Source Code : This class determines the version of the Java Virtual Machine.

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This class determines the version of the Java Virtual Machine.

       
//package com.javadocking.util;

/**
 * This class determines the version of the Java Virtual Machine.
 * 
 * @author Heidi Rakels.
 */
public class JvmVersionUtil {

  // Static fields.

  /** The integer for java 1.3 versions of the JVM. */
  public static final int VERSION_3_OR_LESS = 3;
  /** The integer for java 5 versions of the JVM. */
  public static final int VERSION_4_or_5 = 4;
  /** The integer for java 6 versions of the JVM. */
  public static final int VERSION_6_OR_MORE = 6;

  /** The float for java 4 versions of the JVM. */
  private static final float VERSION_4 = 1.4f;
  /** The integer for java 6 versions of the JVM. */
  private static final float VERSION_6 = 1.6f;

  // Public static methods.

  /**
   * Gets the version of the JVM.
   * 
   * @return The integer that corresponds with the version of the JVM. This
   *         can be VERSION_3_OR_LESS,VERSION_4_or_5, VERSION_6_OR_MORE.
   * @throws IllegalStateException
   *             If the system property <code>java.version</code> does not
   *             start with a x.x. x should be a number.
   */
  public static int getVersion() {

    // Get the system property java.vm.version.
    String jVersion = System.getProperty("java.version");

    // Get the version number.
    int pointPosition = jVersion.indexOf(".");
    if (pointPosition > 0) {
      if (jVersion.length() >= pointPosition + 2) {
        String version = jVersion.substring(0, pointPosition + 2);

        try {
          float versionNumber = Float.parseFloat(version);
          if (versionNumber < VERSION_4) {
            return VERSION_3_OR_LESS;
          }
          if (versionNumber < VERSION_6) {
            return VERSION_4_or_5;
          } else {
            return VERSION_6_OR_MORE;
          }
        } catch (NumberFormatException exception) {
          throw new IllegalStateException("Unknown java version ["
              + jVersion + "].");
        }
      }
    }

    throw new IllegalStateException("Unknown java version [" + jVersion
        + "].");

  }

  // Test.

  // public static void main(String[] args) {
  //
  // String version = System.getProperty("java.vm.version");
  // System.out.println("Version number: " + getVersion());
  // System.out.println("Version string: " + version);
  //
  // }

  // Private constructor.

  private JvmVersionUtil() {
  }
}

   
    
    
    
    
    
    
  

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