This is an example of how to get the JVM memory information with Runtime class. Every Java application has a single instance of class Runtime that allows the application to interface with the environment in which the application is running. The current runtime can be obtained from the getRuntime method. An application cannot create its own instance of this class. To get the JVM memory information with Runtime class you should:
- Use
getRuntime()API method of Runtime. This method returns the runtime object associated with the current Java application. - Use
freeMemory()API method of Runtime. This method returns the amount of free memory in the Java Virtual Machine. - Call
maxMemory()API method of Runtime. This method returns the maximum amount of memory that the Java virtual machine will attempt to use. If there is no inherent limit then the valueLong.MAX_VALUEwill be returned. - Call
totalMemory()API method of Runtime. This method returns the total amount of memory in the Java virtual machine.
Let’s take a look at the code snippet that follows:
package com.javacodegeeks.snippets.core;
public class GetJVMMemoryInformationWithRuntime {
public static void main(String[] args) {
// get the runtime object associated with the current Java application
Runtime runtime = Runtime.getRuntime();
long freeMemory = runtime.freeMemory();
System.out.println("Free memory in JVM (bytes): " + freeMemory);
long maxMemory = runtime.maxMemory();
System.out.println("Max memory in JVM (bytes): " + maxMemory);
long totalMemory = runtime.totalMemory();
System.out.println("Total memory in JVM (bytes): " + totalMemory);
}
}
Output:
Free memory in JVM (bytes): 4963280
Max memory in JVM (bytes): 66650112
Total memory in JVM (bytes): 5177344
This was an example of how to get the JVM memory information with Runtime class in Java.
