if and if-else Statements in Java
Learn how to use if and if-else statements in Java to make decisions based on conditions, with clear explanations and real-world examples.
if and if-else Statements in JavaLink to this section
The if and if-else statements are decision-making control statements in Java. They allow a program to execute different blocks of code based on whether a condition is true or false.
These statements are widely used in real-world applications such as login validation, result processing, and eligibility checks.
The if StatementLink to this section
The if statement executes a block of code only when the given condition evaluates to true. If the condition is false, the code inside the if block is skipped.
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How Conditions Work in if StatementsLink to this section
Conditions are written using relational and logical operators. These operators compare values and produce true or false.
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The if-else StatementLink to this section
The if-else statement provides an alternative path of execution when the condition is false. If the condition is true, the if block executes; otherwise, the else block executes.
Nested if-else StatementsLink to this section
An if-else statement placed inside another if or else block is called a nested if-else. It is useful when multiple conditions need to be checked.
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Real-World Use Cases of if and if-elseLink to this section
if and if-else statements are commonly used in:
- Login authentication systems
- Checking eligibility criteria
- Displaying results based on user input
- Validating form data
What happens if the condition in an if statement is false?
if and if-else Statements
- Write a program to check whether a person is eligible to vote.
- Create a program that checks whether a number is positive, negative, or zero.
- Write a program that displays grades based on marks using nested if-else.
- Convert a real-life decision (ATM withdrawal validation) into if-else logic.
- Refactor a deeply nested if-else program into a cleaner and more readable version.