finalizerclass.java

来自「程序练习中包括书中实例程序代码和练习中要用到的代码,是压缩文件」· Java 代码 · 共 35 行

package examples.classes;

/** A Java class to demonstrate how a finalizer
  * method is defined and used
  */
public class FinalizerClass {

   private int a, b;

   /** Class default constructor method */
   public FinalizerClass() {
      a = 1;
      b = 2;
      System.out.println( "Constructing an object!" );
   }

   /** Class finalizer method
     * @exception Throwable Any exception at all
     */
   protected void finalize() throws Throwable {
      System.out.println( "Doing object cleanup!" );
   }

   /** Test method for the class
     * @param args Not used
     */
   public static void main( String[] args ) {
      FinalizerClass x = new FinalizerClass();
      FinalizerClass y = new FinalizerClass();
      x = null;
      y = null;
      System.gc();
      System.runFinalization();
   }
}