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