Runtime gc() in Java

gc(): This method is available in the java.lang.Runtime class of Java.

Syntax:

void java.lang.Runtime.gc()

This method runs the garbage collector in the Java Virtual Machine.

Calling this method suggests that the Java Virtual Machine expends effort toward recycling unused objects in order to make the memory they currently occupy available for reuse by the Java Virtual Machine.

When control returns from the method call, the Java Virtual Machine has made the best effort to reclaim space from all unused objects. There is no guarantee that this effort will recycle any particular number of unused objects, reclaim any particular amount of space, or complete at any particular time, if at all, before the method returns or ever.

Parameters: NA

Returns: NA

Exceptions: NA

Approach

Java

package com.Runtime;

public class Runtimegc {
    public static void main(String[] args) {

        Runtime runtime = Runtime.getRuntime();

        runtime.gc();
        System.out.println("Successfully runs the 
                                    garbage collector");

    }
}

Output:

Successfully runs the garbage collector

Some other methods of Runtime

addShutdownHook(Thread): This method registers a new virtual machine shutdown hook.

availableProcessors(): This method returns the number of processors available to the Java virtual machine.

exec(String): This method executes the specified string command in a separate process.

exec(String[]): This method executes the specified command and arguments in a separate process.

exec(String, String[]): This method executes the specified string command in a separate process with the specified environment.

exec(String[], String[]): This method executes the specified command and arguments in a separate process with the specified environment.

exec(String, String[], File): This method executes the specified string command in a separate process with the specified environment and working directory.

exec(String[], String[], File): This method executes the specified command and arguments in a separate process with the specified environment and working directory.

gc(): This method runs the garbage collector in the Java Virtual Machine.

Runtime.getRuntime(): This method returns the runtime object associated with the current Java application.

halt(int): This method forcibly terminates the currently running Java virtual machine.

load(String): This method loads the native library specified by the filename argument.

loadLibrary(String): This method loads the native library specified by the libname argument.

maxMemory(): This method returns the maximum amount of memory that the Java virtual machine will attempt to use.

removeShutdownHook(Thread): This method De-registers a previously registered virtual machine shutdown hook.

runFinalization(): This method runs the finalization methods of any objects pending finalization.

version(): This method returns the version of the Java Runtime Environment as a Version.

exit(int): This method terminates the currently running Java virtual machine by initiating its shutdown sequence. This method never returns normally.

freeMemory(): This method returns the amount of free memory in the Java Virtual Machine.

totalMemory(): This method returns the total amount of memory in the Java virtual machine.