Java Basics---The use of parameterless with return value methods in Java (37)

Use of the non-parametric return value method in Java

If the method does not contain a parameter, but has a return value, we call it a method with no parameter return value.

For example: The following code, which defines a method named Calsum, has no arguments, but the return value is of type int, performs an operation that calculates the sum of two numbers and returns the result

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In the Calsum () method, the return value type is type int, so you must return an integer value using return in the method body.

When calling a method with a return value, it is important to note that because the method executes returns a result, the return value is generally received and processed when the return value method is called. Such as:

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Operation Result: 650) this.width=650; "src=" http://img.mukewang.com/537d6d0000012b1e01290026.jpg "/>

"Small traps" that cannot be overlooked:

1. If the return type of the method is void, the return value cannot be used in the method!

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2. The return value of a method can have at most one and cannot return multiple values

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3, the type of the method return value must be compatible, for example, if the return value type is int, you cannot return a String value

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Code:

Public class HelloWorld {
   
    public static void Main (string[] args) {
& nbsp;      
  //Create an object named Hello
  helloworld hello = new HelloWorld ();
       
  //calls the Calcavg () method of the Hello object and saves the return value in the variable avg
   double avg = Hello.calcavg ();
        Double sum = hello.calcsum ();
       
  system.out.println ("Average score:" + avg);
        System.out.println ("Sum of the two achievements:" + sums);
 }

Defines a method that returns a value of type double
Public double Calcavg () {

Double java = 92.5;
Double php = 83.0;
Double avg = (java + php)/2; Calculate average

return value using return
return avg;

}
Public double calcsum () {
Double java = 92.5;
Double php = 83.0;
Double sum = java + php;
return sum;
}
}

Operation Result:

Average score: 87.75
The sum of two achievements is: 175.5

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Java Basics---The use of parameterless with return value methods in Java (37)