Übung Java Equals and Hashcode
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Thu, 28 Mar 2024 11:23:32 +0000
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Simtech AG - Ausbildung - Java - Kurs Java Advanced - Kurs Java Advanced - Ressourcen - Kurs Java Advanced - Übungen Collections - Übung Java Equals and Hashcode
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Übung Java Equals and Hashcode
https://www.cmseo.ch/kurse-java-hashcode
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Thu, 28 Mar 2024 11:23:32 +0000
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Mit dieser Übung sollen die Methoden equals(...) und hashCode() implementiert werden. Das folgende Listing zeigt die Klasse "Userid":package ch.std.jpf2.collections.equalshashcode;
public class Userid {
private String userid;
private String password;
public Userid() {
this("", "");
}
public Userid(String userid) {
this(userid, "");
}
public Userid(String userid, String password) {
super();
this.password = password;
this.userid = userid;
}
@Override
public String toString() {
return "userid:" + userid + ", password:" + password;
}
}Das folgende Listing zeigt die Unit Testklasse "UseridTestCase ":package ch.std.jpf2.collections.equalshashcode;
import java.util.HashSet;
import java.util.Set;
import org.junit.Assert;
import org.junit.jupiter.api.Test;
public class UseridTestCase {
@Test
public void testSameEquals() {
Userid user1 = new Userid("hans", "123");
Userid user2 = user1;
Assert.assertSame(user1, user2);
Assert.assertEquals(user1, user2);
}
@Test
public void testNotSame() {
Userid user1 = new Userid("hans", "123");
Userid user2 = new Userid("peter", "456");
Assert.assertNotSame(user1, user2);
}
@Test
public void testEquals() {
Userid user1 = new Userid("hans", "123");
Userid user2 = new Userid("hans", "123");
Assert.assertEquals(user1, user2);
}
@Test
public void testHashcode() {
Userid user1 = new Userid("hans", "123");
Userid user2 = new Userid("hans", "123");
Assert.assertEquals(user1.hashCode(), user2.hashCode());
}
@Test
public void testSet() {
Userid user1 = new Userid("hans", "123");
Userid user2 = new Userid("hans", "123");
Userid user3 = new Userid("peter", "456");
Userid user4 = new Userid("peter", "456");
Set useridSet = new HashSet();
useridSet.add(user1);
useridSet.add(user2);
useridSet.add(user3);
useridSet.add(user4);
Assert.assertEquals(2, useridSet.size());
}
}
https://www.cmseo.ch/kurse-java-hashcode
9c00cfeb-ecf5-11ee-8c11-005056bb85fb
Thu, 28 Mar 2024 11:23:32 +0000
Integrieren Sie die beiden Klassen in ihre Entwicklungsumgebung und führen Sie den JUnit Test aus. Die letzten 3 Tests werden nicht funktionieren:Implementieren Sie nun die fehlenden Methoden equals(...) und hashCode() in die Klasse Userid, so dass alle TestCases korrekt funktionieren.
https://www.cmseo.ch/kurse-java-hashcode
9c00d1a4-ecf5-11ee-8c11-005056bb85fb
Thu, 28 Mar 2024 11:23:32 +0000
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