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多选题
Given a pre-generics implementation of a method: What three changes allow the class to be used with generics and avoid an unchecked warning?()
A
Remove line 14.
B
Replace line 14 with "int i = iter.next();".
C
Replace line 13 with "for (int i : intList) {".
D
Replace line 13 with "for (Iterator iter : intList) {".
E
Replace the method declaration with "sum(List
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更多 “多选题Given a pre-generics implementation of a method: What three changes allow the class to be used with generics and avoid an unchecked warning?()ARemove line 14.BReplace line 14 with "int i = iter.next();".CReplace line 13 with "for (int i : intList) {".DReplace line 13 with "for (Iterator iter : intList) {".EReplace the method declaration with "sum(List intList)". ” 相关考题
考题
public static void main(String[]args){12.Object obj=new int[]{1,2,3};13.int[] someArray=(int[])obj;14.for(inti:someArray)System.out.print(i+)15.}What is the result?()
A.123B.Compilation fails because of an error in line 12.C.Compilation fails because of an error in line 13.D.Compilation fails because of an error in line 14.E.A ClassCastException is thrown at runtime.
考题
Given:11.publicvoidgenNumbers(){12.ArrayListnumbers=newArrayList();13.for(inti=0;i10;i++){14.intvalue=i*((int)Math.random());15.IntegerintObj=newInteger(value);16.numbers.add(intObj);17.}18.System.out.println(numbers);19.}WhichlineofcodemarkstheearliestpointthatanobjectreferencedbyintObjbecomesacandidateforgarbagecollection?()A.Line19B.TheobjectisNOTacandidateforgarbagecollection.C.Line17D.Line16E.Line18
考题
11. public static void main(String[] args) { 12. Object obj =new int[] { 1,2,3 }; 13. int[] someArray = (int[])obj; 14. for (int i: someArray) System.out.print(i +“ “) 15. } What is the result? ()A、 1 2 3B、 Compilation fails because of an error in line 12.C、 Compilation fails because of an error in line 13.D、 Compilation fails because of an error in line 14.E、 A ClassCastException is thrown at runtime.
考题
public class test ( public static void main (String args) { int i = 0xFFFFFFF1; int j = ~i; } ) What is the decimal value of j at line 5?()A、 0B、 1C、 14D、 –15E、 An error at line 3 causes compilation to fail.F、 An error at line 4 causes compilation to fail.
考题
1. public class Target { 2. private int i = 0; 3. public int addOne() { 4. return ++i; 5. } 6. } And: 1. public class Client { 2. public static void main(String[] args) { 3. System.out.println(new Target().addOne()); 4. } 5. } Which change can you make to Target without affecting Client?() A、 Line 4 of class Target can be changed to return i++;B、 Line 2 of class Target can be changed to private int i = 1;C、 Line 3 of class Target can be changed to private int addOne() {D、 Line 2 of class Target can be changed to private Integer i = 0;
考题
class Super { public int getLenght( ) { return 4; } } public class Sub extends Super { public long getLenght( ) { return 5; } public static void main(String[] args) { Super sooper = new Super( ); Sub sub = new Sub( ); System.out.println( sooper.getLenght( ) + “,” + sub.getLenght( ) ); } } What is the output?()A、 Just after line 13.B、 Just after line 14.C、 Just after line 15.D、 Just after line 16 (that is, as the method returns).
考题
1. class Super { 2. private int a; 3. protected Super(int a) { this.a = a; } 4. } ..... 11. class Sub extends Super { 12. public Sub(int a) { super(a); } 13. public Sub() { this.a= 5; } 14. } Which two, independently, will allow Sub to compile?()A、 Change line 2 to: public int a;B、 Change line 2 to: protected int a;C、 Change line 13 to: public Sub() { this(5); }D、 Change line 13 to: public Sub() { super(5); }E、 Change line 13 to: public Sub() { super(a); }
考题
对于下列代码: 1) class Person { 2} public void printValue(int i, int j) {//... } 3} public void printValue(int i){//... } 4} } 5) public class Teacher extends Person { 6} public void printValue( ) {//... } 7} public void printValue(int i) {//...} 8} public static void main(String args[]){ 9} Person t = new Teacher( ); 10} t.printValue(10); 11} } 第10行语句将调用哪行语句?()A、 line 2B、 line 3C、 line 6D、 line 7
考题
package foo; import java.util.Vector; private class MyVector extends Vector { int i = 1; public MyVector() { i = 2; } } public class MyNewVector extends MyVector { public MyNewVector() { i = 4; } public static void main(String args[]) { MyVector v = new MyNewVector(); } } What is the result?()A、 Compilation succeeds.B、 Compilation fails because of an error at line 5.C、 Compilation fails because of an error at line 6.D、 Compilation fails because of an error at line 14.E、 Compilation fails because of an error at line 17.
考题
1.public class test ( 2.public static void main (String args[]) { 3.int i = 0xFFFFFFF1; 4.int j = ~i; 5. 6.} 7.) What is the decimal value of j at line 5?() A、 0B、 1C、 14D、 –15E、 An error at line 3 causes compilation to fail.F、 An error at line 4 causes compilation to fail.
考题
1. interface foo { 2. int k = 0; 3. } 4. 5. public class test implements Foo ( 6. public static void main(String args[]) ( 7. int i; 8. Test test = new test (); 9. i= test.k; 10.i= Test.k; 11.i= Foo.k; 12.) 13.) 14. What is the result?() A、 Compilation succeeds.B、 An error at line 2 causes compilation to fail.C、 An error at line 9 causes compilation to fail.D、 An error at line 10 causes compilation to fail.E、 An error at line 11 causes compilation to fail.
考题
11.public static void main(String[]args){ 12.Object obj=new int[]{1,2,3}; 13.int[] someArray=(int[])obj; 14.for(inti:someArray)System.out.print(i+"") 15.} What is the result?()A、123B、Compilation fails because of an error in line 12.C、Compilation fails because of an error in line 13.D、Compilation fails because of an error in line 14.E、A ClassCastException is thrown at runtime.
考题
1) class Person { 2) public void printValue(int i, int j) {/*…*/ } 3) public void printValue(int i){/*...*/ } 4) } 5) public class Teacher extends Person { 6) public void printValue() {/*...*/ } 7) public void printValue(int i) {/*...*/} 8) public static void main(String args[]){ 9) Person t = new Teacher(); 10) t.printValue(10); 11) } 12) } Which method will the statement on line 10 call? () A、 on line 2B、 on line 3C、 on line 6D、 on line 7
考题
interface foo { int k = 0; } public class test implements Foo ( public static void main(String args) ( int i; Test test = new test (); i= test.k; i= Test.k; i= Foo.k; ) ) What is the result? ()A、 Compilation succeeds.B、 An error at line 2 causes compilation to fail.C、 An error at line 9 causes compilation to fail.D、 An error at line 10 causes compilation to fail.E、 An error at line 11 causes compilation to fail.
考题
public class TestFive { private int x; public void foo() { int current = x; x = current + 1; } public void go() { for(int i=0;i5;i++) { new Thread() { public void run() { foo(); System.out.print(x + “, “); } }.start(); }}} Which two changes, taken together, would guarantee the output: 1, 2, 3, 4, 5, ?()A、 Move the line 12 print statement into the foo() method.B、 Change line 7 to public synchronized void go() {.C、 Change the variable declaration on line 3 to private volatile int x;.D、 Wrap the code inside the foo() method with a synchronized( this ) block.E、 Wrap the for loop code inside the go() method with a synchronized block synchronized(this) { // for loop code here }.
考题
Given: 11. public void genNumbers() { 12. ArrayList numbers = new ArrayList(); 13. for (int i=0; i10; 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?()A、 Line 19B、 The object is NOT a candidate for garbage collection.C、 Line 17D、 Line 16E、 Line 18
考题
You work as an application developer at Certkiller .com. Certkiller .com has instructed you to create a class named MetricFormula. This class will be used to compare MetricUnit and EnglishUnit objects.The MetricFormula is currently defined as follows (Line numbers are used for reference purposes only): 1. public class MetricFormula2. { 3. 4. } You need to ensure that the MetricFormula class can be used to compare the required objects. What should you do? ()A、 Add the following code on line 1: : IComparable {B、 Add the following code on line 1: : IComparer {C、 Add the following code on line 3: public int Compare (object x, object y) {// implementation code }D、 Add the following code on line 3: public int CompareTo (object obj) {// implementation code }
考题
单选题interface foo { int k = 0; } public class test implements Foo ( public static void main(String args) ( int i; Test test = new test (); i= test.k; i= Test.k; i= Foo.k; ) ) What is the result? ()A
Compilation succeeds.B
An error at line 2 causes compilation to fail.C
An error at line 9 causes compilation to fail.D
An error at line 10 causes compilation to fail.E
An error at line 11 causes compilation to fail.
考题
多选题You work as an application developer at Certkiller .com. Certkiller .com has instructed you to create a class named MetricFormula. This class will be used to compare MetricUnit and EnglishUnit objects.The MetricFormula is currently defined as follows (Line numbers are used for reference purposes only): 1. public class MetricFormula2. { 3. 4. } You need to ensure that the MetricFormula class can be used to compare the required objects. What should you do? ()AAdd the following code on line 1: : IComparable {BAdd the following code on line 1: : IComparer {CAdd the following code on line 3: public int Compare (object x, object y) {// implementation code }DAdd the following code on line 3: public int CompareTo (object obj) {// implementation code }
考题
单选题1) class Person { 2) public void printValue(int i, int j) {/*…*/ } 3) public void printValue(int i){/*...*/ } 4) } 5) public class Teacher extends Person { 6) public void printValue() {/*...*/ } 7) public void printValue(int i) {/*...*/} 8) public static void main(String args[]){ 9) Person t = new Teacher(); 10) t.printValue(10); 11) } 12) } Which method will the statement on line 10 call? ()A
on line 2B
on line 3C
on line 6D
on line 7
考题
多选题1. class Super { 2. private int a; 3. protected Super(int a) { this.a = a; } 4. } ..... 11. class Sub extends Super { 12. public Sub(int a) { super(a); } 13. public Sub() { this.a= 5; } 14. } Which two, independently, will allow Sub to compile?()AChange line 2 to: public int a;BChange line 2 to: protected int a;CChange line 13 to: public Sub() { this(5); }DChange line 13 to: public Sub() { super(5); }EChange line 13 to: public Sub() { super(a); }
考题
单选题11. public static void main(String[] args) { 12. Object obj =new int[] { 1,2,3 }; 13. int[] someArray = (int[])obj; 14. for (int i: someArray) System.out.print(i +“ “) 15. } What is the result? ()A
1 2 3B
Compilation fails because of an error in line 12.C
Compilation fails because of an error in line 13.D
Compilation fails because of an error in line 14.E
A ClassCastException is thrown at runtime.
考题
多选题1) class Person { 2) public void printValue(int i, int j) {/*…*/ } 3) public void printValue(int i){/*...*/ } 4) } 5) public class Teacher extends Person { 6) public void printValue() {/*...*/ } 7) public void printValue(int i) {/*...*/} 8) public static void main(String args[]){ 9) Person t = new Teacher(); 10) t.printValue(10); 11) } 12) } Which method will the statement on line 10 call?()Aon line 2Bon line 3Con line 6Don line 7
考题
单选题public class test ( public static void main (String args) { int i = 0xFFFFFFF1; int j = ~i; } ) What is the decimal value of j at line 5?()A
0B
1C
14D
–15E
An error at line 3 causes compilation to fail.F
An error at line 4 causes compilation to fail.
考题
多选题public class TestFive { private int x; public void foo() { int current = x; x = current + 1; } public void go() { for(int i=0;i5;i++) { new Thread() { public void run() { foo(); System.out.print(x + “, “); } }.start(); }}} Which two changes, taken together, would guarantee the output: 1, 2, 3, 4, 5, ?()AMove the line 12 print statement into the foo() method.BChange line 7 to public synchronized void go() {.CChange the variable declaration on line 3 to private volatile int x;.DWrap the code inside the foo() method with a synchronized( this ) block.EWrap the for loop code inside the go() method with a synchronized block synchronized(this) { // for loop code here }.
考题
单选题Given: 11. public static void main(String[] args) { 12. Object obj = new int[] { 1, 2, 3 }; 13. int[] someArray = (int[])obj; 14. for (int i : someArray) System.out.print(i + " "); 15. } What is the result? ()A
Compilation fails because of an error in line 13.B
A ClassCastException is thrown at runtime.C
1 2 3D
Compilation fails because of an error in line 14.E
Compilation fails because of an error in line 12.
考题
单选题class Super { public int getLenght( ) { return 4; } } public class Sub extends Super { public long getLenght( ) { return 5; } public static void main(String[] args) { Super sooper = new Super( ); Sub sub = new Sub( ); System.out.println( sooper.getLenght( ) + “,” + sub.getLenght( ) ); } } What is the output?()A
Just after line 13.B
Just after line 14.C
Just after line 15.D
Just after line 16 (that is, as the method returns).
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