garbagecollector.java

// Java program to demonstrate requesting 
// JVM to run Garbage Collector
class Test
{
    public static void main(String[] args) throws InterruptedException
    {
        Test t1 = new Test();
        Test t2 = new Test();
          
        // Nullifying the reference variable
        t1 = null;
          
        // requesting JVM for running Garbage Collector
        System.gc();
          
        // Nullifying the reference variable
        t2 = null;
          
        // requesting JVM for running Garbage Collector
        Runtime.getRuntime().gc();
      
    }
      
    @Override
    // finalize method is called on object once 
    // before garbage collecting it
    protected void finalize() throws Throwable
    {
        System.out.println("Garbage collector called");
        System.out.println("Object garbage collected : " + this);
    }
}