Java Methods – Vidvaan – Java Tutorial

A Java method is a collection of statements that are grouped together to perform an operation. When you call the System.out.println() method, for example, the system actually executes several statements in order to display a message on the console.

Now you will learn how to create your own methods with or without return values, invoke a method with or without parameters, and apply method abstraction in the program design.

Creating Method

Considering the following example to explain the syntax of a method −

package com.vidvaan.corejava.exception01.introduction;

import java.io.IOException;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Scanner;

// Exception Handling Program
public class ExceptionHandlingDemo {
	public static void main(String[] args) {
		System.out.println("main begin");

		System.out.println("Finding value for : numberOfRecordsToRead");
		int numberOfRecordsToRead = -1;
		try {
			// Reading config.txt file to get value for numberOfRecordsToRead
			Path filePath = Paths.get("config.txt");
			Scanner scanner = new Scanner(filePath);
			if (scanner.hasNext()) {
				numberOfRecordsToRead = scanner.nextInt();
			}
		} catch (IOException e) {
			// Assigning default value 10 when file reading failed
			System.out.println("Exception raised while reading config.txt");
			numberOfRecordsToRead = 10;
		}
		System.out.println("numberOfRecordsToRead : " + numberOfRecordsToRead);

		// This final statement also executes even exception is raised, Because
		// exception is handled
		System.out.println("main end");
	}
}

package com.vidvaan.corejava.exception01.introduction;

import java.io.IOException;

import java.nio.file.Path;

import java.nio.file.Paths;

import java.util.Scanner;

// Exception Handling Program

public class ExceptionHandlingDemo {

public static void main(String[] args) {

System.out.println("main begin");

System.out.println("Finding value for : numberOfRecordsToRead");

int numberOfRecordsToRead = -1;

try {

// Reading config.txt file to get value for numberOfRecordsToRead

Path filePath = Paths.get("config.txt");

Scanner scanner = new Scanner(filePath);

if (scanner.hasNext()) {

numberOfRecordsToRead = scanner.nextInt();

}

} catch (IOException e) {

// Assigning default value 10 when file reading failed

System.out.println("Exception raised while reading config.txt");

numberOfRecordsToRead = 10;

}

System.out.println("numberOfRecordsToRead : " + numberOfRecordsToRead);

// This final statement also executes even exception is raised, Because

// exception is handled

System.out.println("main end");

}

Output :

main begin
Finding value for : numberOfRecordsToRead
Exception raised while reading config.txt
numberOfRecordsToRead : 10
main end