当前分类: SCJP程序员认证考试
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...
查看答案
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: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public class test ( public static void main(string args) { int 1= 0; while (i) { if (i==4) { break; } ++i; } } ) What is the value of i at line 10?()A 0B 3C 4D 5E The code will not compile....
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Given classes defined in two different files: 1. package util; 2. public class BitUtils { 3. private static void process(byte[] b) { } 4. } 1. package app; 2. public class SomeApp { 3. public static void main(String[] args) { 4. byte[] bytes = ...
问题:10. interface A { void x(); } 11. class B implements A { pu...
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:5. String foo = “base”; 6. foo.substring(0,3); 7. foo.co...
问题:Which interface does java.util.Hashtable implement?() ...
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...
问题:单选题Given the command line java Pass2 and: public class Pass2 { public void main(String [] args) { int x=6; Pass2 p = new Pass2(); p.doStuff(x); System.out.print(” main x = “+ x); } void doStuff(int x) { System.out.print(” doStuffx = “+ x++); } }...
问题: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(){} }...
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2. public class Foo implements Runnable ( 3. public void run (Thread t) { 4. system.out.printIn(“Running.”); 5. } 6. public static void main (String[] args) { 7. new thread (new Foo()).start(); 8. ) 9. ) What is the result?()A An exception is...
问题:单选题public class Test { public static void main (Stringargs) { String foo = args[1]; String bar = args; String baz = args; System.out.printIn(“baz = ” + baz); } } And the output: Baz = 2 Which command line invocation will produce the outp...
问题:public interface Foo { int k = 4; 3. } Which three are equ...
问题:Which code fragments will succeed in initializing a two-dime...
问题:单选题What will be the result of attempting to compile and run the following program?() public class Q28fd { public static void main(String args[]) { int counter = 0; l1: for (int i=10; i i) break l2; if (i == j) { counter++; continue l1; }...