====== if ======
<code java>
 if ( condition == true ){
    command;    
 }
</code>
check if a condition is true or false

===== example of if in java =====
<code java>


package plausibilitycheck;

import java.util.Scanner;

public class Plausibilitycheck{

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {

        int celsius;
        double fahrenheit;

        Scanner scan = new Scanner(System.in);

        System.out.print("Please type in Celsius : ");
        celsius = scan.nextInt();

        if (celsius >= 0) {

            fahrenheit = celsius * 1.8 + 32;
            System.out.println(celsius + "° Celsius are " + fahrenheit + "° Fahrenheit");
        } 

    }
}

</code>


=== a other example ===
<code java>
        if  ( (name == "meier" || name == "müller") && place =="hamburg" )  {
            //if the name meier or müller & the place hamburg
        }
        if (! ( (name == "meier" || name == "müller") && place =="hamburg" ) ) {
            //if the name not meier or müller & the place not hamburg
        }
</code>


=== output if ===
     Please type in Celsius: 5
     5° Celsius are 41.0° Fahrenheit