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Objektorienteeritud programmeerimine (LTAT.03.003)

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Eeldades, et kõik vajalikud import-id on olemas, milliste valikute puhul järgnev kood kompileerub, kui need (ühe kaupa) lisada //rida1 asemele?

class A {}

class B extends A {}

class C extends B {}

public class Test {

public List<? extends B> test(){

//rida1

}

}
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Sea vastavusse andmestruktuur ja elemendi eemaldamise meetod.

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Millise meetodiga saab kujutusest eemaldada kõik võti-väärtus paarid?

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Milliseid liideseid realiseerib klass LinkedList?

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Sea vastavusse liidese Collection meetod ja operatsiooni tulemus.

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Mis ilmub ekraanile?

import java.util.LinkedHashMap;

import java.util.Map;

public class TestLinkedHashMap {

public static void main(String[] args) {

Map<String, Integer> kujutus = new LinkedHashMap<>();

kujutus.put("B", 2);

kujutus.put("A", 1);

kujutus.put("C", 3);

System.out.println(kujutus.values());

}

}
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Mis ilmub ekraanile?

import java.util.*;

public class MinuComparator implements Comparator<String> {

public int compare(String a, String b) {

return b.compareTo(a);

}

}

import java.util.Set;

import java.util.TreeSet;

public class CompDemo {

public static void main(String args[]) {

Set<String> ts = new TreeSet<>(new MinuComparator());

ts.add("C");

ts.add("A");

ts.add("E");

ts.add("D");

for (String o : ts)

System.out.print(o + " ");

}

}
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Milline väide on tõene?

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Kuidas eemaldada korduvad elemendid listist meielist?

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Mis on erinevus TreeSet ja SortedSet vahel?

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