一个利用System.gc和finalize研究Java垃圾回收机制的练习

package basic;
public class finalizeTest {
  private String name;
  public void finalize(){
    System.out.println("finalize called: " + this.name);
    System.out.println("Thread id in finalize: " + Thread.currentThread().getId());
  }
  public finalizeTest(String name){
    this.name = name;
  }
  public static void main(String[] args) {
    System.out.println("Main Thread id: " + Thread.currentThread().getId());
    finalizeTest test = new finalizeTest("Jerry");
    test.hashCode();
    /* 这个新创建出来的对象实例没有任何变量指向它，因此System.gc()调用之后就会被回收 
     * 而且能发现Scala实例执行finalize方法的线程并不是主线程，打印出的线程ID不一样
     * */
    new finalizeTest("Scala");
    System.gc();
  }
}

Main Thread id: 1
finalize called: Scala
Thread id in finalize: 3