1Z0-851 Exam Questions

Given a pre-generics implementation of a method: 11. public static int sum(List list) { 12. int sum = 0; 13. for ( Iterator iter = list.iterator(); iter.hasNext(); ) { 14. int i =...

A programmer has an algorithm that requires a java.util.List that provides an efficient implementation of add(0, object), but does NOT need to support quick random access. What sup...

Given: 11. //insert code here 12. private N min, max; 13. public N getMin() { return min; } 14. public N getMax() { return max; } 15. public void add(N added) { 16. if (min == null...

Given: import java.util.*; public class Explorer2 { public static void main(String[] args) { TreeSet<Integer> s = new TreeSet<Integer>(); TreeSet<Integer> subs = new TreeSet<Intege...

Given: public class Score implements Comparable<Score> { private int wins, losses; public Score(int w, int l) { wins = w; losses = l; } public int getWins() { return wins; } public...

Given: public class Person { private name; public Person(String name) { this.name = name; } public int hashCode() { return 420; } } Which statement is true?

Given: import java.util.*; public class SortOf { public static void main(String[] args) { ArrayList<Integer> a = new ArrayList<Integer>(); a.add(1); a.add(5); a.add(3); Collections...

Given 11. public interface Status { 12. /* insert code here */ int MY_VALUE = 10; 13. } Which three are valid on line 12? (Choose three.)

Given: class Atom { Atom() { System.out.print("atom "); } } class Rock extends Atom { Rock(String type) { System.out.print(type); } } public class Mountain extends Rock { Mountain(...

Click the Exhibit button. Which three statements are true? (Choose three.)

Given: 10. class Line { 11. public class Point { public int x,y;} 12. public Point getPoint() { return new Point(); } 13. } 14. class Triangle { 15. public Triangle() { 16. // inse...

Given: class Alpha { public void foo() { System.out.print("Afoo "); } } public class Beta extends Alpha { public void foo() { System.out.print("Bfoo "); } public static void main(S...

Click the Exhibit button. Which statement is true about the classes and interfaces in the exhibit?

Which two code fragments correctly create and initialize a static array of int elements? (Choose two.)

Given: 09. interface Foo { int bar(); } 10. 11. public class Sprite { 12. public int fubar( Foo foo ) { return foo.bar(); } 13. public void testFoo() { 14. fubar( 15. //insert code...

Given: class Alligator { public static void main(String[] args) { int []x[] = {{1,2}, {3,4,5}, {6,7,8,9}}; int [][]y = x; System.out.println(y[2][1]); } } What is the result?

Given: 22. StringBuilder sb1 = new StringBuilder("123"); 23. String s1 = "123"; 24. // insert code here 25. System.out.println(sb1 + " " + s1); Which code fragment, inserted at lin...

Given that the current directory is empty, and that the user has read and write permissions, and the following: import java.io.*; public class DOS { public static void main(String[...

Given: 11. class Converter { 12. public static void main(String[] args) { 13. Integer i = args[0]; 14. int j = 12; 15. System.out.println("It is " + (j == i) + " that j==i."); 16....

Given: 11. String test = "Test A. Test B. Test C."; 12. // insert code here 13. String[] result = test.split(regex); Which regular expression, inserted at line 12, correctly splits...

Given: import java.util.Date; import java.text.DateFormat; 21. DateFormat df; 22. Date date = new Date(); 23. //insert code here 24. String s = df.format(date); Which code fragment...

Given a class Repetition: package utils; public class Repetition { public static String twice(String s) { return s + s; } } and given another class Demo: 01. public class Demo { 02...

A UNIX user named Bob wants to replace his chess program with a new one, but he is not sure where the old one is installed. Bob is currently able to run a Java chess program starti...

Given: 01. interface Animal { void makeNoise(); } 02. class Horse implements Animal { 03. Long weight = 1200L; 04. public void makeNoise() { System.out.println("whinny"); } 05. } 0...

Given classes defined in two different files: package util; public class BitUtils { private static void process(byte[] b) {} } 01. package app; 02. public class SomeApp { 03. publi...

Click the Exhibit button. Given the fully-qualified class names: com.foo.bar.Dog com.foo.bar.blatz.Book com.bar.Car com.bar.blatz.Sun Which graph represents the correct directory s...

Given: public class ItemTest { private final int id; public ItemTest(int id) { this.id = id; } public void updateId(int newId) { id = newId; } public static void main(String[] args...

Given: public class Pass { public static void main(String [] args) { int x = 5; Pass p = new Pass(); p.doStuff(x); System.out.print(" main x = " + x); } void doStuff(int x) { Syste...

Given: 1. public class GC { 2. private Object o; 3. private void doSomethingElse(Object obj) { o = obj; } 4. public void doSomething() { 5. Object o = new Object(); 6. doSomethingE...

Given: public static void test(String str) { int check = 4; if (check = str.length()) { System.out.print(str.charAt(check -= 1) +", "); } else { System.out.print(str.charAt(0) + ",...

Given: 01. interface A { public void aMethod(); } 02. interface B { public void bMethod(); } 03. interface C extends A,B { public void cMethod(); } 04. class D implements B { 05. p...

Given that: Gadget has-a Sprocket and Gadget has-a Spring and Gadget is-a Widget and Widget has-a Sprocket Which two code fragments represent these relationships? (Choose two.)

A company that makes Computer Assisted Design (CAD) software has, within its application, some utility classes that are used to perform 3D rendering tasks. The company's chief scie...

Which Man class properly represents the relationship "Man has a best friend who is a Dog"?

Given: class Foo { public int a = 3; public void addFive() { a += 5; System.out.print("f "); } } class Bar extends Foo { public int a = 8; public void addFive() { this.a += 5; Syst...

Given: class Animal { public String noise() { return "peep"; } } class Dog extends Animal { public String noise() { return "bark"; } } class Cat extends Animal { public String nois...

Given: 01. class Super { 02. private int a; 03. protected Super(int a) { this.a = a; } 04. } 11. class Sub extends Super { 12. public Sub(int a) { super(a); } 13. public Sub() { th...

Given: public class Base { public static final String FOO = "foo"; public static void main(String[] args) { Base b = new Base(); Sub s = new Sub(); System.out.print(Base.FOO); Syst...

Given: package geometry; public class Hypotenuse { public InnerTriangle it = new InnerTriangle(); class InnerTriangle { public int base; public int height; } } Which statement is t...

Given: 01. public class Hi { 02. void m1() { } 03. protected void() m2 { } 04. } 05. 06. class Lois extends Hi { 07. // insert code here 08. } Which four code fragments, inserted i...

Which two code fragments are most likely to cause a StackOverflowError? (Choose two.)

Given: import java.io.IOException; class A { public void process() { System.out.print("A,"); } } 13. class B extends A { 14. public void process() throws IOException { 15. super.pr...

Given: 11. public void go(int x) { 12. assert (x > 0); 13. switch(x) { 14. case 2: ; 15. default: assert false; 16. } 17. } 18. private void go2(int x) { assert (x < 0); } Which st...

Given: 1. public class Breaker2 { 2. static String o = ""; 3. 4. public static void main(String[] args) { 5. z: for (int x = 2; x < 7; x++) { 6. if (x == 3) 7. continue; 8. if (x =...

Given: public static void main(String[] args) { String str = "null"; if (str == null) { System.out.println("null"); } else (str.length() == 0) { System.out.println("zero"); } else...

Given: public class Test { public static void main(String [] args) { int x = 5; boolean b1 = true; boolean b2 = false; if ((x == 4) && !b2 ) System.out.print("1 "); System.out.prin...

Given: static void test() throws Error { if (true) throw new AssertionError(); System.out.print("test "); } public static void main(String[] args) { try { test(); } catch (Exceptio...

Given: public class Foo { static int[] a; static { a[0]=2; } public static void main( String[] args ) {} } Which exception or error will be thrown when a programmer attempts to run...

Click the Exhibit button. Given: 25. try { 26. A a = new A(); 27. a.method1(); 28. } catch (Exception e) { 29. System.out.print("an error occurred"); 30. } Which two statements are...

Given: public static void main(String[] args) { for (int i = 0; i <= 10; i++) { if (i > 6) break; } System.out.println(i); } What is the result?