if a variable is not equal to null in an if-else statement in Java?

To check if a variable is not equal to null in an if-else statement in Java, you can use the != operator. Example: if (variable != null)

16) How do you use the break statement in a switch statement in Java?

The break statement is used inside a switch case block to exit the switch statement, and it is optional. If the break statement is not used, the code execution will continue to the next case statement.

17) How do you use the continue statement in a loop in Java?

The continue statement is used inside a loop to skip the current iteration of the loop and continue with the next iteration. It can be used inside a for, while, or do-while loop.