Core java concepts

Comments are almost like C++ ,[object Object],[object Object],[object Object],[object Object],NSIT ,Jetalpur

JAVA Classes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],NSIT ,Jetalpur

An example of a class ,[object Object],[object Object],[object Object],[object Object],NSIT ,Jetalpur

Scoping As in C/C++, scope is determined by the placement of curly braces {}. A variable defined within a scope is available only to the end of that scope. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],NSIT ,Jetalpur This is ok in C/C++ but not in Java.

Scope of Objects ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],NSIT ,Jetalpur

The static keyword ,[object Object],[object Object],[object Object],[object Object],[object Object],NSIT ,Jetalpur class StaticTest {static int i = 47;} StaticTest st1 = new StaticTest(); StaticTest st2 = new StaticTest(); // st1.i == st2.I == 47 StaticTest.i++; // or st1.I++ or st2.I++ // st1.i == st2.I == 48

Example ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],NSIT ,Jetalpur

Array Operations ,[object Object],[object Object],[object Object],[object Object],NSIT ,Jetalpur

An array is an object ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],NSIT ,Jetalpur

Example Programs NSIT ,Jetalpur

Echo.java ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],NSIT ,Jetalpur

Factorial Example ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],NSIT ,Jetalpur

Constructors ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],NSIT ,Jetalpur

Methods, arguments and return values ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],NSIT ,Jetalpur

Core java concepts

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Core java concepts