简化布尔表达式示例

Question

how to simplify

if ( this.something == false ) 

this boolean expression ? Actually I want to ask is what is Simplify Boolean Expression ?

Answer 1

You can simply do:

if (!this.something)

You can use boolean variables directly:

Example:

boolean flag = true;
if(flag) {
    //do something
}

Answer 2

Use like following since if expression need a boolean value.

if (!this.something) {
//
}

Answer 3

You can use ternary operator for more simplification :

int someVariable = (this.something) ? 0:1;

someVariable will be 1 if this.something is false .

Hope this helps.

Answer 4

To simplify boolean expression is to reduce complexity of this expression, with preserving the meaning.

In your case:

if(!this.something)

has the same meaning but it's a little bit shorter.

To simplify more complex examples you can use truth tables or Karnaugh maps.

Answer 5

Generally the if statement wants to evaluate whatever is within it into a boolean if

boolean something = true;
if(something == true) evaluates to true
if(something != true) evaluates to false

but you can also do

if(something) evaluates to whatever something is (true in this case)
if(!something) evaluates to opposite what something is (false in this example)

Also you can simplify if statements in certain cases by using a ternary operator:

boolean isSomethingTrue = (something == true) ? true : false;
boolean isSomethingTrue = something ? true : false;
type variable = (condition) ? return this value if condition met : return this value if condition is not met;