Just after line 5
Just after line 6
Just after line 7 (that is, as the method returns)
Never in this method.
第1题:
A.Justafterline5
B.Justafterline6
C.Justafterline7(thatis,asthemethodreturns)
D.Neverinthismethod.
第2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3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4题:
1. import java.util.*; 2. class ForInTest { 3. static List list = new ArrayList(); 4. 5. static List getList() { return list; } 6. 7. public static void main(String [] args) { 8. list.add("a"); list.add("b"); list.add("c"); 9. // insert code here 10. System.out.print(o); 11. } 12. } 第 9 行插入哪一项将输出 abc?()
第5题:
10. public Object m() { 11. Object o = new Float(3.14F); 12. Object [] oa = new Object[1]; 13. oa[0] = o; 14. o = null; 15. return oa[0]; 16. } When is the Float object, created in line 11, eligible 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 Test { 2. private Demo d; 3. void start() { 4. d = new Demo(); 5. this.takeDemo(d); 6. } 7. 8. void takeDemo(Demo demo) { 9. demo = null; 10. demo = new Demo(); 11. } 12. } When is the Demo object, created on line 3, eligible for garbage collection?()
第8题:
A.Justafterline5.
B.Justafterline6.
C.Justafterline7.
D.Justafterline8(thatis,asthemethodreturns).
第9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10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?()