Java System gc() Method

The gc() method of System class runs the garbage collector. Through this method, JVM makes best effort to reuse the memory of discarded objects for quick reuse.

Syntax

Example 1

import java.awt.Window;
public class SystemGCExample1 {

	public static void main(String[] args) {
		 
		for (int i = 0; i< 100; i++) {
		new Window(null);
		     }
		System.out.println("before garbage collection = "+Window.getWindows().length);
		System.gc();
		System.out.println("after garbage collection = "+Window.getWindows().length);
		  }
}

Test it Now

Output:

before garbage collection = 100
after garbage collection = 0

Example 2

public class SystemGCExample2 {

	public static void main(String[] args) {
		String i=null; //value of i is null
		System.gc(); 
		System.out.println(i); //value of i after gc		
		}
}

Test it Now

Output:

null

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