JAVA – Care4you

Simple Project use of classes, copy constructor and aggregation

Ravinder Nath Rajotiya — Tue, 20 Apr 2021 12:23:29 +0000

A simple project Following Classes: 1. Student Class 2. Subject Class 3. ExamPaper Class Aggregation example: when you have field in one class that are also the object in another class, there comes a concept what is called aggregation. We can access those object members from this class object using aggregation concept. See code in...

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Copy Constructor in JAVA

Ravinder Nath Rajotiya — Mon, 19 Apr 2021 03:48:02 +0000

Copy Constructor in JAVA A copy constructor i a constructor that creates a copy of an existing object of the same class. It creates an object using another object of the same Java class. That’s helpful when we want to copy a complex object that has several fields, or when we want to make a...

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Classes and Objects in JAVA

Ravinder Nath Rajotiya — Sun, 18 Apr 2021 16:26:34 +0000

Classes and Objects in JAVA Everything that we see around us are objects for example people, metals, car, tree, bike, animals and so on. Every object belong to certain class. So, we have to understand their classification to differentiate among them. Class is way of describing some properities, functionality or behaviour of an objects. It...

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String Arrays in JAVA

Ravinder Nath Rajotiya — Sun, 18 Apr 2021 07:39:05 +0000

String arrays Steps: Step-1: Declare String object and call the methode getNames() Step-2: Use for loop to print Step-3: Inside for loop, check if the string is null Step-4: If string not null, then pring names usring Sysem.out.println(names[i]) Here after main() will be the method definition for getNames() Example-1: package com.example;...

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ArrayList Class in JAVA

Ravinder Nath Rajotiya — Sun, 18 Apr 2021 07:21:43 +0000

ArrayList class in JAVA We have already seen that arrays are of a fixed length and after they are created, they cannot grow or shrink. This meant the the programmer must know in advance about the size requirement of an array. ArrayList like arrays also allow object storage, but unlike array, the arrayList are created...

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