An exercise in Java garbage collection with System.gc and Finalize

The source code:

package basic;

public class finalizeTest {

	private String name;
	public void finalize(a){
		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();
		/* The newly created object instance does not have any variables pointing to it, so it will be recycled after system.gc () is called * and you can see that the Scala instance executes finalize method on a thread that is not the main thread, so the printed thread ID is different * */
		new finalizeTest("Scala"); System.gc(); }}Copy the code

Printout:

Main Thread id: 1
finalize called: Scala
Thread id in finalize: 3
Copy the code