Groovy: Method pointer operator (.&)

Method pointer operator (.&) is used to store a reference of the method in a variable.

HelloWorld.groovy

class Arithmetic{
 int sum(int a, int b){
  return a + b
 }
 
 int sub(int a, int b){
  return a - b
 }
} 

Arithmetic obj = new Arithmetic();

def addition = obj.&sum // Refer sum function of obj
def subtraction = obj.&sub // Refer sub function of obj

int result1 = addition(10, 20)
int result2 = subtraction(10, 20)

println "Sum of 10 and 20 is ${result1}"
println "Subtraction of 10 and 20 is ${result2}"

Output

Sum of 10 and 20 is 30

Subtraction of 10 and 20 is -10

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