this and super keyword in Java

Author: kishanrajput23

47.this_and_super_keyword/README.md

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+# this and super keyword in Java
+
+### this keyword in Java :
+- this is a way for us to reference an object of the class which is being created/referenced.
+- It is used to call the default constructor of the same class.
+- this keyword eliminates the confusion between the parameters and the class attributes with the same name. Take a look at the example given below :
+
+```
+class cwh{
+    int x;
+
+//    getter of x
+    public  int getX(){
+        return  x;
+    }
+
+    // Constructor with a parameter
+    cwh(int x) {
+        x = x;
+    }
+
+    // Call the constructor
+    public static void main(String[] args) {
+        cwh obj1 = new cwh(65);
+        System.out.println(obj1.getX());
+
+    }
+}
+```
+
+```
+Output :
+0
+```
+
+- In the above example, the expected output is 65 because we've passed x=65 to the constructor of the cwh class. But the compiler fails to differentiate between the parameter 'x' & class attribute 'x.' Therefore, it returns 0.
+
+- Now, let's see how we can handle this situation with the help of this keyword. Take a look at the below code :
+
+```
+class cwh1{
+    int x;
+
+//    getter of x
+    public  int getX(){
+        return  x;
+    }
+
+    // Constructor with a parameter
+    cwh(int x) {
+        this.x = x;
+    }
+
+    // Call the constructor
+    public static void main(String[] args) {
+        cwh obj1 = new cwh(65);
+        System.out.println(obj1.getX());
+
+    }
+}
+```
+
+```
+Output :
+65
+```
+
+- Now, you can see that we've got the desired output
+
+### Super keyword 
+- A reference variable used to refer immediate parent class object.
+- It can be used to refer immediate parent class instance variable.
+- It can be used to invoke the parent class method.
+
+ 
+### Code as described in the video:
+
+```
+import javax.print.Doc; 
+class EkClass{ 
+    int a; 
+    public int getA() { 
+        return a; 
+    }
+    
+    EkClass(int a) { 
+        this.a = a;
+    } 
+    
+    public int returnone() {
+        return 1; 
+    } 
+} 
+
+class DoClass extends EkClass { 
+    DoClass(int c) { 
+        super(c); 
+        System.out.println("I am a constructor"); 
+    } 
+} 
+    
+public class cwh_47_this_super { 
+    public static void main(String[] args) {
+        EkClass e = new EkClass(65); 
+        DoClass d = new DoClass(5); 
+        System.out.println(e.getA()); 
+    }
+}
+```
+
+**Handwritten Notes: [Click to Download](https://api.codewithharry.com/media/videoSeriesFiles/courseFiles/java-tutorials-for-beginners-47/JavaChapter10.pdf)**
+
+**Ultimate Java Cheatsheet: [Click To Download](https://api.codewithharry.com/media/videoSeriesFiles/courseFiles/java-tutorials-for-beginners-47/UltimateJavaCheatSheet.pdf)**