Java method parameter list object

Example 1: Pass ArrayList as Function Parameter

import java.util.ArrayList; class Main { public static void display[ArrayList languages] { System.out.print["ArrayList: "]; for[String language : languages] { System.out.print[language + ", "]; } } public static void main[String[] args] { // create an arraylist ArrayList 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 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.