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What is Runtime.maxMemory() in Java?

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Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

What is the Runtime class in Java?

The Runtime class has methods that interface and interact with the environment in which the application is run.

The maxMemory() method

The maxMemory() method of the Runtime class is used to retrieve the maximum memory that the Java Runtime Environment (JVM) will attempt to use. This method returns a value in bytes.

Method signature

public native long maxMemory()

Return value

This method returns the maximum memory that the JVM will attempt to use.

Example

public class Main {
public static void main(String[] args){
Runtime currentRuntime = Runtime.getRuntime();
System.out.println("Runtime.maxMemory() = " + currentRuntime.maxMemory() + " bytes");
}
}

Explanation

  • Line 4: We retrieve the current runtime of the application using the getRuntime() method of the Runtime class.
  • Line 5: We obtain the maximum memory that the JVM will attempt to use by invoking the maxMemory() method on the current runtime, which was retrieved in line 4.

RELATED TAGS

java
communitycreator

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

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