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Which interfaces extend a Collection interface?
List
Map
Set
Queue
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Java Collections
Which data structure that implements a Map interface uses an == operator, rather than the equals method for objects comparison?
What will happen after the following code compilation and execution: class TreeTest { private static Set<String> set = new TreeSet<String>(); public static void main(String[] args) { set.add("one"); set.add("two"); set.add("three"); set.add("/u000a"); set.add("/u000d"); set.add("/u000c"); set.add("1"); set.add("2"); set.add("3"); for (String string : set) { System.out.print(string + " "); } } }
What will be printed after the following code execution? import java.util.*; public class MapTest { public static void main( String[] args ) { Map<String, Integer> map1 = new HashMap<String, Integer>(); Map<String, Integer> map2 = new HashMap<String, Integer>(); map1.put( "Number1", new Integer( 100 ) ); map1.put( "Number2", new Integer( 200 ) ); map1.put( "Number3", new Integer( 300 ) ); List<Map> list = new ArrayList<Map>(); list.add( map1 ); list.add( map2 ); HashMap resultMap = (HashMap) list.get( 0 ); System.out.println( "Number: " + resultMap.get( "Number2" ) ); } }
What interfaces provide the ability to store objects as a "key-value" pairs?
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What will be printed out as a result of the following code execution / compilation? class A { public A() { System.out.print("A"); } } class B { public B() { System.out.print("B"); } } class C { public C() { System.out.print("C"); } } public class D extends C { private A objA = new A(); private static B objB = new B(); public D() { System.out.print("D"); } public static void main(String[] args){ new D(); } }
What will be printed out as a result of the following code execution / compilation? public class Test { private String name; Test(String name) { this.name = name; } public void test(final Test test) { test = new Test("three"); } public String toString() { return name; } public static void main(String[] args) { Test t1 = new Test("one"); Test t2 = new Test("two"); t1.test(t2); System.out.println(t2); } }
What will be printed out as a result of the following code execution / compilation? public class Test { static void m(int ... a) { System.out.println("1"); } static void m(Integer ... a) { System.out.println("2"); } public static void main(String[] args) { m(1, 2); } }
What will be printed out as a result of the following code execution / compilation? public class Test { public static void main(String[] args) { ElectricInverter inverter = new ElectricInverter(); int AC = 220; System.out.println(inverter.invert(AC)); } } class ElectricInverter { public static final int AC = ~220; public static final int DC = -110; public static final int GROUND = 0; int invert(int type) { if (type == AC) { return DC; } else if (type == DC) { return AC; } return GROUND; } }
int i = Integer.MAX_VALUE + 10; What is the result of the given line execution?
What happens after the following code is compiled and run: 01: interface TheInterface { 02: void print(); 03: } 04: 05: class TheClass implements TheInterface { 06: public void print() { 07: System.out.println("TheClass"); 08: } 09: } 10: 11: public class ClassConversion { 12: public static void main(String[] args) { 13: TheClass c = new TheClass(); 14: TheInterface i = c; 15: i.print(); 16: } 17: }
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