Which is the earliest line in the following code after which the object created on the line marked (0) will be a candidate for being garbage collected, assuming no compiler optimizations are done? () public class Q76a9 { static String f() { String a = "hello"; String b = "bye"; // (0) String c = b + "!"; // (1) String d = b; b = a; // (2) d = a; // (3) return c; // (4) } public static void main(String args[]) { String msg = f(); System.out.println(msg); // (5) } }
第1题:
A.Line 5
B.Line 6
C.Line 7
D.Line 8
E.Line 9
F.Line 10
第2题:
11.public void genNumbers(){ 12.ArrayList numbers=new ArrayList(); 13.for(inti=0;i<10;i++){ 14.intvalue=i*((int)Math.random()); 15.IntegerintObj=newInteger(value); 16.numbers.add(intObj); 17.} 18.System.out.println(numbers); 19.} Which line of code marks the earliest point that an object referenced by intObj becomes a candidate for garbagec ollection?()
第3题:
11.public void genNumbers(){12.ArrayList numbers=new ArrayList();13.for(inti=0;i14.intvalue=i*((int)Math.random());15.IntegerintObj=newInteger(value);16.numbers.add(intObj);17.}18.System.out.println(numbers);19.}Which line of code marks the earliest point that an object referenced by intObj becomes a candidate for garbagec ollection?()
A.Line16
B.Line17
C.Line18
D.Line19
E.The object is NOT a candidate for garbage collection.
第4题:
1.public class GC{ 2.private Objec to; 3.private void doSomethingElse(Object obj){o=obj;} 4.public void doSomething(){ 5.Object o=new Object(); 6.doSomethingElse(o); 7.o=new Object(); 8.doSomethingElse(null); 9.o=null; 10.} 11.} When the doSomething method is called,after which line does the Object created in line 5 become available for garbage collection?()
第5题:
1. public class GC { 2. private Object o; 3. private void doSomethingElse(Object obj) { o = obj; } 4. public void doSomething() { 5. Object o = new Object(); 6. doSomethingElse(o); 7. o = new Object(); 8. doSomethingElse(null); 9.o=null; 10. } 11. } When the doSomething method is called, after which line does the Object created in line 5 become available for garbage collection?()
第6题:
public class X { public object m () { object o = new float (3.14F); object oa = new object [1]; oa[0]= o; o = null; return oa[0]; } } When is the float object created in line 3, eligible for garbage collection?()
第7题:
1. class TestA { 2. TestB b; 3. TestA() { 4. b = new TestB(this); 5. } 6. } 7. class TestB { 8. TestA a; 9. TestB(TestA a) { 10. this.a = a; 11. } 12. } 13. class TestAll { 14. public static void main (String args[]) { 15. new TestAll().makeThings(); 16. // ...code continues on 17. } 18. void makeThings() { 19. TestA test = new TestA(); 20. } 21. } Which two statements are true after line 15, before main completes?()
第8题:
1.public class GC{2.private Objec to;3.private void doSomethingElse(Object obj){o=obj;}4.public void doSomething(){5.Object o=new Object();6.doSomethingElse(o);7.o=new Object();8.doSomethingElse(null);9.o=null;10.}11.}When the doSomething method is called,after which line does the Object created in line 5 become available for garbage collection?()
A.Line5
B.Line6
C.Line7
D.Line8
E.Line9
F.Line10
第9题:
11. public void genNumbers() { 12. ArrayList numbers = new ArrayList(); 13. for (int i=0; i<10; i++) { 14. int value = i * ((int) Math.random()); 15. Integer intObj = new Integer(value); 16. numbers.add(intObj); 17. } 18. System.out.println(numbers); 19. } Which line of code marks the earliest point that an object referenced by intObj becomes a candidate for garbage collection?()
第10题:
1. public class X ( 2. public object m () { 3. object o = new float (3.14F); 4. object [] oa = new object [1]; 5. oa[0]= o; 6. o = null; 7. return oa[0]; 8. } 9. } When is the float object created in line 3, eligible for garbage collection?()