With this example we are going to demonstrate how to use Overloading Java Methods in a class. Overloaded methods are methods with the same name signature but either a different number of parameters or different types in the parameter list. We have created a class, that has constructors and methods with the same names but with different arguments and use them in new class instances to see their behavour. Specificaly:
Treeclass has an int field,treeHeight.- It has a constructor where it sets its int field to zero.
- It also has a constructor where it sets its int field to a given int value.
- It has a method
void info()where it prints a message with the field. - It also has a method
void info(String str)where it prints a message with a given String and the int field. - We create two new
Treeobjects and for each one of them callinfo()andinfo(String str)methods. - The objects are created using the constructor with the int argument.
- Then a new instance of Tree is created using the constructor without fields.
Let’s take a look at the code snippet that follows:
01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 | package com.javacodegeeks.snippets.core;class Tree { int treeHeight; Tree() { System.out.println("Plant a seedling"); treeHeight = 0; } //Overloaded Constructor //Notice that the two constructors have the same name , but different arguments Tree(int num) { System.out.println("Creating new Tree that is " + num + " meters tall"); treeHeight = num; } void info() { System.out.println("Tree is " + treeHeight + " meters tall"); } void info(String str) { System.out.println(str + ": Tree is " + treeHeight + " meters tall"); }}public class MethodOverloading{ public static void main(String[] args) { for (int i = 0; i < 2; i++) {Tree t = new Tree(i);t.info();t.info("overloaded method"); } // Overloaded constructor: new Tree(); }} |
Output
Creating new Tree that is 0 meters tall
Tree is 0 meters tall
overloaded method: Tree is 0 meters tall
Creating new Tree that is 1 meters tall
Tree is 1 meters tall
overloaded method: Tree is 1 meters tall
Plant a seedling
This was an example of how to use overloaded methods in a class in Java.
