Java Programming :: Garbage Collections
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When is the B object, created in line 3, eligible for garbage collection?void start() { A a = new A(); B b = new B(); a.s(b); b = null; /* Line 5 */ a = null; /* Line 6 */ System.out.println("start completed"); /* Line 7 */ } -
Where will be the most chance of the garbage collector being invoked?class HappyGarbage01 { public static void main(String args[]) { HappyGarbage01 h = new HappyGarbage01(); h.methodA(); /* Line 6 */ } Object methodA() { Object obj1 = new Object(); Object [] obj2 = new Object[1]; obj2[0] = obj1; obj1 = null; return obj2[0]; } } -
At what point is the Bar object, created on line 6, eligible for garbage collection?class Bar { } class Test { Bar doBar() { Bar b = new Bar(); /* Line 6 */ return b; /* Line 7 */ } public static void main (String args[]) { Test t = new Test(); /* Line 11 */ Bar newBar = t.doBar(); /* Line 12 */ System.out.println("newBar"); newBar = new Bar(); /* Line 14 */ System.out.println("finishing"); /* Line 15 */ } } -
class Test { private Demo d; void start() { d = new Demo(); this.takeDemo(d); /* Line 7 */ } /* Line 8 */ void takeDemo(Demo demo) { demo = null; demo = new Demo(); } } -
public class X{public static void main(String [] args){X x = new X();X x2 = m1(x); /* Line 6 */X x4 = new X();x2 = x4; /* Line 8 */doComplexStuff();}static X m1(X mx){mx = new X();return mx;}}After line 8 runs. how many objects are eligible for garbage collection?
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public Object m(){Object o = new Float(3.14F);Object [] oa new Object[l];oa[0] = o; /* Line 5 */o = null; /* Line 6 */oa[0] = null; /* Line 7 */return o; /* Line 8 */}When is the Float object, created in line 3, eligible for garbage collection?
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What allows the programmer to destroy an object x?
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