当前分类: SCJP程序员认证考试
问题:10. interface A { void x(); } 11. class B implements A { pu...
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问题:单选题public class Alpha{ private static Character() ids; public static void main( String[] args){ ids = new Character[args.length]; for (int i=0; iids[i] = new Character( args[i] ); System.out.print( ids[i] ); } } } What is correct?()A Compilatio...
问题:多选题public class SyncTest{ public static void main(String args) { final StringBuffer s1= new StringBuffer(); final StringBuffer s2= new StringBuffer(); new Thread () { public void run() { synchronized(s1) { s2.append(“A”); synchronized(...
问题:单选题Assuming that the serializeBanana2() and the deserializeBanana2() methods will correctly use Java serialization and given: import java.io.*; class Food {Food() { System.out.print(”1”); } } class Fruit extends Food implements Serializable { Fruit() ...
问题:单选题public class Threads5 { public static void main (String[] args) { new Thread(new Runnable() { public void run() { System.out.print(”bar”); } }).start(); } } What is the result?()A Compilation fails.B An exception is thrown at runtime.C The c...
问题:多选题Which two CANNOT directly cause a thread to stop executing?()ACalling the yield method.BCalling the wait method on an object.CCalling the notify method on an object.DCalling the notifyAll method on an object.ECalling the start method on another Thread ...
问题:单选题11. public void someMethod(Object value) { 12. // check for null value .... 20. System.out.println(value.getClass()); 21. } What, inserted at line 12, is the appropriate way to handle a null value?()A assert value == null;B assert value !null, “v...
问题:1. interface TestA { String toString(); } 2. public class T...
问题:单选题11. abstract class Vehicle { public int speed() { return 0; } } 12. class Car extends Vehicle { public int speed() { return 60; } } 13. class RaceCar extends Car { public int speed() { return 150; }} ...... 21. RaceCar racer = new RaceCar(); 22. C...
问题:单选题public class Foo { public static void main(String[] args) { try { return; } finally { System.out.println( “Finally” ); } } } What is the result?()A FinallyB Compilation fails.C The code runs with no output.D An exception is thrown at runti...
问题:5. String foo = “base”; 6. foo.substring(0,3); 7. foo.co...
问题:单选题1. public class Boxer1 { 2. Integer i; 3. int x; 4. public Boxer1(int y) { 5. x=i+y; 6. System.out.println(x); 7. } 8. public static void main(String[] args) { 9. new Boxer1(new Integer(4)); 10. } 11. } What is the result?()A The value “4” ...
问题:单选题String foo = “blue”; Booleanbar = new Boolean [1]; if (bar[0]) { foo = “green”; } What is the result?()A Foo has the value of “”B Foo has the value of null.C Foo has the value of “blue”D Foo has the value of “green”E An exception is ...
问题:单选题static void test() throws Error { if (true) throw new AssertionError(); System.out.print(”test “); } public static void main(String[] args) { try { test(); } catch (Exception ex) { System.out.print(”exception “); } System.out.print(”elld “); } ...
问题:多选题Given that c is a reference to a valid java.io.Console object, which two code fragments read a line of text from the console?()AString s = c.readLine();Bchar[ ] c = c.readLine();CString s = c.readConsole();Dchar[ ] c = c.readConsole();EString s = c.rea...
问题:多选题Which two valid declarations of a char?()AChar ch = “a”;BChar ch = ‘/’ ‘;CChar ch = ‘cafe’;DChar ch = “cafe”;EChar ch = ‘/ucafe’;FChar ch = ‘/u10100’;GChar ch = (char) true;...
问题:多选题AnInterface is an interface. AnAdapter0 is a non-abstract, non-final class with a zero argument constructor. AnAdapter1 is a non-abstract, non-final class without a zero argument constructor, but with a constructor that takes one int argument. W...
问题:单选题public class Test { private static int[] x; public static void main(String[] args) { System.out.println(x[0]); } } What is the result?()A 0B nullC Compilation fails.D A NullPointerException is thrown at runtime.E An ArrayIndexOutOfBoundsExc...
问题:Which two valid declarations of a char? ()...
问题:单选题Which of the following range of short is correct?()A -27 -- 27-1B 0 -- 216-1C -215 -- 215-1D -231 -- 231-1...