intermediate.AboutAutoboxing Maven / Gradle / Ivy

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package intermediate;

import com.sandwich.koan.Koan;

import java.util.ArrayList;
import java.util.List;

import static com.sandwich.koan.constant.KoanConstants.__;
import static com.sandwich.util.Assert.assertEquals;

public class AboutAutoboxing {

    @Koan
    public void addPrimitivesToCollection() {
        List list = new ArrayList();
        list.add(0, new Integer(42));
        assertEquals(list.get(0), __);
    }

    @Koan
    public void addPrimitivesToCollectionWithAutoBoxing() {
        List list = new ArrayList();
        list.add(0, 42);
        assertEquals(list.get(0), __);
    }

    @Koan
    public void migrateYourExistingCodeToAutoBoxingWithoutFear() {
        List list = new ArrayList();
        list.add(0, new Integer(42));
        assertEquals(list.get(0), __);

        list.add(1, 84);
        assertEquals(list.get(1), __);
    }

    @Koan
    public void allPrimitivesCanBeAutoboxed() {
        List doubleList = new ArrayList();
        doubleList.add(0, new Double(42));
        assertEquals(doubleList.get(0), __);

        List longList = new ArrayList();
        longList.add(0, new Long(42));
        assertEquals(longList.get(0), __);

        List characterList = new ArrayList();
        characterList.add(0, new Character('z'));
        assertEquals(characterList.get(0), __);
    }

}