Create 02A Objects' methods

Week 4: Writing classes/02A Objects' methods

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+Once an object has been created by calling a constructor, the information content of the object 
+can be observed and modified through the public OPERATIONS it provides. 
+For example, as we know, a list has a public method add, which can be used to add an element to the list:
+
+ArrayList<Double> measurements = new ArrayList<>();
+measurements.add(2.5);
+measurements.add(14.0);
+measurements.add(-2.75);
+
+System.out.println(measurements);
+ 
+Program outputs:
+[2.5, 14.0, -2.75]
+ 
+ 
+
+
+
+
+Changing the data content of one object does not change the data content of other objects of the same class.
+Objects are therefore INDEPENDENT ENTITIES. 
+When we add one element to a list, the other lists of the same class do not change.
+
+ArrayList<Double> measurements1 = new ArrayList<>();
+ArrayList<Double> measurements2 = new ArrayList<>();
+
+measurements1.add(2.5);
+measurements1.add(14.0);
+measurements1.add(-2.75);
+
+measurements2.add(0.25);
+measurements2.add(0.75);
+
+System.out.println(measurements1);
+System.out.println(measurements2);
+ 
+
+Program outputs:
+[2.5, 14.0, -2.75]
+[0.25, 0.75]
+
+