Conditional Operators

자바의 조건문에서 주로 쓰이는 연산자들에 대해 정리하였습니다.

 

 

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< Introduction to Conditional Operators >

Conditional operators help simplify expressions containing complex boolean relationships by reducing multiple boolean values to a single value: true or false.

There's three conditional operators

 

&amp;lt; Conditional Operators &amp;gt;

 

 

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< And: && >

Checks if both provided expressions are truthy.

 

Example)

String mood = "sleepy";
int tirednessLevel = 6;

if (mood.equals("sleepy") && tirednessLevel > 8) {
  System.out.println("Time to sleep");
} else {
  System.out.println("Not bet time yet");
}

 

 

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< Or: || >

Checks if either provided expressions are truthy.

 

+. short-circuited evaluation.

The compiler can determine the truth value of a logical expression by only evaluating the first boolean operand.

it only works with && and ||

 

Example : || (or)

if (1 > 0 || 2 / 0 == 7) {
  System.out.println("No errors here!");
}

: Second operand is not executed.

In && expression, If the first operand in the expression is false, the entire value will be false.

 

 

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< Logical NOT: ! >

Switches the truthiness and falsiness of a value.

 

!false
// true
!true
// false

 

 

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< Combining Conditional Operators >

The order of evaluation when it comes to conditional operators is as follows:

1. Conditions placed in parentheses - ( )
2. NOT - !
3. AND - &&
4. OR - ||

 

Example)

true && !(false || !true)
// first : ()
true && !(false || false)
true && !false
// second : !
true && true
// third : &&
true