当前分类： SCJP程序员认证考试
问题：boolean bool = true； if（bool = false） { System.out.println（“...
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问题：单选题public class X { public static void main （Stringargs） { string s = new string （“Hello”）； modify（s）； System.out.printIn（s）； } public static void modify （String s） { s += “world!”； } } What is the result？（）A The program runs and print...
问题：The 8859-1 character code for the uppercase letter A is 65. ...
问题：多选题1. class BaseClass { 2. private float x = 1.of； 3. protected float getVar（） { return x； } 4. } 5. class SubClass extends BaseClass { 6. private float x = 2.Of； 7. // insert code here 8. } Which two are valid examples of method overriding when i...
问题：1） class Person { 2） public void printValue（int i， int j） {...
问题：单选题1. public class Test { 2. public static void main （String []args） { 3. unsigned byte b = 0； 4. b--； 5. 6. } 7. } What is the value of b at line 5？（）A -1B 255C 127D Compilation will fail.E Compilation will succeed but the program will...
问题：多选题package com.company.application； public class MainClass { public static void main（String[] args） { } } And MainClass exists in the /apps/com/company/application directory. Assume the CLASSPATH environment variable is set to “.“ （current directory）....
问题：多选题public class X { public X aMethod（） { return this；} } public class Y extends X { } Which two methods can be added to the definition of class Y？（）Apublic void aMethod（） {}Bprivate void aMethod（） {}Cpublic void aMethod（String s） {}Dprivate Y aMethod...
问题：多选题class A { } class Alpha { private A myA = new A（）； void dolt（ A a ） { a = null； } void tryIt（） { dolt（ myA ）； } } Which two statements are correct？（）AThere are no instanced of A that will become eligible for garbage collection.BExplicitly se...
问题：Which of the following statements are legal？（） ...
问题：Which method is an appropriate way to determine the cosine o...
问题：System.out.println（Math.sqrt（-4D））； What is the result？（） ...
问题：多选题public class Key { private long id1； private long 1d2； // class Key methods } A programmer is developing a class Key， that will be used as a key in a standard java.util.HashMap. Which two methods should be overridden to assure that Key works corre...
问题：Which statement is true for the class java.util.ArrayList？（）...
问题：单选题How can you create a listener class that receives events when the mouse is moved？（）A By extending MouseListener.B By implementing MouseListener.C By extending MouseMotionListener.D By implementing MouseMotionListener.E Either by extending MouseMot...
问题：单选题public class Foo { public void main（ String[] args ） { System.out.println（ “Hello” + args[0] ）； } } What is the result if this code is executed with the command line？（）A HelloB Hello FooC Hello worldD Compilation fails.E The code does not ru...
问题：11. public enum Title { 12. MR（”Mr.”）， MRS（”Mrs.”）， MS（”Ms....
问题：多选题Which two statements are reserved words in Java？（）ARunBImportCDefaultDImplement...
问题：单选题String a = null； a.concat（“abc”）； a.concat（“def”）； System.out.println（a）； What is the result？（）A abcB nullC abcdefD Compilation fails.E The code runs with no output.F An exception is thrown at runtime....
问题：单选题What will be written to the standard output when the following program is run？（） public class Q63e3 { public static void main（String args[]） { System.out.println（9 ^ 2）； } }A 81B 7C 11D 0E false...
