Java Program to Pass ArrayList as the function argument

Example 1: Pass ArrayList as Function Parameter

 import java.util.ArrayList; class Main { public static void display(ArrayList<String> languages) { System.out.print("ArrayList: "); for(String language : languages) { System.out.print(language + ", "); } } public static void main(String[] args) { // create an arraylist ArrayList<String> languages = new ArrayList<>(); languages.add("Java"); languages.add("Python"); languages.add("JavaScript"); // passing arraylist as function parameter display(languages); } }

Output

 ArrayList: Java, Python, JavaScript,

In the above example, we have created an arraylist named languages. Here, we have a method display(). It prints elements of arraylist.

Notice the line,

 display(languages);

Here, we have passed languages as the function parameter.

Example 2: Pass ArrayList as Function Parameter by converting into Array

 import java.util.ArrayList; class Main { public static void percentage(Integer[] marks) { int totalMarks = 300; int obtainedMarks = 0; for(int mark : marks) { obtainedMarks += mark; } // compute average double percent = (obtainedMarks * 100) / totalMarks; System.out.println("Percentage: " + percent); } public static void main(String[] args) { // create an arraylist ArrayList<Integer> marks = new ArrayList<>(); marks.add(67); marks.add(87); marks.add(56); System.out.println("Marks: " + marks); // passing arraylist as function parameter percentage(marks.toArray(new Integer[marks.size()])); } }

Output

 Marks: [67, 87, 56] Percentage: 70.0

In the above example, we have created an arraylist named marks. Notice the line,

 percentage(marks.toArray(new Integer[0]));

Here, we are passing the arraylist as an argument to the percentage() method.

Also Read:

• Java Program to pass method call as arguments to another method
• Java Program to Iterate over ArrayList using Lambda Expression