All the programs are tested and provided with the output. If you new to java and want to learn java before trying out these program, then read my Core Java. Core Java tutorial: This tutorial will help you learn Java Programming in a simple and effective manner Java including tutorials on core java and advanced Java concepts and Java programming examples. Java Input/Output Tutorials . Material is very impressive, Please help me with PDF if you are having for the same. Download as PDF, TXT or read online from Scribd the no. of elements in the array, For example in the second case above when p is not Output: This java program finds if a number is odd or even. If the number is divisible by 2 then it . lot of java beginners to understand the basic fundamentals in Java programming.
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ruthenpress.info - Download as PDF File .pdf), Text File .txt) or read online. ruthenpress.info Core Java notes. Uploaded by. Gautam. This book is intended for people with at least some basic programming back- ground, which includes An Output icon highlights what the same HTML code looks like when viewed by For example, a printing code of shows that the. Sep 12, This App contains + Core JAVA Tutorial Programs with output. Java Examples App app helps you to refer a great collection java.
Finally, there is a call to constructor. This call initializes the new object. I would suggest you to see this Java class video which will take you through in-depth details of Java classes and the different key-components in Java.
Go ahead, enjoy the video and tell me what you think. An array is a data structure which holds the sequential elements of the same type. This will ease your task and minimizes the redundancy. Each array has two components: index and value. Multi—dimension Array: In a multi-dimension array, your data is stored in a matrix form. Refer to the below image where I have stored data with respect to different dimensions. Thus, arrays help you in optimizing the code where you can insert the data at any location.
I hope you guys are clear with how an array looks like and how do you initialize one. Java Tutorial: Structure of a Program Till now, we have learned about member variables, data types, control statements, classes and objects. Inheritance is a process where one class acquires the properties of another.
But whose properties are inherited? It is also referred as derived class or a subclass. Encapsulation: Encapsulation in Java is a mechanism of wrapping up the data and code together as a single unit. Refer to the below image where all your methods, variables are binded together in a single class.
In encapsulation, the variables of a class will be hidden from other classes, and can be accessed only through the methods of their current class.
Polymorphism: Polymorphism is the ability of a variable, function or object to take multiple forms. The most common use of polymorphism in OOPs occur when a parent class is used to refer a child class object.
Polymorphism is also achieved through function overloading. I will be explaining the whole concept in my next blog. Now based on the values that I have passed to these functions, it will draw different shapes. Based on the values you pass, different function will be called that serve different purposes. So this can be achieved through function overloading. Stay tuned, the concept of function overloading will be covered in detail in my next blog.
Abstraction: It is basically the quality of dealing with ideas rather than events. Abstraction is the methodology of hiding the implementation details from the user and only providing the functionality to the users.
Modify your program called TestPalindromicPhrase to check for palindromic phrase.
Use in. Hints Maintain two indexes, forwardIndex fIdx and backwardIndex bIdx , to scan the phrase forward and backward. Skip the index if it does not contain a letter. Write a program called CheckBinStr to verify a binary string. The program shall prompt user for a binary string; and decide if the input string is a valid binary string. For example, Enter a binary string: "" is a binary string Enter a binary string: "" is NOT a binary string Hints Use the following coding pattern which involves a boolean flag to check the input string.
Write a program to verify a hex string. The program shall prompt user for a hex string; and decide if the input string is a valid hex string. Your output shall look like: Enter a Binary string: The equivalent decimal number for binary "" is: 11 Enter a Binary string: error: invalid binary string "" Hints See "Code Example".
Your output shall look like: Enter a Hexadecimal string: 1a The equivalent decimal number for hexadecimal "1a" is: 26 Enter a Hexadecimal string: 1y3 error: invalid hexadecimal string "1y3" Hints See "Code Example".
Enter the radix: 16 Enter the string: 1a The equivalent decimal number "1a" is: 26 Exercises on Array PrintArray Array Write a program called PrintArray which prompts user for the number of items in an array a non-negative integer , and saves it in an int variable called numItems. It then prompts user for the values of all the items and saves them in an int array called items.
The program shall then print the contents of the array in the form of [x1, x2, It then prompts user for the values of all the items non-negative integers and saves them in an int array called items. The program shall then print the contents of the array in a graphical form, with the array index and values represented by number of stars. GradesStatistics Array Write a program which prompts user for the number of students in a class a non-negative integer , and saves it in an int variable called numStudents.
It then prompts user for the grade of each of the students integer between 0 to and saves them in an int array called grades. Enter the number of students: 5 Enter the grade for student 1: 98 Enter the grade for student 2: 78 Enter the grade for student 3: 78 Enter the grade for student 4: 87 Enter the grade for student 5: 76 The average is: Dec2Hex Array for Table Lookup Write a program called Dec2Hex that prompts user for a positive decimal number, read as int, and print its equivalent hexadecimal string.
The output shall look like: Enter a decimal number: The equivalent hexadecimal number is 4D2 Hints Exercises on Method exponent method Write a method called exponent int base, int exp that returns an int value of base raises to the power of exp. The signature of the method is: public static int exponent int base, int exp ; Assume that exp is a non-negative integer and base is an integer.
Do not use any Math library functions. Also write the main method that prompts user for the base and exp; and prints the result. For example, Enter the base: 3 Enter the exponent: 4 3 raises to the power of 4 is: 81 Hints The signature of the method is as follows: public static boolean isOdd int number ; Also write the main method that prompts user for a number, and prints "ODD" or "EVEN".
You should test for negative input. For examples, Enter a number: 9 9 is an odd number Enter a number: 8 8 is an even number Enter a number: -5 -5 is an odd number Hints See Notes.
The signature of the method is as follows: public static boolean hasEight int number ; Write a program called MagicSum, which prompts user for integers or -1 to end , and produce the sum of numbers containing the digit 8.
Your program should use the above methods. Take note that there is no comma after the last element.
In other words, every class is a subclass of and inherits from Object. But what does it mean to say that our class inherits from its superclass es? It simply means that Adult has access to the exposed variables and methods in its superclasses. In this case, it means that Adult can see and use the following from any of its superclasses we have only one at the moment : public methods and variables protected methods and variables Package protected methods and variables that is, those without an access specifier , if the superclass is in the same package as Adult Constructors are special.
To be accurate, overriding a variable hides it, and overriding a method simply overrides it, but the effect is the same: The overridden member is essentially hidden. You can still get to the members of the superclass by using the super keyword: super. Defining a class hierarchy Suppose we have another class called Baby. That kind of code duplication makes maintaining code more painful than it needs to be.
We can create a superclass, move all the common elements up to that class, and remove the code duplication. We can cast an Adult to type Person, then call a Person method on it. Because we have this hierarchy, the code on our subclasses is simpler. But do you see a problem here? Now all Adults and all Babys excuse the bad plural will talk and move in the same way.
What we really want is a way to force each of our subclasses to move and talk in its own particular way. Abstraction In an OO context, abstraction refers to the act of generalizing data and behavior to a type higher up the hierarchy than the current class. Those are general terms, and they apply in the Java language. But the language also adds the concepts of abstract classes and abstract methods. For example, you might create a class called Animal.
But all Animals have some things in common, such as the ability to make noise. The noise it makes depends on the kind of animal it is. How do you model that? You define the common stuff on the abstract class, and you force subclasses to implement concrete behavior specific to their types. You can have both abstract and concrete classes in your hierarchies. We can do that by defining the methods on Person to be abstract. Then our subclasses will have to implement those methods.
We changed Person to make the methods abstract, forcing subclasses to implement them. We made Adult subclass Person, and implemented the methods. We made Baby subclass Person, and implemented the methods.
When you declare a method to be abstract, you require subclasses to implement the method, or to be abstract themselves and pass along the implementation responsibility to their subclasses.
You can implement some methods on an abstract class, and force subclasses to implement others. If a subclass fails to implement an abstract method from a superclass, the compiler will complain. Now that both Adult and Baby subclass Person, we can refer to an instance of either class as being of type Person.
Refactoring to abstract behavior We now have Person, Adult, and Baby in our hierarchy. But notice that the behavior is the same again. It makes sense to refactor the code to remove this code duplication. The most likely refactoring is to move move to Person. This is a simplistic example, so this back-and-forth might seem wasteful.
But what we just experienced is a common occurrence when you write Java code. You often see classes and methods change as your system grows, and sometimes you end up with code duplication that you can refactor to superclasses. You might even do that, decide it was a mistake, and put the behavior back down in the subclasses. You learn the right place for behavior as you go. When to abstract … and when not to Deciding when to abstract or create a hierarchy is a hotly debated topic in OO circles, especially among Java language programmers.
Certainly there are few right and wrong answers about how to structure class hierarchies. This is an area where conscientious and skilled practitioners can and often do disagree.
That said, there are some good rules of thumb to follow with regard to hierarchies. Wait until the code tells you that you should. It is almost always better to refactor your way to an abstraction than to assume that you need it at the outset. Many Java programmers overuse hierarchies. Second, resist the use of abstract classes when you can. We used an abstract class to force our subclasses to implement certain behavior. Quite possibly. You might have a method defined three or four classes up the chain.