Gemeinsames Lernen

src/org/eidecker/oca8lernen/general/ArrayFun.java

@@ -0,0 +1,35 @@
+package org.eidecker.oca8lernen.general;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.jupiter.api.Test;
+
+/**
+ * @author seidecke.
+ */
+public class ArrayFun {
+
+	char index;
+
+	@Test
+	public void testArrayInit() {
+		String[] strings = {"Hallo", "Welt"};
+		assertEquals(0, index);
+		assertEquals("Hallo", strings[index]);
+
+		assertEquals("Hallo", strings[(byte) 1]);
+		assertEquals("Hallo", strings[(short) 1]);
+		assertEquals("Hallo", strings[(char) 1]);
+
+		// assertEquals("Hallo", strings[(float) 1]); // Compilerfehler, muss Ganzzahl sein
+		// assertEquals("Hallo", strings[(long) 1]); // Compilerfehler, muss int oder kleiner sein
+
+		// Arrayklammern vor und nach Variablenname erlaubt
+		String [] twodim [];
+
+		String[][] twoDimStrings = {strings};
+
+
+	}
+
+}

src/org/eidecker/oca8lernen/general/ForEach.java

@@ -0,0 +1,24 @@
+package org.eidecker.oca8lernen.general;
+
+import java.util.List;
+import org.junit.jupiter.api.Test;
+
+/**
+ * @author seidecke.
+ */
+public class ForEach {
+
+	@Test
+	public void testLaufvariable() {
+
+		int[] ints = new int[5];
+
+		for (int i: ints)
+			System.out.println(i);
+
+
+		List<String> sList;
+
+
+	}
+}

src/org/eidecker/oca8lernen/general/Primitive.java

@@ -1,12 +1,12 @@
 package org.eidecker.oca8lernen.general;
 
-import org.junit.jupiter.api.Test;
-
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertFalse;
 import static org.junit.jupiter.api.Assertions.assertNotEquals;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
+import org.junit.jupiter.api.Test;
+
 public class Primitive {
 
 
@@ -85,6 +85,8 @@ public class Primitive {
 		char c5;
 		byte b9 = 2;
 
+		byte b2 = 'a';
+
 		float f9 = Long.MAX_VALUE;
 		System.out.println("f9: " + f9);
 
@@ -112,6 +114,10 @@ public class Primitive {
 		assertFalse(short3 == short4);
 
 
+		Short short5 = new Short((short)127);
+		Short short6 = new Short((short)127);
+		assertFalse(short5 == short6);
+
 	}
 
 	@Test
@@ -123,3 +129,9 @@ public class Primitive {
 
 
 }
+
+class AndereKlasse {
+	public static void main(String[] args) {
+		System.out.println("Geht auch aus nicht public-Klasse");
+	}
+}

src/org/eidecker/oca8lernen/general/PrimitiveUndWrapperTest.java

@@ -37,6 +37,13 @@ public class PrimitiveUndWrapperTest {
 //		System.out.println(s);
 	}
 
+	@Test
+	public void literalUnderscore() {
+		// int i = 1_1_;
+
+		double d = 1_1.1_1;
+	}
+
 	@Test
 	public void wrapperEquals() {
 

src/org/eidecker/oca8lernen/general/StringIndex.java

@@ -57,6 +57,12 @@ public class StringIndex {
 
 		testStringBuilder = new StringBuilder("1234567890");
 		assertEquals("12345890", testStringBuilder.delete(5,7).toString());
+
+
+		testStringBuilder = new StringBuilder("1234567890");
+		assertEquals("1234567890", testStringBuilder.delete(5,5).toString());
+
+
 		testStringBuilder = new StringBuilder("1234567890");
 		assertEquals("71234567890", testStringBuilder.insert(0,7).toString());
 		testStringBuilder = new StringBuilder("1234567890");

src/org/eidecker/oca8lernen/general/SwitchSyntax.java

@@ -28,6 +28,24 @@ public class SwitchSyntax {
 	}
 	// Todo SeEi
 
+	@Test
+	public void switchWithComputation() {
+
+		final int i = 3;
+
+		switch(getSwitchBEdingung()) {
+			case i:
+				System.out.println("i");
+				break;
+			case i-1:
+				System.out.println("i-1");
+			default:
+				System.out.println("Was anderes");
+		}
+
+
+	}
+
 	@Test
 	public void switchString() {
 		switch (getString()) {

src/org/eidecker/oca8lernen/lastminute/Kleinigkeiten.java

@@ -1,19 +1,28 @@
 package org.eidecker.oca8lernen.lastminute;
 
-import org.eidecker.oca8lernen.lastminute.hilfspackage.KlasseInEinemAnderenPackage;
-import org.junit.jupiter.api.Test;
-
 import java.io.Serializable;
+import java.time.LocalDate;
+import java.time.LocalTime;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 import java.util.concurrent.ThreadFactory;
+import org.eidecker.oca8lernen.lastminute.hilfspackage.KlasseInEinemAnderenPackage;
+import org.junit.jupiter.api.Test;
 
 public class Kleinigkeiten {
 
 	// Methoden dürfen private final sein (final sinnlos)
 	private final String methode() {
+		LocalTime t1 = LocalTime.now();
+		LocalDate t2 = LocalDate.now();
+
+		t1 instanceof t2;
+
+
 		return "Sinnlos";
+
+
 	}
 
 	@Test
@@ -21,7 +30,20 @@ public class Kleinigkeiten {
 		if (false)
 			if (false) System.out.println("0");
 				else System.out.println("1");
-				// else System.out.println("2");
+//				 else System.out.println("2");
+	}
+
+	public void variabennamen (int i) {
+		// for (int i = i; )
+	}
+
+	@Test
+	public void removeFromArrayList() {
+		List<Integer> iList = new ArrayList<>();
+		iList.add(1);
+		iList.add(1);
+		iList.add(2);
+		iList.remove(new Integer(1));
 	}
 
 	@Test

src/org/eidecker/oca8lernen/lastminute/StaticSichtbarkeit.java

@@ -9,13 +9,24 @@ public class StaticSichtbarkeit {
 		Ober ober = new Unter();
 		ober.methode2(ober); // Ober, da zur Compilezeit ausgewählt (Bei Überladen würde nur die Signatur gewählt!)
 
-		Unter.methode2(ober);
 	}
 
 }
 
+interface Interface {
+	static void methode2(Ober ober) {
+		System.out.println("Interface");
+	}
 
-class Ober {
+	static void methode3(Ober ober) {
+		System.out.println("Interface");
+	}
+}
+
+
+class Ober implements Interface {
+
+	public static String s = "OberStatic";
 
 	private final void geheimeMethode() {
 
@@ -25,11 +36,17 @@ class Ober {
 		System.out.println("Ober");
 	}
 
+	void methode3(Ober ober) {
+
+	}
+
 
 }
 
 class Unter extends Ober {
 
+	public String s = "UnterNichtStatic";
+
 	public void geheimeMethode() {
 
 	}