Java ☕ Methods смотреть онлайн

A method is a reusable bit of code that you can activate or call at any point in your code.

Writing a Method
In a previous lesson, we wrote a short program that printed out the temperatures of lab one and lab two. We may want to do this at various points in out final program. Rather than retype this code every time we want to use it, we can put it in a method. Methods are wrapped in curly braces and identified by a name. Let's name our function 'readTemps'.

readTemps {
}
Methods also need a return type. A return type says the datatype of the value returned by the function if any is returned. In this case, the method won't return a value so we will type void.

void readTemps {
}
The last thing a method needs are parameters. A parameter is a special variable that is set every time the method is called. The parameters go inside parentheses right after the method name. Since this method needs no parameters, we will leave the parentheses blank.

void readTemps() {
}
Now, all we need to do is write the code for the method inside the curly brackets.

void readTemps() {

double temp1 = myLab.T1();
double temp2 = myLab.T2();
System.out.println("Temperature 1: " + temp1)
System.out.println("Temperature 2: " + temp2)
}
Now, any time we want to print out the two temperatures, we can just call the method with the statement readTemps(); and the computer will print out the two temperatures just as we did in the previous lesson!



Java Course: https://apmonitor.github.io/begin_java
Course Overview: https://apmonitor.com/che263/index.php/Main/BeginJava
Source Code: https://github.com/APMonitor/begin_java
Temperature Control Lab: https://apmonitor.com/heat.htm