Advertisement
Google Ad Slot: content-top
Java If Else
if Statement:
The if statement is used to execute a block of code only if a specified condition evaluates to true.
Syntax:
if (condition) {
// Code to execute if condition is true
}
Example
int age = 20;
if (age >= 18) {
System.out.println("You are eligible to vote.");
}
if...else Statement:
The if...else statement allows you to execute one block of code if the condition is true and another block if the condition is false
Syntax:
if (condition) {
// Code to execute if condition is true
} else {
// Code to execute if condition is false
}
Example
int age = 16;
if (age >= 18) {
System.out.println("You are eligible to vote.");
} else {
System.out.println("You are not eligible to vote.");
}
if...else if...else Statement
For multiple conditions, you can use else if blocks.
Syntax:
if (condition) {
// Code to execute if condition is true
} else if(condition2) {
// Code to execute else if condition is true
} else {
// Code to execute if and else if condition is false
}
Example
int score = 85;
if (score >= 90) {
System.out.println("Grade: A");
} else if (score >= 80) {
System.out.println("Grade: B");
} else if (score >= 70) {
System.out.println("Grade: C");
} else {
System.out.println("Grade: F");
}
Ternary Operator:
For simple if...else conditions, you can use the ternary operator:
Example
int age = 20;
String status = age >= 18 ? "Adult" : "Minor";
System.out.println(status); // Adult
Nested if...else:
You can nest if...else statements inside each other, but keep readability in mind.
Example
int number = 10;
if (number > 0) {
if (number % 2 == 0) {
System.out.println("The number is positive and even.");
} else {
System.out.println("The number is positive and odd.");
}
} else {
System.out.println("The number is not positive.");
}
Logical Operators in Conditions
You can use logical operators (&&, ||, !) to combine conditions.
1.AND (&&):
Example
int age = 25;
if (age > 18 && age < 30) {
System.out.println("You are in your 20s.");
}
2.OR (||):
Example
String day = "Saturday";
if (day == "Saturday" || day === "Sunday") {
System.out.println("It's the weekend!");
}
3.NOT (!):
Example
boolean isRaining = false;
if (!isRaining) {
System.out.println("You can go outside without an umbrella.");
}