When the a, and b are eligible for GC?

[bujin wang]

public class Test {
    public static void main(String[] args) {
        new Test().testAll();
        // ... Code continues on
    }
 
    public void testAll(){
        TestA a = new TestA();
    }
}
 
class TestA{
    TestB b;
    public TestA(){
        this.b = new TestB();
    }
}
 
class TestB{
    TestA a;
 
    public TestB(){
        this.a = new TestA();
    }
}  

[Adrian Pang]

SCJP is properly a better forum for this post, but the variable is available for GC as soon as there are no more reference to it. The a inside testB is gone with the instance of testB is gone; which is the case when the instance of TestA is gone; which is the case when testAll completes. After testAll, a and b are candidates for GC.