- Java Basic
- Java Object Oriented
- Java Advanced
- Java Decision Making
There are two types of decision making statements in Java. They are:
- if statements
- switch statements
The syntax of enhanced if statement is:
Example
Output
if...else Statement
An if statement can be followed by an optional else statement, which executes when the Boolean expression is false.
Syntax
The syntax of a if...else is:
Example
Output
if...else if...else Statement
An if statement can be followed by an optional else if...else statement, which is very usefull to test various conditions using single if...else if statement.
When using if, else if , else statements there are few points to keep in mind.
- An if can have zero or one else's and it must come after any else if's.
- An if can have zero to many else if's and they must come before the else.
- Once an else if succeeds, none of he remaining else if's or else's will be tested.
Syntax
The syntax of a if...else if is:
Example
Output
Nested if...else Statement
It is always legal to nest if-else statements, which means you can use one if or else if statement inside another if or else if statement.
Syntax
The syntax of a nested if...else if is:
Example
Output
switch Statement
A switch statement allows a variable to be tested for equality against a list of values. Each value is called a case, and the variable being switched on is checked for each case.
Syntax
The syntax of a switch statement if is:
The following rules apply to a switch statement:
- The variable used in a switch statement can only be a byte, short, int, or char.
- You can have any number of case statements within a switch. Each case is followed by the value to be compared to and a colon.
- The value for a case must be the same data type as the variable in the switch, and it must be a constant or a literal.
- When the variable being switched on is equal to a case, the statements following that case will execute until a break statement is reached.
- When a break statement is reached, the switch terminates, and the flow of control jumps to the next line following the switch statement.
- Not every case needs to contain a break. If no break appears, the flow of control will fall through to subsequent cases until a break is reached.
- A switch statement can have an optional default case, which must appear at the end of the switch. The default case can be used for performing a task when none of the cases is true. No break is needed in the default case.
Example
