问题:针对Set s接口,下列哪项是正确的?() A、 s.add(2)B、 s.add(new Integer(2))C、 s.add(“2”)D、 s.add(new java.util.Date())...
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问题:Which of the f...
问题:下列哪项不是有效的标识符?() ...
问题:public class Test&ens...
问题:现有: 1. class Book { 2. private final void read() { System.out.print("book "); } 3. } 4. class Page extends Book { 5. public static void main(String [] args) { 6. // insert code here 7. } 8. private final void read() { Syst...
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问题:Which fragment is an example of inappropriate use of assertions? ()A、 assert (!(map.contains(x))); map.add(x);B、 if (x 0){}else { assert (x==0); }C、 public void aMethod(int x) { assert (x 0); }D、 assert (invariantCondition()); return retval;E、 switch (x...
问题:Which three are valid values for the body-content attribute of a tag directive in a tag file?()A、ELB、JSPC、EmptyD、DynamicE、ScriptlessF、Tagdependent...
问题:Which statements concerning the event model of the AWT are true?() A、At most one listener of each type can be registered with a component.B、Mouse motion listeners can be registered on a List instance.C、There exists a class named ContainerEvent in package...
问题:下列哪项是String的字面量?() A、“Hello”B、‘world’C、/u2345D、new String(“good”)...
问题:现有: public class Tester { public static void main (String[] args) { intx-5; Integer xl=x; Integer x2=x; int x3=new Integer(5); system..ut.print(x1.equals(x)); system..ut.print(xl==x); system..ut.print(x2.equals(xl)); system..ut.p...
问题:HTTP中的POST和GET在下列哪些方面有区别()。...
问题:switch(x) { default: System.out.println(“Hello”); } Which two are acceptable types for x?() A、 byteB、 longC、 charD、 floatE、 ShortF、 Long...
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问题:Java中方法绑定有哪些形式?()A、编译时刻绑定B、运行时刻绑定C、静态绑定D、私有绑定...
问题:以下有关接口的叙述错误的是哪项?() ...
问题:父类对象与子类对象相互转化的条件是什么?如何实现它们的相互转化?...