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The this keyword usage has a reason that field gets shadowed by constructor parameter or method.

For example the Point class is as following written:

Java Code:

public class Point {
    public int x = 0;
    public int y = 0;
        
    //constructor
    public Point(int a, int b) {
        x = a;
        y = b;
    }
}

However, other way to write it is;

Java Code:

public class Point {

...

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