Return type in java is used inside of method for the purpose of returning value in program when method complete it’s execution. A java return type may be int, float, double, or void data type(void returns nothing).
It is reserved keyword in java and determine the ending of method.
Example 1:
public class Main {
static int add(int x) {
return 5 + x;
}
public static void main(String[] args) {
System.out.println(add(3));
}
}Output:
8
In the above example add() methods return 5+x as output which is 8.
Examples 2:
class A
{
byte b= 10;
public int returnValue()
{
System.out.println("Hello");
return b;
}
public static void main(String arg[])
{
A ob= new A();
System.out.println(ob.returnValue());
}
}
Example to return Integer Value in Java
Example 3:
public class ReturnExample1 {
int display()
{
return 4;
}
public static void main(String[] args) {
ReturnExample1 e1 =new ReturnExample1();
System.out.println(e1.display());
}
}
Output:
4
Let see can we use Return in Void method.
public class ReturnExample2 {
void display()
{
return null;
}
public static void main(String[] args) {
ReturnExample2 e =new ReturnExample2();
e.display();
}
}
Output:
Void methods cannot return a value
Program for Return value in java
// Java program to illustrate usage
// of return keyword
class A {
// Since return type of RR method is double
// so this method should return double value
double RR(double a, double b)
{
double sum = 0;
sum = (a + b) / 2.0;
// return statement below:
return sum;
}
public static void main(String[] args)
{
System.out.println(new A().RR(5.5, 6.5));
}
}
Output:
6.0
Critical points of Return types in java.
- Return type is used to exit from the method.
- You cannot use return keyword in void method.
- return statement need not to be last statement in a method, but it must be last statement to execute in a method.
- The value passed with return keyword must match with return type of the method.