this.<attributeName> = paramName;

Week 4: Writing classes/06a. Keyword this

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+So, the constructor is usually passed parameters, and it sets the values of the attributes according to these parameters. 
+
+For example, a class that models a book:
+class Book {
+    String name;
+    String writer;
+    int pages;
+    int releaseYear;
+
+    
+    public Book(String n, String w, int p, int ry) {
+        name = n;
+        writer = w;
+        pages = p;
+        releaseYear = ry;
+    }
+}
+ 
+
+In the example, you will notice that the PARAMETER NAMES are somewhat clumsy ABBREVIATIONS of the attribute names.
+Now, when calling the constructor, it is not at all clear what the parameters actually mean.
+
+
+-------------------------
+
+
+A better way is to USE the SAME IDENTIFIERS for parameters and attributes. 
+This can be done by using the keyword 'this':
+
+class Book {
+    String name;
+    String writer;
+    int pages;
+    int releaseYear;
+	
+    public Book(String name, String writer, int pages, int releaseYear) {
+        this.name = name;
+        this.writer = writer;
+        this.pages = pages;
+        this.releaseYear = releaseYear;
+    }
+}
+ 
+
+The keyword 'this' refers to the CURRENT OBJECT.
+
+Thus the entry
+'this.name'
+always refers to the attribute name of the object.
+
+
+In the constructor above, the statement
+this.name = name;
+sets the attribute value to the name received as a parameter. 
+In effect, the name given by the client is set as the value of the name field of the new object to be created.
+
+
+