If … Else in Java

Java Conditions and If Statements

Java supports the usual logical conditions from mathematics:

• Less than: a < b
• Less than or equal to: a <= b
• Greater than: a > b
• Greater than or equal to: a >= b
• Equal to a == b
• Not Equal to: a != b

You can use these conditions to perform different actions for different decisions.

Java has the following conditional statements:

• Use if to specify a block of code to be executed, if a specified condition is true
• Use else to specify a block of code to be executed, if the same condition is false
• Use else if to specify a new condition to test, if the first condition is false
• Use switch to specify many alternative blocks of code to be executed

1)The if Statement

Use the if statement to specify a block of Java code to be executed if a condition is true.

In the example below, we test two values to find out if 20 is greater than 18. If the condition is true, print some text:

Example

public class MyClass

{
public static void main(String[] args)

{
int x = 20;
int y = 18;
if (x > y)

{
System.out.println(“x is greater than y”);
}
}
}

2)The else Statement

Use the else statement to specify a block of code to be executed if the condition is false.

Example

public class Conditional

{
public static void main(String[] args)

{
int x = 20;
int y = 18;
if (x > y)
{
System.out.println(“x is greater than y”);
}
else
{
System.out.println(“y is greater then x”);
}
}
}

3)The else if Statement

Use the else if statement to specify a new condition if the first condition is false.

Example

public class Conditional

{
public static void main(String[] args)

{
int x = 20;
int y = 18;
if (x > y)
{
System.out.println(“x is greater than y”);
}
else if(y > x)
{
System.out.println(“y is greater then x”);
}
else
{
System.out.println(“x is equal y”);
}
}
}