Groovy - List take(int num) method

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Description

Groovy List take(int num) method returns first given number of elements from the head of the list. In list has less number of items, then entire list is returned.

Syntax

public List take(int num)

Parameters

num − number of items to be taken from the head of the list.

Return Value

A list of first num items.

Example - Taking first two number from a List of Integers

Following is an example of the usage of this method −

main.groovy

def lst = [11, 12, 13, 14, 15]

// getting first two elements
firstTwoItems = lst.take(2)
println(firstTwoItems)

// original list is intact
println(lst)

Output

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

[11, 12]
[11, 12, 13, 14, 15]

Example - Taking first two strings from a List of Strings

Following is an example of the usage of this method −

main.groovy

def lst = ["Apple","Mango","Orange","Papaya"]

// getting first two elements
firstTwoItems = lst.take(2)
println(firstTwoItems)

// original list is intact
println(lst)

Output

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

[Apple, Mango]
[Apple, Mango, Orange, Papaya]

Example - Taking first two objects from a List of Objects

Following is an example of the usage of this method −

main.groovy

def lst = [new Student(1, "Julie"),new Student(2, "Robert"),new Student(3, "Adam")]

// getting first two elements
firstTwoItems = lst.take(2)
println(firstTwoItems)

// original list is intact
println(lst)

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, Julie ], [ 2, Robert ]]
[[ 1, Julie ], [ 2, Robert ], [ 3, Adam ]]