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多选题
10.publicclassBar{ 11.staticvoidfoo(int...x){ 12.//insertcodehere 13.} 14.} Which two code fragments,inserted independently at line1 2,will allow the class to compile()
A
foreach(x)System.out.println(z);
B
for(intz:x)System.out.println(z);
C
while(x.hasNext())System.out.println(x.next());
D
for(inti=0;i
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publicclassBar{11.staticvoidfoo(int...x){12.//insertcodehere13.}14.}Which two code fragments,inserted independently at line1 2,will allow the class to compile()
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Given:Which two, inserted at line 11, will allow the code to compile?()
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10.publicclassBar{ 11.staticvoidfoo(int...x){ 12.//insertcodehere 13.} 14.} Which two code fragments,inserted independently at line1 2,will allow the class to compile()A、foreach(x)System.out.println(z);B、for(intz:x)System.out.println(z);C、while(x.hasNext())System.out.println(x.next());D、for(inti=0;i
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10. public class Bar { 11.static void foo(int...x) { 12. // insert code here 13. } 14. } Which two code fragments, inserted independently at line 12, will allow the class to compile?()A、 foreach(x) System.out.println(z);B、 for(int z : x) System.out.println(z);C、 while( x.hasNext()) System.out.println( x.next());D、 for( int i=0; i x.length; i++ ) System.out.println(x[i]);
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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); }
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Which statements, when inserted at the indicated position in the following code, will cause a runtime exception when attempting to run the program?() class A {} class B extends A {} class C extends A {} public class Q3ae4 { public static void main(String args[]) { A x = new A(); B y = new B(); C z = new C(); // insert statement here } } A、x = y;B、z = x;C、y = (B) x;D、z = (C) y;E、y = (A) y;
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10. class Nav{ 11. public enum Direction { NORTH, SOUTH, EAST, WEST } 12. } 13. public class Sprite{ 14. // insert code here 15. } Which code, inserted at line 14, allows the Sprite class to compile?() A、 Direction d = NORTH;B、 Nav.Direction d = NORTH;C、 Direction d = Direction.NORTH;D、 Nav.Direction d = Nav.Direction.NORTH;
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package sun.scjp; public enum Color { RED, GREEN, BLUE } package sun.beta; // insert code here public class Beta { Color g = GREEN; public static void main( String[] argv) { System.out.println( GREEN); } } The class Beta and the enum Color are in different packages. Which two code fragments, inserted individually at line 2 of the Beta declaration, will allow this code to compile?()A、 import sun.scjp.Color.*;B、 import static sun.scjp.Color.*;C、 import sun.scjp.Color; import static sun.scjp.Color.*;D、 import sun.scjp.*; import static sun.scjp.Color.*;E、 import sun.scjp.Color; import static sun.scjp.Color.GREEN;
考题
10. public class Foo implements java.io.Serializable { 11. private int x; 12. public int getX() { return x; } 12.publicFoo(int x){this.x=x; } 13. private void writeObject( ObjectOutputStream s) 14. throws IOException { 15. // insert code here 16. } 17. } Which code fragment, inserted at line 15, will allow Foo objects to be correctly serialized and deserialized?() A、 s.writeInt(x);B、 s.serialize(x);C、 s.writeObject(x);D、 s.defaultWriteObject();
考题
10. interface Foo {} 11. class Alpha implements Foo {} 12. class Beta extends Alpha {} 13. class Delta extends Beta { 14. public static void main( String[] args) { 15. Beta x = new Beta(); 16. // insert code here 17. } 18. } Which code, inserted at line 16, will cause a java.lang.ClassCastException?() A、 Alpha a = x;B、 Foo f= (Delta)x;C、 Foo f= (Alpha)x;D、 Beta b = (Beta)(Alpha)x;
考题
14. DateFormat df; 15. Date date = new Date(); 16. //insert code here 17. String s = df.format( date); Which two,inserted independently at line 16, allow the code to compile?()A、 df= new DateFormat();B、 df= Date.getFormatter();C、 df= date.getFormatter();D、 df= date.getDateFormatter();E、df = DateFormat.getDateInstance();F、 df= DateFormat.getInstance();
考题
Which two code fragments are most likely to cause a StackOverflowError?()A、int []x = {1,2,3,4,5};for(int y = 0; y 6; y++) System.out.println(x[y]);B、static int[] x = {7,6,5,4};static { x[1] = 8;x[4] = 3; }C、for(int y = 10; y 10; y++)doStuff(y);D、void doOne(int x) { doTwo(x); }void doTwo(int y) { doThree(y); }void doThree(int z) { doTwo(z); }E、for(int x = 0; x 1000000000; x++) doStuff(x);F、void counter(int i) { counter(++i); }
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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?()A、 public void foo() { /* more code here */ }B、 private void foo() { /* more code here */ }C、 protected void foo() { /* more code here */ }D、 int foo() { /* more code here */ } E、 void foo() { /* more code here */ }
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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 */ }
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单选题10. interface Foo {} 11. class Alpha implements Foo {} 12. class Beta extends Alpha {} 13. class Delta extends Beta { 14. public static void main( String[] args) { 15. Beta x = new Beta(); 16. // insert code here 17. } 18. } Which code, inserted at line 16, will cause a java.lang.ClassCastException?()A
Alpha a = x;B
Foo f= (Delta)x;C
Foo f= (Alpha)x;D
Beta b = (Beta)(Alpha)x;
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多选题Given: 11. // insert code here 12. private N min, max; 13. public N getMin() { return min; } 14. public N getMax() { return max; } 15. public void add(N added) { 16. if (min == null || added.doubleValue() max.doubleValue()) 19. max = added; 20. } 21. } Which two, inserted at line 11, will allow the code to compile?()AABBCCDDEEFF
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多选题Which two code fragments are most likely to cause a StackOverflowError?()Aint []x = {1,2,3,4,5};for(int y = 0; y 6; y++) System.out.println(x[y]);Bstatic int[] x = {7,6,5,4};static { x[1] = 8;x[4] = 3; }Cfor(int y = 10; y 10; y++)doStuff(y);Dvoid doOne(int x) { doTwo(x); }void doTwo(int y) { doThree(y); }void doThree(int z) { doTwo(z); }Efor(int x = 0; x 1000000000; x++) doStuff(x);Fvoid counter(int i) { counter(++i); }
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多选题10. public class Bar { 11.static void foo(int...x) { 12. // insert code here 13. } 14. } Which two code fragments, inserted independently at line 12, will allow the class to compile?()Aforeach(x) System.out.println(z);Bfor(int z : x) System.out.println(z);Cwhile( x.hasNext()) System.out.println( x.next());Dfor( int i=0; i x.length; i++ ) System.out.println(x[i]);
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多选题Given: Which four code fragments, inserted independently at line 7, will compile?()Apublic void m1() { }Bprotected void m1() { }Cprivate void m1() { }Dvoid m2() { }Epublic void m2() { }Fprotected void m2() { }
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多选题10. abstract public class Employee { 11. protected abstract double getSalesAmount(); 12. public double getCommision() { 13. return getSalesAmount() * 0.15; 14. } 15. } 16. class Sales extends Employee { 17. // insert method here 18. } Which two methods, inserted independently at line 17, correctly complete the Sales class?()Adouble getSalesAmount() { return 1230.45; }Bpublic double getSalesAmount() { return 1230.45; }Cprivate double getSalesAmount() { return 1230.45; }Dprotected double getSalesAmount() { return 1230.45; }
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多选题14. DateFormat df; 15. Date date = new Date(); 16. //insert code here 17. String s = df.format( date); Which two,inserted independently at line 16, allow the code to compile?()Adf= new DateFormat();Bdf= Date.getFormatter();Cdf= date.getFormatter();Ddf= date.getDateFormatter();Edf = DateFormat.getDateInstance();Fdf= DateFormat.getInstance();
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