Java Runtime class
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Java Runtime
class is used to interact with java runtime environment. Java Runtime class
provides methods to execute a process, invoke GC, get total and free memory
etc. There is only one instance of java.lang.Runtime class is available for one
java application.
Example 01:
package com.java.Multi_threading;
public class RuntimeExample {
public static void main(String[] args) {
// Get the singleton instance of the Runtime class
Runtime runtime = Runtime.getRuntime();
// Get information about memory usage
long freeMemory = runtime.freeMemory();
long totalMemory = runtime.totalMemory();
long maxMemory = runtime.maxMemory();
System.out.println("Free Memory: " + freeMemory + " bytes");
System.out.println("Total Memory: " + totalMemory + " bytes");
System.out.println("Max Memory: " + maxMemory + " bytes");
// Execute an external process (e.g., listing files in the current directory)
try {
Process process = runtime.exec("ls");
int exitCode = process.waitFor(); // Wait for the process to finish
System.out.println("External process exited with code: " + exitCode);
} catch (Exception e) {
e.printStackTrace();
}
// Register a shutdown hook
runtime.addShutdownHook(new Thread(() -> {
System.out.println("Shutdown hook executed");
}));
// Demonstrate halting the JVM (commented out for safety)
// runtime.halt(0);
}
}
Labels: Java
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