how to return a course on java

public Course [] getCourses () { return courses.toArray (new Course [courses.size ()]); }

Full Answer

How do you pass and return an object in Java?

Passing and Returning Objects in Java. In java, a method can return any type of data, including objects. For example, in the following program, the incrByTen( ) method returns an object in which the value of a (an integer variable) is ten greater than it is in the invoking object.

What should be the return type of a method?

The return type of the method and type of data returned at the end of the method should be of the same type. For example, if a method is declared with the float return type, the value returned should be of float type only.

What is the syntax of a return statement in Java?

The syntax of a return statement is the return keyword is followed by the value to be returned. The following Java programs demonstrate the use of return statements. System.out.println ("The greater number among x and y is: " + result);

How do you return a Java program?

Let's see a simple example to return integer value.public class ReturnExample1 {int display(){return 10;}public static void main(String[] args) {ReturnExample1 e =new ReturnExample1();System.out.println(e.display());More items...

What is the return command in Java?

What is a return statement in Java? In Java programming, the return statement is used for returning a value when the execution of the block is completed. The return statement inside a loop will cause the loop to break and further statements will be ignored by the compiler.

Can a method return a class in Java?

Every Method has a return type whether it is void, int, double, string or any other datatype. The getReturnType() method of Method class returns a Class object that represent the return type, declared in method at time of creating the method.

What does return 1 do in Java?

Your method has no return type, Provide a return type of int in your method. And return -1 means nothing in java, you are just returning a int value, thats it.

What is the return type () method?

A method returns to the code that invoked it when it completes all the statements in the method, reaches a return statement, or throws an exception, whichever occurs first. You declare a method's return type in its method declaration. Within the body of the method, you use the return statement to return the value.

What is return type method in Java?

A return statement causes the program control to transfer back to the caller of a method. Every method in Java is declared with a return type and it is mandatory for all java methods. A return type may be a primitive type like int, float, double, a reference type or void type(returns nothing).

How do I return a class object?

If a method or function returns an object of a class for which there is no public copy constructor, such as ostream class, it must return a reference to an object. Some methods and functions, such as the overloaded assignment operator, can return either an object or a reference to an object.

Is class return type?

When a method uses a class name as its return type, such as pop does, the class of the type of the returned object must be either a subclass of or the exact class of the return type.

How can you return an object from the method of a class?

"In order to return an object from a Java method, you must first declare a variable to hold a reference to the object." So in this case, Ball is a variable that is a reference to the object. Correct? redBall is a reference to the object created by the new Ball("red") statement.

Does return 0 end the program?

return 0 in the main function means that the program executed successfully. return 1 in the main function means that the program does not execute successfully and there is some error.

What does return 0 do in Java?

It is a keyword which is used to return some value, so it does not need any declaration.It needs only return keyword with value or variables. 4. Generally, return 0 is used to return exit code to the operating system. If we want to explicitly specify an exit code to the operating system, we have to use System.

What is meant by return 0?

'return 0' means that the function doesn't return any value. It is used when the void return type is used with the function. It is not mandatory to add a 'return 0' statement to the function which doesn't return any value, the compiler adds it virtually. 30th June 2019, 11:21 PM.

What is a return statement in Java?

In Java programming, the return statement is used for returning a value when the execution of the block is completed. The return statement inside a loop will cause the loop to break and further statements will be ignored by the compiler.

Returning a Value from a Method

In Java, every method is declared with a return type such as int, float, double, string, etc.

Syntax

The syntax of a return statement is the return keyword is followed by the value to be returned.

Definition and Usage

The return keyword finished the execution of a method, and can be used to return a value from a method.

More Examples

Tip: Use the void keyword to specify that a method should not have a return value:

Option 2

The uses arrays, but it doesn't scale. Assume that a teacher can only have a maximum of X courses, in my example 10:

Option 3

This is identical to the previous item, but is a bit smarter in that it can resize the array... by creating a new one using the static method Arrays.copyOf

What is a method in Java?

In java, a method can return any type of data, including objects. For example, in the following program, the incrByTen ( ) method returns an object in which the value of a (an integer variable) is ten greater than it is in the invoking object.

Why does Java change when passing an object to a method?

But when we pass an object to a method, the situation changes dramatically, because objects are passed by what is effectively call-by-reference. Java does this interesting thing that’s sort of a hybrid between pass-by-value and pass-by-reference. Basically, a parameter cannot be changed by the function, but the function can ask ...

Is Java a pass or return?

Passing and Returning Objects in Java. Although Java is strictly pass by value, the precise effect differs between whether a primitive type or a reference type is passed. When we pass a primitive type to a method, it is passed by value.