From ba8948806f2596330bcd5e6fff86988cff94d645 Mon Sep 17 00:00:00 2001
From: 1925458 <1925458tud.hs-mannheim.de>
Date: Tue, 16 Apr 2024 15:24:31 +0200
Subject: [PATCH] Created the first Exercises for Variables and Primitives

---
 .classpath                                 |  10 +++++++
 .project                                   |  17 +++++++++++
 .settings/org.eclipse.core.resources.prefs |   2 ++
 .settings/org.eclipse.jdt.core.prefs       |  14 ++++++++++
 README.md                                  |  17 +++++++++++
 bin/datatypes/Primitives1.class            | Bin 0 -> 749 bytes
 bin/datatypes/Primitives2.class            | Bin 0 -> 749 bytes
 bin/datatypes/Primitives3.class            | Bin 0 -> 749 bytes
 bin/datatypes/Primitives4.class            | Bin 0 -> 749 bytes
 bin/datatypes/Primitives5.class            | Bin 0 -> 749 bytes
 bin/datatypes/Primitives6.class            | Bin 0 -> 749 bytes
 bin/datatypes/Primitives8.class            | Bin 0 -> 1279 bytes
 bin/datatypes/Strings1.class               | Bin 0 -> 800 bytes
 bin/module-info.class                      | Bin 0 -> 148 bytes
 bin/variables/Variables1.class             | Bin 0 -> 582 bytes
 bin/variables/Variables2.class             | Bin 0 -> 597 bytes
 bin/variables/Variables3.class             | Bin 0 -> 585 bytes
 src/datatypes/Primitives1.java             |  25 +++++++++++++++++
 src/datatypes/Primitives2.java             |  24 ++++++++++++++++
 src/datatypes/Primitives3.java             |  28 +++++++++++++++++++
 src/datatypes/Primitives4.java             |  30 ++++++++++++++++++++
 src/datatypes/Primitives5.java             |  31 +++++++++++++++++++++
 src/datatypes/Primitives6.java             |  31 +++++++++++++++++++++
 src/datatypes/Primitives7.java             |  28 +++++++++++++++++++
 src/datatypes/Primitives8.java             |  28 +++++++++++++++++++
 src/datatypes/Strings1.java                |  24 ++++++++++++++++
 src/module-info.java                       |   8 ++++++
 src/variables/Variables1.java              |  18 ++++++++++++
 src/variables/Variables2.java              |  19 +++++++++++++
 src/variables/Variables3.java              |  20 +++++++++++++
 30 files changed, 374 insertions(+)
 create mode 100644 .classpath
 create mode 100644 .project
 create mode 100644 .settings/org.eclipse.core.resources.prefs
 create mode 100644 .settings/org.eclipse.jdt.core.prefs
 create mode 100644 README.md
 create mode 100644 bin/datatypes/Primitives1.class
 create mode 100644 bin/datatypes/Primitives2.class
 create mode 100644 bin/datatypes/Primitives3.class
 create mode 100644 bin/datatypes/Primitives4.class
 create mode 100644 bin/datatypes/Primitives5.class
 create mode 100644 bin/datatypes/Primitives6.class
 create mode 100644 bin/datatypes/Primitives8.class
 create mode 100644 bin/datatypes/Strings1.class
 create mode 100644 bin/module-info.class
 create mode 100644 bin/variables/Variables1.class
 create mode 100644 bin/variables/Variables2.class
 create mode 100644 bin/variables/Variables3.class
 create mode 100644 src/datatypes/Primitives1.java
 create mode 100644 src/datatypes/Primitives2.java
 create mode 100644 src/datatypes/Primitives3.java
 create mode 100644 src/datatypes/Primitives4.java
 create mode 100644 src/datatypes/Primitives5.java
 create mode 100644 src/datatypes/Primitives6.java
 create mode 100644 src/datatypes/Primitives7.java
 create mode 100644 src/datatypes/Primitives8.java
 create mode 100644 src/datatypes/Strings1.java
 create mode 100644 src/module-info.java
 create mode 100644 src/variables/Variables1.java
 create mode 100644 src/variables/Variables2.java
 create mode 100644 src/variables/Variables3.java

diff --git a/.classpath b/.classpath
new file mode 100644
index 0000000..57bca72
--- /dev/null
+++ b/.classpath
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-17">
+		<attributes>
+			<attribute name="module" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="src" path="src"/>
+	<classpathentry kind="output" path="bin"/>
+</classpath>
diff --git a/.project b/.project
new file mode 100644
index 0000000..9c23653
--- /dev/null
+++ b/.project
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>javalings</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+</projectDescription>
diff --git a/.settings/org.eclipse.core.resources.prefs b/.settings/org.eclipse.core.resources.prefs
new file mode 100644
index 0000000..99f26c0
--- /dev/null
+++ b/.settings/org.eclipse.core.resources.prefs
@@ -0,0 +1,2 @@
+eclipse.preferences.version=1
+encoding/<project>=UTF-8
diff --git a/.settings/org.eclipse.jdt.core.prefs b/.settings/org.eclipse.jdt.core.prefs
new file mode 100644
index 0000000..8c9943d
--- /dev/null
+++ b/.settings/org.eclipse.jdt.core.prefs
@@ -0,0 +1,14 @@
+eclipse.preferences.version=1
+org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=17
+org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
+org.eclipse.jdt.core.compiler.compliance=17
+org.eclipse.jdt.core.compiler.debug.lineNumber=generate
+org.eclipse.jdt.core.compiler.debug.localVariable=generate
+org.eclipse.jdt.core.compiler.debug.sourceFile=generate
+org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
+org.eclipse.jdt.core.compiler.problem.enablePreviewFeatures=disabled
+org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
+org.eclipse.jdt.core.compiler.problem.reportPreviewFeatures=warning
+org.eclipse.jdt.core.compiler.release=enabled
+org.eclipse.jdt.core.compiler.source=17
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..8e652dd
--- /dev/null
+++ b/README.md
@@ -0,0 +1,17 @@
+# javalings
+
+## About
+
+The javalings repository is attempting to recreate the rustlings programm,
+which is an introduction into the rust language. Respectivly, javalings
+attempts to recreate that form of introduction for the java language. This
+ressource is primarilly meant to be an additional ressource for students of the
+university of applied science mannheim, however anyone interested in
+understanding the java language can and should be able to follow this, as the
+course should be as newbie friendly as possible.
+
+## Work in Progress
+
+javalings is a Work in Progress, as time alloted to this project is minimal and
+does not enjoy priority in my project list at this moment. PRs may therefore
+also take a while to review
diff --git a/bin/datatypes/Primitives1.class b/bin/datatypes/Primitives1.class
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diff --git a/src/datatypes/Primitives1.java b/src/datatypes/Primitives1.java
new file mode 100644
index 0000000..b13df03
--- /dev/null
+++ b/src/datatypes/Primitives1.java
@@ -0,0 +1,25 @@
+package datatypes;
+
+public class Primitives1 {
+
+	  public static void main(String[] args) {
+	    /* Modify below */
+
+	    // Create a 'byte' variable named 'x' with the value '24'
+
+	    // Create a 'byte' variable named 'y' with the value '18'
+
+	    // Fix this
+	    byte sum = x + y;
+	    byte rest = x - y;
+	    byte div = x / y;
+	    byte prod = x * y;
+
+	    /* Modify above */
+	    System.out.println("x + y = " + sum);
+	    System.out.println("x - y = " + rest);
+	    System.out.println("x / y = " + div + ", did you expect this?");
+	    System.out.println("x * y = " + prod + ", did you expect this?");
+	  }
+
+	}
diff --git a/src/datatypes/Primitives2.java b/src/datatypes/Primitives2.java
new file mode 100644
index 0000000..fe19098
--- /dev/null
+++ b/src/datatypes/Primitives2.java
@@ -0,0 +1,24 @@
+package datatypes;
+
+public class Primitives2 {
+
+	  public static void main(String[] args) {
+	    /* Modify below */
+
+	    // Create a 'short' variable named 'x' with the value '12_500'
+
+	    // Create a 'short' variable named 'y' with the value '4_000'
+
+	    // Fix this
+	    short sum = x + y;
+	    short rest = x - y;
+	    short div = x / y;
+	    short prod = x * y;
+
+	    /* Modify above */
+	    System.out.println("x + y = " + sum);
+	    System.out.println("x - y = " + rest);
+	    System.out.println("x / y = " + div + ", did you expect this?");
+	    System.out.println("x * y = " + prod + ", did you expect this?");
+	  }
+	}
diff --git a/src/datatypes/Primitives3.java b/src/datatypes/Primitives3.java
new file mode 100644
index 0000000..2f668b5
--- /dev/null
+++ b/src/datatypes/Primitives3.java
@@ -0,0 +1,28 @@
+package datatypes;
+import java.text.NumberFormat;
+
+public class Primitives3 {
+
+	  public static void main(String[] args) {
+	    /* Modify below */
+
+	    // Create an 'int' variable named 'x' with the value '900_000_000'
+
+	    // Create an 'int' variable named 'y' with the value '700_000_000'
+
+	    // Fix this
+	    int sum = x + y;
+	    int rest = x - y;
+	    int div = x / y;
+	    int prod = x * y;
+
+	    /* Modify above */
+	    var nf = NumberFormat.getInstance();
+	    nf.setGroupingUsed(true);
+
+	    System.out.println("x + y = " + nf.format(sum));
+	    System.out.println("x - y = " + nf.format(rest));
+	    System.out.println("x / y = " + nf.format(div) + ", did you expect this?");
+	    System.out.println("x * y = " + nf.format(prod) + ", did you expect this?");
+	  }
+	}
diff --git a/src/datatypes/Primitives4.java b/src/datatypes/Primitives4.java
new file mode 100644
index 0000000..33e194f
--- /dev/null
+++ b/src/datatypes/Primitives4.java
@@ -0,0 +1,30 @@
+package datatypes;
+
+import java.text.NumberFormat;
+
+public class Primitives4 {
+
+	  public static void main(String[] args) {
+	    /* Modify below */
+
+	    // Create a 'long' variable named 'x' with the value '4_000_000_000_000_000_000L'
+
+	    // Create a 'long' variable named 'y' with the value '3_000_000_000_000_000_000L'
+
+	    // Fix this
+	    long sum = x + y;
+	    long rest = x - y;
+	    long div = x / y;
+	    long prod = x * y;
+
+	    /* Modify above */
+
+	    var nf = NumberFormat.getInstance();
+	    nf.setGroupingUsed(true);
+
+	    System.out.println("x + y = " + nf.format(sum));
+	    System.out.println("x - y = " + nf.format(rest));
+	    System.out.println("x / y = " + nf.format(div) + ", did you expect this?");
+	    System.out.println("x * y = " + nf.format(prod) + ", did you expect this?");
+	  }
+	}
diff --git a/src/datatypes/Primitives5.java b/src/datatypes/Primitives5.java
new file mode 100644
index 0000000..a3c6976
--- /dev/null
+++ b/src/datatypes/Primitives5.java
@@ -0,0 +1,31 @@
+package datatypes;
+
+public class Primitives5 {
+
+	  public static void main(String[] args) {
+	    /* Modify below */
+
+	    // Create a 'float' variable named 'x' with the value '21.8F'
+
+	    // Create a 'float' variable named 'y' with the value '7.4F'
+
+	    // Fix this
+	    float sum = x + y;
+	    float rest = x - y;
+	    float div = x / y;
+	    float prod = x * y;
+
+	    /* Modify above */
+	    System.out.println("x + y = " + sum);
+	    System.out.println("x - y = " + rest);
+	    System.out.println("x / y = " + div);
+	    System.out.println("x * y = " + prod);
+	    System.out.println("""
+	                
+	        Some floating point operations can result in numbers
+	        with strange decimal places.
+	                
+	        You have to keep that in mind when doing calculations.
+	        """);
+	  }
+	}
diff --git a/src/datatypes/Primitives6.java b/src/datatypes/Primitives6.java
new file mode 100644
index 0000000..9b7646d
--- /dev/null
+++ b/src/datatypes/Primitives6.java
@@ -0,0 +1,31 @@
+package datatypes;
+
+public class Primitives6 {
+
+	  public static void main(String[] args) {
+	    /* Modify below */
+
+	    // Create a 'double' variable named 'x' with the value '21.8'
+
+	    // Create a 'double' variable named 'y' with the value '7.4'
+
+	    // Fix this
+	    double sum = x + y;
+	    double rest = x - y;
+	    double div = x / y;
+	    double prod = x * y;
+
+	    /* Modify above */
+	    System.out.println("x + y = " + sum);
+	    System.out.println("x - y = " + rest);
+	    System.out.println("x / y = " + div);
+	    System.out.println("x * y = " + prod);
+	    System.out.println("""
+	                
+	        Some floating point operations can result in numbers
+	        with strange decimal places.
+	                
+	        You have to keep that in mind when doing calculations.
+	        """);
+	  }
+	}
\ No newline at end of file
diff --git a/src/datatypes/Primitives7.java b/src/datatypes/Primitives7.java
new file mode 100644
index 0000000..edd92c8
--- /dev/null
+++ b/src/datatypes/Primitives7.java
@@ -0,0 +1,28 @@
+package datatypes;
+
+public class Primitives8 {
+
+	  public static void main(String[] args) {
+	    /* Modify below */
+
+	    // Create a 'char' variable named 'x' with the value 'X'
+
+	    // Create a 'char' variable named 'y' with the value 'Y'
+
+	    // Fix this
+	    char concat = x + y;
+	    var multipleChars = "" + x + y; // Do not change this line
+
+	    /* Modify above */
+	    System.out.println("x has the value: " + x + "\n    x is of type: " + getType(x));
+	    System.out.println("\ny has the value: " + y + "\n    y is of type: " + getType(y));
+	    System.out.println("\nx + y = " + concat + "\n    concat is of type: " + getType(concat));
+	    System.out.println(
+	        "\n\"\" + x + y = " + multipleChars + "\n    multipleChars is of type: " + getType(multipleChars));
+	    System.out.println("\nDid you expect these results?");
+	  }
+
+	  private static String getType(Object value) {
+	    return value.getClass().getName();
+	  }
+	}
diff --git a/src/datatypes/Primitives8.java b/src/datatypes/Primitives8.java
new file mode 100644
index 0000000..edd92c8
--- /dev/null
+++ b/src/datatypes/Primitives8.java
@@ -0,0 +1,28 @@
+package datatypes;
+
+public class Primitives8 {
+
+	  public static void main(String[] args) {
+	    /* Modify below */
+
+	    // Create a 'char' variable named 'x' with the value 'X'
+
+	    // Create a 'char' variable named 'y' with the value 'Y'
+
+	    // Fix this
+	    char concat = x + y;
+	    var multipleChars = "" + x + y; // Do not change this line
+
+	    /* Modify above */
+	    System.out.println("x has the value: " + x + "\n    x is of type: " + getType(x));
+	    System.out.println("\ny has the value: " + y + "\n    y is of type: " + getType(y));
+	    System.out.println("\nx + y = " + concat + "\n    concat is of type: " + getType(concat));
+	    System.out.println(
+	        "\n\"\" + x + y = " + multipleChars + "\n    multipleChars is of type: " + getType(multipleChars));
+	    System.out.println("\nDid you expect these results?");
+	  }
+
+	  private static String getType(Object value) {
+	    return value.getClass().getName();
+	  }
+	}
diff --git a/src/datatypes/Strings1.java b/src/datatypes/Strings1.java
new file mode 100644
index 0000000..5f6630b
--- /dev/null
+++ b/src/datatypes/Strings1.java
@@ -0,0 +1,24 @@
+package datatypes;
+
+public class Strings1 {
+
+	  public static void main(String[] args) {
+	    /* Modify below */
+
+	    // Create a 'String' variable named 'javalings' with the value 'javalings'
+
+	    // Create a 'String' variable named 'exercise' with the value 'exercise'
+
+	    String concat = javalings + exercise;
+	    String concatWithSpaces = javalings + " " + exercise;
+	    String concatFormatted = "%s %s".formatted(javalings, exercise);
+	    String concatFormattedOld = String.format("%s %s", javalings, exercise);
+
+	    /* Modify above */
+	    System.out.println("concat              = " + concat);
+	    System.out.println("concatWithSpaces    = " + concatWithSpaces);
+	    System.out.println("concatFormatted     = " + concatFormatted);
+	    System.out.println("concatFormattedOld  = " + concatFormattedOld);
+
+	  }
+	}
diff --git a/src/module-info.java b/src/module-info.java
new file mode 100644
index 0000000..6d0bdb7
--- /dev/null
+++ b/src/module-info.java
@@ -0,0 +1,8 @@
+/**
+ * 
+ */
+/**
+ * 
+ */
+module javalings {
+}
\ No newline at end of file
diff --git a/src/variables/Variables1.java b/src/variables/Variables1.java
new file mode 100644
index 0000000..c612d96
--- /dev/null
+++ b/src/variables/Variables1.java
@@ -0,0 +1,18 @@
+package variables;
+
+public class Variables1 {
+	public static void main(String[] args) {
+	    /* Modify below */
+
+	    // Create a 'byte' variable named 'smallest' with the value '100'
+
+	    // Create a 'short' variable named 'small' with the value '30000'
+
+	    // Create an 'int' variable named 'medium' with the value '1000000000'
+
+		// modify the above
+		System.out.println("smallest has the value : " + smallest);
+		System.out.println("small has the value : " + small);
+		System.out.println("medium has the value : " + medium);
+	}
+}
diff --git a/src/variables/Variables2.java b/src/variables/Variables2.java
new file mode 100644
index 0000000..5f76524
--- /dev/null
+++ b/src/variables/Variables2.java
@@ -0,0 +1,19 @@
+package variables;
+
+public class Variables2 {
+
+  public static void main(String[] args) {
+    /* Modify below */
+
+    // Create a 'float' variable named 'precision' with the value '42.42F'
+
+    // Create a 'double' variable named 'doublePrecision' with the value '123.321D'
+
+    // Create a 'long' variable named 'hugeNumber' with the value '123456789987654321L'
+
+    /* Modify above */
+    System.out.println("floatingPointNumber has the value : " + precision);
+    System.out.println("doubleFloatingPointNumber has the value : " + doublePrecision);
+    System.out.println("hugeNumber has the value : " + hugeNumber);
+  }
+}
diff --git a/src/variables/Variables3.java b/src/variables/Variables3.java
new file mode 100644
index 0000000..d27a3cb
--- /dev/null
+++ b/src/variables/Variables3.java
@@ -0,0 +1,20 @@
+package variables;
+
+public class Variables3 {
+
+  public static void main(String[] args) {
+    /* Modify below */
+
+    // Create a 'boolean' variable named 'trueFalse' with the value 'true'
+
+    // Create a 'char' variable named 'character' with the value 'D'
+
+    // Create a 'String' variable named 'text' with the value 'Hello there!'
+
+
+    /* Modify above */
+    System.out.println("trueFalse has the value : " + trueFalse);
+    System.out.println("character has the value : " + character);
+    System.out.println("text has the value : " + text);
+  }
+}
\ No newline at end of file