Conditionals

All the conditional statements are same as of other languages.

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

Use else to specify a block of code to be executed, if the same condition is false
int time = 20; if (time < 18) { System.out.println("Good day."); } else { System.out.println("Good evening."); } // Outputs "Good evening."

Use else if to specify a new condition to test, if the first condition is false
int time = 22; if (time < 10) { System.out.println("Good morning."); } else if (time < 20) { System.out.println("Good day."); } else { System.out.println("Good evening."); } // Outputs "Good evening."

Use switch to specify many alternative blocks of code to be executed
switch(expression) { case x: // code block break; case y: // code block break; default: // code block }