Groovy - Map putAt(Object key, Object value) method

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Description

Groovy Map putAt(Object key, Object value) method allows to use subscript operator to be used in a Map.

Syntax

public Object putAt(Object key, Object value)

Parameters

• key − Object as key of the Map

• value − Object as value of the Map

Return Value

Current map with entries of collection passed.

Example - Adding entry to a Map of String and String

Following is an example of the usage of this method −

main.groovy

// define a map
def map = ["A" : "Apple", "B" : "Banana"] 

// add entry to the map
map.putAt("C","Carrot")

// add entry using subscript operator
map["G"] = "Grapes"

println(map)

Output

When we run the above program, we will get the following result −

[A:Apple, B:Banana, C:Carrot, G:Grapes]

Example - Adding entry to a Map of Integer and Integer

Following is an example of the usage of this method −

main.groovy

// define map
def map = [1 : 11, 2 : 12]

// add entry to the map
map.putAt(3,13)

// add entry using subscript operator
map[4] = 14

println(map)

Output

When we run the above program, we will get the following result −

[1:11, 2:12, 3:13, 4:14]

Example - Adding entry to a Map of Integer and Object

Following is an example of the usage of this method −

main.groovy

// define maps
def map = [1 : new Student(1, "Julie"), 2 : new Student(2, "Robert")] 

// add entry to the map
map.putAt(3,new Student(3, "Markus"))

// add entry using subscript operator
map[4] = new Student(4, "Adam")

println(map)

class Student{
   int rollNo
   String name

   Student(int rollNo, String name){
      this.rollNo = rollNo
      this.name = name
   }

   @Override
   public boolean equals(Object obj) {
      Student s = (Student)obj
      return this.rollNo == s.rollNo && this.name.equalsIgnoreCase(s.name)
   }
   
   @Override
   public String toString() {
      return "[ " + this.rollNo + ", " + this.name + " ]"
   }
}

Output

When we run the above program, we will get the following result −

[1:[ 1, Julie ], 2:[ 2, Robert ], 3:[ 3, Markus ], 4:[ 4, Adam ]]