![java package tutorial](/java/lang/images/java.jpg)
- Java.lang Package classes
- Java.lang - Home
- Java.lang - Boolean
- Java.lang - Byte
- Java.lang - Character
- Java.lang - Character.Subset
- Java.lang - Character.UnicodeBlock
- Java.lang - Class
- Java.lang - ClassLoader
- Java.lang - Compiler
- Java.lang - Double
- Java.lang - Enum
- Java.lang - Float
- Java.lang - InheritableThreadLocal
- Java.lang - Integer
- Java.lang - Long
- Java.lang - Math
- Java.lang - Number
- Java.lang - Object
- Java.lang - Package
- Java.lang - Process
- Java.lang - ProcessBuilder
- Java.lang - Runtime
- Java.lang - RuntimePermission
- Java.lang - SecurityManager
- Java.lang - Short
- Java.lang - StackTraceElement
- Java.lang - StrictMath
- Java.lang - String
- Java.lang - StringBuffer
- Java.lang - StringBuilder
- Java.lang - System
- Java.lang - Thread
- Java.lang - ThreadGroup
- Java.lang - ThreadLocal
- Java.lang - Throwable
- Java.lang - Void
- Java.lang Package extras
- Java.lang - Interfaces
- Java.lang - Errors
- Java.lang - Exceptions
- Java.lang Package Useful Resources
- Java.lang - Useful Resources
- Java.lang - Discussion
Java Runtime gc() Method
Description
The Java Runtime gc() method runs the garbage collector. Calling this method suggests that the Java virtual machine expend effort toward recycling unused objects in order to make the memory they currently occupy available for quick reuse. When control returns from the method call, the virtual machine has made its best effort to recycle all discarded objects.
The name gc stands for "garbage collector". The virtual machine performs this recycling process automatically as needed, in a separate thread, even if the gc method is not invoked explicitly. The method System.gc() is the conventional and convenient means of invoking this method.
Declaration
Following is the declaration for java.lang.Runtime.gc() method
public void gc()
Parameters
NA
Return Value
This method does not return a value.
Exception
NA
Example: Running Garbage Collector
The following example shows the usage of lang.Runtime.gc() method. We've run the garbage collector using gc() method and printed the status.
package com.tutorialspoint; public class RuntimeDemo { public static void main(String[] args) { // print when the program starts System.out.println("Program starting..."); // run the garbage collector System.out.println("Running Garbage Collector..."); Runtime.getRuntime().gc(); System.out.println("Completed."); } }
Output
Let us compile and run the above program, this will produce the following result −
Program starting... Running Garbage Collector... Completed.