garbage collection in java

public class Test
{
    static Test m1(Test temp) 
    {
        temp = new Test();
        return temp;
    }
    public static void main(String [] args) 
    {
        Test t1 = new Test();
        Test t2 = m1(t1);  
        Test t3 = new Test();
        t2 = t3;  
          
    }
      
}