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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...
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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1. public class test ( 2. public static void main(string args[]) { 3. int 1= 0; 4. while (i) { 5. if (i==4) { 6. break; 7. } 8. ++i; 9. } 10. 11. } 12. ) What is the value of i at line 10?()A 0B 3C 4D 5E The code will not compile....
问题:5. String foo = “base”; 6. foo.substring(0,3); 7. foo.co...
问题:10. interface A { void x(); } 11. class B implements A { pu...
问题:单选题Consider the following class: class Test(int i) { void test(int i) { System.out.println(“I am an int.”); } void test(String s) { System.out.println(“I am a string.”); } public static void main(String args) { Test t=new Tes...
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:多选题class ClassA {} class ClassB extends ClassA {} class ClassC extends ClassA {} and: ClassA p0 = new ClassA(); ClassB p1 = new ClassB(); ClassC p2 = new ClassC(); ClassA p3 = new ClassB(); ClassA p4 = new ClassC(); Which three are valid?()Ap0 = ...
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 three statements concerning the use of the java.io.Ser...
问题:Which two valid declarations of a char? ()...
问题:单选题1. public class Exception Test { 2. class TestException extends Exception {} 3. public void runTest() throws TestException {} 4. public void test() /* Point X */ { 5. runTest(); 6. } 7. } At Point X on line 4, which code is necessary to make the...
问题:单选题public class SyncTest { private int x; private int y; public synchronized void setX (int i) (x=1;) public synchronized void setY (int i) (y=1;) public synchronized void setXY(int 1)(set X(i); setY(i);) public synchronized Boolean check() (re...
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:单选题Which line contains a constructor in this class definition?() public class Counter { // (1) int current, step; public Counter(int startValue, int stepValue) { // (2) set(startValue); setStepValue(stepValue); } public int get() { return cur...
问题:单选题System.out.format(”Pi is approximately %d.”, Math.PI); What is the result?()A Compilation fails.B Pi is approximately 3.C Pi is approximately 3.141593.D 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...
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;...