updating docs
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YamiDoesDev
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## Table of Contents
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1. [Nutzung der Konsole](#nutzung-der-konsole)
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2. [Primitive Datentypen](#primitive-datentypen)
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3. [Nicht Primitive Datentypen](#)
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4. [Operatoren](#)
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5. [Bedingungen](#)
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6. [Schleifen](#)
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3. [Nicht Primitive Datentypen](#nicht-primitive-datentypen)
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4. [Operatoren](#operatoren)
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5. [Bedingungen](#bedingungen)
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6. [Schleifen](#schleifen)
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7. [Exceptions](#exceptions)
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## Nutzung der Konsole
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@ -108,17 +108,18 @@ System.out.println("concatString: " + concatString);
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```
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Methoden der Standardbibliothek:
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```java
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myString.charAt(); // Returns the char value at the specified index.
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myString.indexOf(); // Returns the index within this string of the first occurrence of the specified substring.
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myString.substring(); // Returns a string that is a substring of this string.
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myString.equals(); // Compares this string to the specified object.
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myString.toLowerCase(); // Converts all of the characters in this String to lower case.
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myString.toUpperCase(); // Converts all of the characters in this String to upper case.
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myString.contains(); // Returns true if and only if this string contains the specified sequence of char values.
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myString.replaceAll(); // Replaces each substring of this string that matches the given regular expression with the given replacement.
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myString.compareTo(); // Compares two strings lexicographically. The comparison is based on the Unicode value of each character in the strings.
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```
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| Methode | Beschreibung |
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|------------------------|-------------------------------------------------------------------------------------------------------------------------|
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| myString.charAt() | Returns the char value at the specified index. |
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| myString.indexOf() | Returns the index within this string of the first occurrence of the specified substring. |
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| myString.substring() | Returns a string that is a substring of this string. |
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| myString.equals() | Compares this string to the specified object. |
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| myString.toLowerCase() | Converts all of the characters in this String to lower case. |
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| myString.toUpperCase() | Converts all of the characters in this String to upper case. |
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| myString.contains() | Returns true if and only if this string contains the specified sequence of char values. |
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| myString.replaceAll() | Replaces each substring of this string that matches the given regular expression with the given replacement. |
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| myString.compareTo() | Compares two strings lexicographically. The comparison is based on the Unicode value of each character in the strings. |
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### Numeric Datatypes
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@ -144,14 +145,16 @@ myFloat.isNaN(); // Returns true if this Float value is a Not-a-Number (NaN), fa
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```
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Funktionen für alle Numerischen Datentypen (Nicht Primitiv):
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```java
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myNumber.compareTo(); // Compares two Integer objects numerically.
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myNumber.toString(); // Returns a String object representing this Integer's value.
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myNumber.intValue(); // Returns the value of this Integer as an int.
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myNumber.floatValue(); // Returns the value of this Integer as a float after a widening primitive conversion.
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myNumber.doubleValue(); // Returns the value of this Integer as a double after a widening primitive conversion.
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myNumber.shortValue(); // Returns the value of this Integer as a short after a narrowing primitive conversion.
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```
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| Methode | Beschreibung |
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|------------------------|---------------------------------------------------------------------------------------|
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| myNumber.compareTo() | Compares two Integer objects numerically. |
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| myNumber.toString() | Returns a String object representing this Integer's value. |
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| myNumber.intValue() | Returns the value of this Integer as an int. |
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| myNumber.floatValue() | Returns the value of this Integer as a float after a widening primitive conversion. |
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| myNumber.doubleValue() | Returns the value of this Integer as a double after a widening primitive conversion. |
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| myNumber.shortValue() | Returns the value of this Integer as a short after a narrowing primitive conversion. |
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### Arrays
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Bei Arrays handelt es sich um Schleifen eines bestimmten Datentypen. Sie werden
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@ -194,14 +197,15 @@ for(int row = 0; row < my2DArray.length; row++) {
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```
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Methoden:
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```java
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Arrays.toString(myArray); // a string representation of the object.
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Arrays.copyOf(myArray, 3); // Copies the specified array, truncating or padding with zeros (if necessary) so the copy has the specified length.
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Arrays.compare(myArray, myArray); // Compares two int arrays lexicographically.
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Arrays.equals(myArray, myArray); // Returns true if the two specified arrays of ints are equal to one another.
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Arrays.sort(myArray); // Sorts the specified array into ascending numerical order
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Arrays.fill(myArray, 0); // Assigns the specified int value to each element of the specified array of ints.
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```
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| Methode | Beschreibung |
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|-----------------------------------|-------------------------------------------------------------------------------------------------------------------|
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| Arrays.toString(Array a) | a string representation of the object. |
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| Arrays.copyOf(Array a, int index) | Copies the specified array, truncating or padding with zeros (if necessary) so the copy has the specified length. |
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| Arrays.compare(Array a, Array b) | Compares two int arrays lexicographically. |
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| Arrays.equals(Array a, Array b) | Returns true if the two specified arrays of ints are equal to one another. |
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| Arrays.sort(Array a) | Sorts the specified array into ascending numerical order |
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| Arrays.fill(Array a, int number) | Assigns the specified int value to each element of the specified array of ints. |
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## Operatoren
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@ -27,6 +27,26 @@ int nbr = 5;
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String name = new String("Thomas");
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```
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## Modifier
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Quelle: [w3schools.com](https://www.w3schools.com/java/java_modifiers.asp)
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### Access-Modifier
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| Modifier | Beschreibung |
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|-----------|--------------------------------------------------------------------------------------------------|
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| public | The code is accessible for all classes |
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| private | The code is only accessible within the declared class |
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| protected | The code is accessible in the same package and subclasses. |
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| default | The code is only accessible in the same package. This is used when you don't specify a modifier. |
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### Non-Access-Modifier
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| Modifier | Beschreibung |
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|----------|-------------------------------------------------------------------------------------------------------------------|
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| final | The class cannot be inherited by other classes |
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| abstract | The class cannot be used to create objects (To access an abstract class, it must be inherited from another class. |
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## #1 Einfache Objekte und Veerbung
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**Lernziele:**
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@ -65,46 +65,6 @@ public class Main /*extends Language implements Regex*/ {
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}
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```
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### Abstract and Interface
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```java
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// Regex.java
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public interface Regex {
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public String concatStrings(String left, String right);
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}
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```
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```java
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// Main.java
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abstract class Language {
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public void showLanguage() {
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System.out.println("This text is presented to you by Java");
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}
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public abstract void sayHelloWorld();
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}
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// Main.java
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public class Main extends Language implements Regex {
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public static void main(String[] args) {
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// Language myLanguage = new Language();
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// 'Language' is abstract; cannot be instantiated
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Main myObject = new Main();
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myObject.sayHelloWorld();
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String wortwitz = myObject.concatStrings("du", "schlampe");
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System.out.println(wortwitz); // duschlampe
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}
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@Override
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public void sayHelloWorld() {
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System.out.println("I refuse to say that!");
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}
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@Override
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public String concatStrings(String left, String right) {
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return left + right;
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}
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}
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```
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```java
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// SaveState.java
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@ -159,6 +119,47 @@ public class SaveState<T> implements Comparable<SaveState> {
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}
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```
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### Abstract and Interface
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```java
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// Regex.java
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public interface Regex {
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public String concatStrings(String left, String right);
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}
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```
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```java
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// Main.java
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abstract class Language {
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public void showLanguage() {
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System.out.println("This text is presented to you by Java");
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}
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public abstract void sayHelloWorld();
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}
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// Main.java
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public class Main extends Language implements Regex {
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public static void main(String[] args) {
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// Language myLanguage = new Language();
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// 'Language' is abstract; cannot be instantiated
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Main myObject = new Main();
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myObject.sayHelloWorld();
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String wortwitz = myObject.concatStrings("du", "schlampe");
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System.out.println(wortwitz); // duschlampe
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}
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@Override
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public void sayHelloWorld() {
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System.out.println("I refuse to say that!");
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}
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@Override
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public String concatStrings(String left, String right) {
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return left + right;
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}
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}
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```
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## Collections
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```java
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