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单选题
11.rbo = new ReallyBigObject(); 12.//more code here 13.rbo = null; 14./*insert code here*/ Which statement should be placed at line 14 to suggest that the virtual machine expend effort toward recycling the memory used by the objectrbo?()
A
System.gc();
B
Runtime.gc();
C
System.freeMemory();
D
Runtime.getRuntime().growHeap();
E
Runtime.getRuntime().freeMemory();
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更多 “单选题11.rbo = new ReallyBigObject(); 12.//more code here 13.rbo = null; 14./*insert code here*/ Which statement should be placed at line 14 to suggest that the virtual machine expend effort toward recycling the memory used by the objectrbo?()A System.gc();B Runtime.gc();C System.freeMemory();D Runtime.getRuntime().growHeap();E Runtime.getRuntime().freeMemory();” 相关考题
考题
11.rbo = new ReallyBigObject();12.//more code here13.rbo = null;14./*insert code here*/Which statement should be placed at line 14 to suggest that the virtual machine expend effort toward recycling the memory used by the objectrbo?()A.System.gc();B.Runtime.gc();C.System.freeMemory();D.Runtime.getRuntime().growHeap();E.Runtime.getRuntime().freeMemory();
考题
Given:Which three methods, inserted individually at line 14, will correctly complete class Two?()
A.int foo() { /* more code here */ }B.void foo() { /* more code here */ }C.public void foo() { /* more code here */ }D.private void foo() { /* more code here */ }E.protected void foo() { /* more code here */ }
考题
Given:Which method will complete this class?()
A.public int compareTo(Object o){/*more code here*/}B.public int compareTo(Score other){/*more code here*/}C.public int compare(Score s1,Score s2){/*more code here*/}D.public int compare(Object o1,Object o2){/*more code here*/}
考题
class One { void foo() {} } class Two extends One { //insert method here } Which three methods, inserted individually at line 14, will correctly complete class Two?()A、 int foo() { /* more code here */ }B、 void foo() { /* more code here */ }C、 public void foo() { /* more code here */ }D、 private void foo() { /* more code here */ }E、 protected void foo() { /* more code here */ }
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11. List list = // more code here 12. Collections.sort(list, new MyComparator()); Which code will sort this list in the opposite order of the sort in line 12?() A、 Collections.reverseSort(list, new MyComparator());B、 Collections.sort(list, new MyComparator()); list.reverse();C、 Collections.sort(list, new InverseComparator( new MyComparator()));D、 Collections.sort(list, Collections.reverseOrder( new MyComparator()));
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10. class Line { 11. public static class Point { } 12. } 13. 14. class Triangle { 15. // insert code here 16. } Which code, inserted at line 15, creates an instance of the Point class defined in Line?() A、 Point p = new Point();B、 Line.Point p = new Line.Point();C、 The Point class cannot be instatiated at line 15.D、 Line 1 = new Line() ; 1.Point p = new 1.Point();
考题
现有: 1. class Propeller2 { 2. pulolic static void main (String[]args)//add code here? 3. { new Propeller2().topGo(); } 4. 5.void topGo() //add code here? 6. { middleGo(); } 7. 8.void middleGo() //add code here? 9. { go(); System.out.println ("late middle"); } void go() //add code here? 12. {throw new Exception(); } 13. } 为使代码通过编译,需要在哪一行加入声明throws Exception?() A、只在第11行B、在第8行和第11行C、在第5行、第8行和第11行D、在第2行、第5行、第8行和第11行
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public class Team extends java.util.LinkedList { public void addPlayer(Player p) { add(p); } public void compete(Team opponent) { /* more code here */ } } class Player { /* more code here */ } Which two are true?()A、 This code will compile.B、 This code demonstrates proper design of an is-a relationship.C、 This code demonstrates proper design of a has-a relationship.D、 A Java programmer using the Team class could remove Player objects from a Team object.
考题
11. rbo = new ReallyBigObject(); 12. // more code here 13. rbo = null; 14. /* insert code here */ Which statement should be placed at line 14 to suggest that the virtual machine expend effort toward recycling the memory used by the object rbo?() A、 System.gc();B、 Runtime.gc();C、 System.freeMemory();D、 Runtime.getRuntime().growHeap();E、 Runtime.getRuntime().freeMemory();
考题
10. class Line { 11. public class Point { public int x,y; } 12. public Point getPoint() { return new Point(); } 13. } 14. class Triangle { 15. public Triangle() { 16. // insert code here 17. } 18. } Which code, inserted at line 16, correctly retrieves a local instance of a Point object?() A、 Point p = Line.getPoint();B、 Line.Point p = Line.getPoint();C、 Point p = (new Line()).getPoint();D、 Line.Point p = (new Line()).getPoint();
考题
Which three will compile and run without exception?()A、private synchronized Object o;B、void go() {synchronized() { /* code here */ }C、public synchronized void go() { /* code here */ }D、private synchronized(this) void go() { /* code here */ }E、void go() {synchronized(Object.class) { /* code here */ }F、void go() {Object o = new Object();synchronized(o) { /* code here */ }
考题
Given 11.public interface Status { 12./* insert code here */ int MY_VALUE = 10; 13.} Which three are valid on line 12?()A、finalB、staticC、nativeD、publicE、private
考题
多选题Given: 10. class One { 11. void foo() { } 12. } 13. class Two extends One { 14. //insert method here 15. } Which three methods, inserted individually at line 14, will correctly complete class Two?()Apublic void foo() { /* more code here */ }Bprivate void foo() { /* more code here */ }Cprotected void foo() { /* more code here */ }Dint foo() { /* more code here */ }Evoid foo() { /* more code here */ }
考题
多选题class One { void foo() {} } class Two extends One { //insert method here } Which three methods, inserted individually at line 14, will correctly complete class Two?()Aint foo() { /* more code here */ }Bvoid foo() { /* more code here */ }Cpublic void foo() { /* more code here */ }Dprivate void foo() { /* more code here */ }Eprotected void foo() { /* more code here */ }
考题
多选题Given: Which three methods, inserted individually at line 14, will correctly complete class Two?()Aint foo() { /* more code here */ }Bvoid foo() { /* more code here */ }Cpublic void foo() { /* more code here */ }Dprivate void foo() { /* more code here */ }Eprotected void foo() { /* more code here */ }
考题
多选题public class Team extends java.util.LinkedList { public void addPlayer(Player p) { add(p); } public void compete(Team opponent) { /* more code here */ } } class Player { /* more code here */ } Which two are true?()AThis code will compile.BThis code demonstrates proper design of an is-a relationship.CThis code demonstrates proper design of a has-a relationship.DA Java programmer using the Team class could remove Player objects from a Team object.
考题
单选题10. class Line { 11. public static class Point { } 12. } 13. 14. class Triangle { 15. // insert code here 16. } Which code, inserted at line 15, creates an instance of the Point class defined in Line?()A
Point p = new Point();B
Line.Point p = new Line.Point();C
The Point class cannot be instatiated at line 15.D
Line 1 = new Line() ; 1.Point p = new 1.Point();
考题
单选题11. List list = // more code here 12. Collections.sort(list, new MyComparator()); Which code will sort this list in the opposite order of the sort in line 12?()A
Collections.reverseSort(list, new MyComparator());B
Collections.sort(list, new MyComparator()); list.reverse();C
Collections.sort(list, new InverseComparator( new MyComparator()));D
Collections.sort(list, Collections.reverseOrder( new MyComparator()));
考题
多选题Given 11.public interface Status { 12./* insert code here */ int MY_VALUE = 10; 13.} Which three are valid on line 12?()AfinalBstaticCnativeDpublicEprivate
考题
单选题10. class Line { 11. public class Point { public int x,y; } 12. public Point getPoint() { return new Point(); } 13. } 14. class Triangle { 15. public Triangle() { 16. // insert code here 17. } 18. } Which code, inserted at line 16, correctly retrieves a local instance of a Point object?()A
Point p = Line.getPoint();B
Line.Point p = Line.getPoint();C
Point p = (new Line()).getPoint();D
Line.Point p = (new Line()).getPoint();
考题
多选题Which three will compile and run without exception?()Aprivate synchronized Object o;Bvoid go(){ synchronized(){/* code here */}Cpublic synchronized void go(){/* code here */}Dprivate synchronized(this) void go(){/* code here */}Evoid go(){ synchronized(Object.class){/* code here */}Fvoid go(){ Object o = new Object(); synchronized(o){/* code here */}
考题
单选题public class Score implements Comparable { private int wins, losses; public Score(int w, int 1) { wins = w; losses = 1; } public int getWins() { return wins; } public int getLosses() { return losses; } public String toString() { return “”; } // insert code here } Which method will complete this class?()A
public int compareTo(Object o) {/*mode code here*/}B
public int compareTo(Score other) {/*more code here*/}C
public int compare(Score s1,Score s2){/*more code here*/}D
public int compare(Object o1,Object o2){/*more code here*/}
考题
多选题1. public class A { 2. public void method1() { 3. B b=new B(); 4. b.method2(); 5. // more code here 6. } 7. } 1. public class B { 2. public void method2() { 3.C c=new C(); 4. c.method3(); 5. // more code here 6. } 7. } 1. public class C { 2. public void method3() { 3. // more code here 4. } 5. } Given: 25. try { 26. A a=new A(); 27. a.method1(); 28. } catch (Exception e) { 29. System.out.print(”an error occurred”); 30. } Which two are true if a NullPointerException is thrown on line 3 of class C?()AThe application will crash.BThe code on line 29 will be executed.CThe code on line 5 of class A will execute.DThe code on line 5 of class B will execute.EThe exception will be propagated back to line 27.
考题
单选题现有: 1. class Propeller2 { 2. pulolic static void main (String[]args)//add code here? 3. { new Propeller2().topGo(); } 4. 5.void topGo() //add code here? 6. { middleGo(); } 7. 8.void middleGo() //add code here? 9. { go(); System.out.println ("late middle"); } void go() //add code here? 12. {throw new Exception(); } 13. } 为使代码通过编译,需要在哪一行加入声明throws Exception?()A
只在第11行B
在第8行和第11行C
在第5行、第8行和第11行D
在第2行、第5行、第8行和第11行
考题
多选题10. class Foo { 11. static void alpha() { /* more code here */ } 12. void beta() { /* more code here */ } 13. } Which two are true?()AFoo.beta() is a valid invocation of beta().BFoo.alpha() is a valid invocation of alpha().CMethod beta() can directly call method alpha().DMethod alpha() can directly call method beta().
考题
单选题11. rbo = new ReallyBigObject(); 12. // more code here 13. rbo = null; 14. /* insert code here */ Which statement should be placed at line 14 to suggest that the virtual machine expend effort toward recycling the memory used by the object rbo?()A
System.gc();B
Runtime.gc();C
System.freeMemory();D
Runtime.getRuntime().growHeap();E
Runtime.getRuntime().freeMemory();
考题
多选题11. public interface Status { 12. /* insert code here */ int MY_VALUE = 10; 13. } Which three are valid on line 12?()AfinalBstaticCnativeDpublicEprivateFabstractGprotected
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