#system class

First Java “Hello World” Program

First Java “Hello World” Program

Here is the first Java program “Hello World” program for basic understanding about the Java Syntax and execution of a program.

public class HelloWorldFirstProgram { public static void main(String[] args) { // Prints the string to the console. System.out.println("Hello World!"); } }

Output

Hello World !

See Also :

How to execute a Java…

Methods to invoke garbage collector explicitly

There are two ways to make a request to Java Virtual Machine in order to execute garbage collector explicitly:

Using System Class

This class support rich methods that deals with standard input and output, loading files and libraries and so on. It falls under Java.lang package. It also provides a method named gc() to request JVM to make an effort to run a garbage collector. Syntax:

System.gc();

Sin…