Update b11_RuntimeExample.java

Author: SolisDynamics

examples/concurrency/b11_RuntimeExample.java

@@ -1,76 +1,95 @@
-package a1_java.lang;  
-import java.io.*;  
-import java.util.Map;  
-public class b11_RuntimeExample {  
-    @SuppressWarnings({ "removal", "deprecation" })
-	public static void main(String[] args) {  
+package a1_java.lang;
+
+import java.io.*;
+import java.util.Map;
+
+public class b11_RuntimeExample {
+
+    @SuppressWarnings({"removal", "deprecation"})
+    public static void main(String[] args) {
         // Method 1: Get Runtime Instance  
         // This method returns the current runtime object, allowing access to JVM runtime methods  
-        Runtime runtime = Runtime.getRuntime();  
-        System.out.println("1. Runtime Instance obtained successfully.");  
+        Runtime runtime = Runtime.getRuntime();
+        System.out.println("1. Runtime Instance obtained successfully.");
+
         // Method 2 & 3: Memory Management Methods  
         // These methods provide information about JVM memory usage  
-        long totalMemory = runtime.totalMemory();  
-        long freeMemory = runtime.freeMemory();  
-        System.out.println("2. Total Memory: " + totalMemory + " bytes");  
-        System.out.println("3. Free Memory: " + freeMemory + " bytes");  
+        long totalMemory = runtime.totalMemory();
+        long freeMemory = runtime.freeMemory();
+        System.out.println("2. Total Memory: " + totalMemory + " bytes");
+        System.out.println("3. Free Memory: " + freeMemory + " bytes");
+
         // Method 4: Garbage Collection  
         // Suggests the JVM to run garbage collection process  
-        runtime.gc();  
-        System.out.println("4. Garbage Collection suggested.");  
+        runtime.gc();
+        System.out.println("4. Garbage Collection suggested.");
+
         // Method 5: Run Finalization  
         // Suggests running pending finalizer methods  
-        runtime.runFinalization();  
-        System.out.println("5. Finalization process suggested.");  
+        runtime.runFinalization();
+        System.out.println("5. Finalization process suggested.");
+
         // Method 7 & 8 & 9: Execute External Processes  
-        try {  
+        try {
             // Execute a simple command and read its output  
-            Process process1 = runtime.exec("echo Hello, Runtime!");  
-            String output1 = readProcessOutput(process1);  
-            System.out.println("7. Simple command execution result: " + output1);  
+            Process process1 = runtime.exec("echo Hello, Runtime!");
+            String output1 = readProcessOutput(process1);
+            System.out.println("7. Simple command execution result: " + output1);
+
             // Execute a command array and read its output  
-            String[] cmdArray = {"cmd", "/c", "dir"};  
-            Process process2 = runtime.exec(cmdArray);  
-            String output2 = readProcessOutput(process2);  
-         System.out.println("8. Command array execution result length: " + output2.length());  
+            String[] cmdArray = {"cmd", "/c", "dir"};
+            Process process2 = runtime.exec(cmdArray);
+            String output2 = readProcessOutput(process2);
+            System.out.println("8. Command array execution result length: " + output2.length());
+
             // Execute command with environment variables and read its output  
-            String[] envp = {"PATH=" + System.getenv("PATH")};  
-            Process process3 = runtime.exec("echo %PATH%", envp);  
-            String output3 = readProcessOutput(process3);  
-      System.out.println("9. Command with environment variables execution result: " + output3);  
-        } catch (IOException e) {  
-            System.err.println("Error executing processes: " + e.getMessage()); }  
+            String[] envp = {"PATH=" + System.getenv("PATH")};
+            Process process3 = runtime.exec("echo %PATH%", envp);
+            String output3 = readProcessOutput(process3);
+            System.out.println("9. Command with environment variables execution result: " + output3);
+        } catch (IOException e) {
+            System.err.println("Error executing processes: " + e.getMessage());
+        }
+
         // Method 10: Add Shutdown Hook  
         // Registers a thread to be executed when JVM is shutting down  
-        Thread shutdownHook = new Thread(() -> {  
-            System.out.println("10. Shutdown hook executed: Performing cleanup."); });  
-        runtime.addShutdownHook(shutdownHook);  
+        Thread shutdownHook = new Thread(() -> {
+            System.out.println("10. Shutdown hook executed: Performing cleanup.");
+        });
+        runtime.addShutdownHook(shutdownHook);
+
         // Method 11: Remove Shutdown Hook (demonstration)  
-        boolean hookRemoved = runtime.removeShutdownHook(shutdownHook);  
-        System.out.println("11. Shutdown hook removal status: " + hookRemoved);  
+        boolean hookRemoved = runtime.removeShutdownHook(shutdownHook);
+        System.out.println("11. Shutdown hook removal status: " + hookRemoved);
+
         // Method 12: Get Environment Variables  
         // Retrieves all environment variables  
-        Map<String, String> environmentVariables = System.getenv();  
-        System.out.println("12. Environment Variables:");  
-        environmentVariables.forEach((key, value) ->  
-                System.out.println(key + " = " + value) );  
+        Map<String, String> environmentVariables = System.getenv();
+        System.out.println("12. Environment Variables:");
+        environmentVariables.forEach((key, value) ->
+                System.out.println(key + " = " + value));
+
         // Method 13: toString Representation  
         // Returns a string representation of the Runtime object  
-        String runtimeString = runtime.toString();  
-        System.out.println("13. Runtime toString: " + runtimeString);  
+        String runtimeString = runtime.toString();
+        System.out.println("13. Runtime toString: " + runtimeString);
+
         // Method 14: Available Processors  
         // Returns the number of processors available to the JVM  
-        int processors = runtime.availableProcessors();  
-        System.out.println("14. Available Processors: " + processors); }  
+        int processors = runtime.availableProcessors();
+        System.out.println("14. Available Processors: " + processors);
+    }
+
     // Utility method to read output from a Process  
-    private static String readProcessOutput(Process process) throws IOException {  
+    private static String readProcessOutput(Process process) throws IOException {
         // Read the output of the process  
-        try (BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()))) {  
-            StringBuilder output = new StringBuilder();  
-            String line;  
-            while ((line = reader.readLine()) != null) {  
-                output.append(line).append("\n"); }  
-            return output.toString().trim();  
-		} 
-	} 
+        try (BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()))) {
+            StringBuilder output = new StringBuilder();
+            String line;
+            while ((line = reader.readLine()) != null) {
+                output.append(line).append("\n");
+            }
+            return output.toString().trim();
+        }
+    }
 }