What is Runtime.maxMemory() in Java?

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.

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