网友您好, 请在下方输入框内输入要搜索的题目:

题目内容 (请给出正确答案)
多选题
In which two cases does the compiler supply a default constructor for class A?()
A

class A{}

B

class A { public A(){} }

C

class A { public A(int x){} }

D

class Z {} class A extends Z { void A(){} }


参考答案

参考解析
解析: 暂无解析
更多 “多选题In which two cases does the compiler supply a default constructor for class A?()Aclass A{}Bclass A { public A(){} }Cclass A { public A(int x){} }Dclass Z {} class A extends Z { void A(){} }” 相关考题
考题 单选题1. public class Test {  2. int x= 12;  3. public void method(int x) {  4. x+=x;  5. System.out.println(x);  6. }  7. }  Given:  34. Test t = new Test();  35. t.method(5);  What is the output from line 5 of the Test class?()A  5B  10C  12D  17E  24

考题 单选题class Super {  public int i = 0;  public Super(String text) {  i = 1; }  }  public class Sub extends Super {  public Sub(String text) {  i = 2;  }   public static void main(String args[]) {  Sub sub = new Sub(“Hello”);  System.out.println(sub.i);  }  }  What is the result?()A  0B  1C  2D  Compilation fails.

考题 单选题A programmer needs to create a logging method that can accept an arbitrary number of arguments. For example, it may be called in these ways:  logIt(”log message 1 “);  logIt(”log message2”,”log message3”);  logIt(”log message4”, “log message5”, “log message6);  Which declaration satisfies this requirement?()A  public void logIt(String * msgs)B  public void logIt(String [] msgs)C  public void logIt(String... msgs)D  public void logIt(String msg1, String msg2, String msg3)

考题 多选题Which two statements are true regarding the creation of a default constructor? ()AThe default constructor initializes method variables.BThe compiler always creates a default constructor for every class.CThe default constructor invokes the no-parameter constructor of the superclass.DThe default constructor initializes the instance variables declared in the class.EWhen a class has only constructors with parameters, the compiler does not create a default  constructor.

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. 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?()ALine 15 causes a stack overflow.BAn exception is thrown at runtime.CThe object referenced by a is eligible for garbage collection.DThe object referenced by b is eligible for garbage collection.EThe object referenced by a is not eligible for garbage collection.FThe object referenced by b is not eligible for garbage collection.

考题 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; }

考题 单选题You need to store elements in a collection that guarantees that no duplicates are stored and all elements can be accessed in natural order. Which interface provides that capability?()A Java.util.Map.B Java.util.Set.C Java.util.List.D Java.util.StoredSet.E Java.util.StoredMap.F Java.util.Collection.