Simple coding in java

Java Programs – 500+ Simple & Basic Programs With Outputs

Java programs: Basic Java programs with examples & outputs. Here we covered over the list of 500+ Java simple programs for beginners to advance, practice & understood how java programming works. You can take a pdf of each program along with source codes & outputs.

In case if you are looking out for C Programs, you can check out that link.

We covered major Simple to basic Java Programs along with sample solutions for each method. If you need any custom program you can contact us.

All of our Sample Java programs with outputs in pdf format are written by expert authors who had high command on Java programming. Even our Java Tutorials are with rich in-depth content so that newcomers can easily understand.

1. EXECUTION OF A JAVA PROGRAM

Static loading : A block of code would be loaded into the RAM before it executed ( i.e after being loaded into the RAM it may or may not get executed )

Dynamic loading: A block of code would be loaded into the RAM only when it is required to be executed.

Note: Static loading took place in the execution of structured programming languages. EX: c- language

Java follows the Dynamic loading

– JVM would not convert all the statements of the class file into its executable code at a time.

– Once the control comes out from the method, then it is deleted from the RAM and another method of exe type will be loaded as required.

– Once the control comes out from the main ( ), the main ( ) method would also be deleted from the RAM. This is why we are not able to view the exe contents of a class file.

Simple Hello Word Program

Out of 500+ Simple & Basic Java Programs: Hello world is a first-ever program which we published on our site. Of course, Every Java programmer or C programmer will start with a “Hello World Program”. Followed by the rest of the programs in different Categories.

Basic Java Programs – Complete List Here

Advanced Simple Programming Examples With Sample Outputs

String, Array Programs

Sort Programs

Conversion Programs:

Star & Number Pattern Programs

Functions of JVM:

• It converts the required part if the bytecode into its equivalent executable code.
• It loads the executable code into the RAM.
• Executes this code through the local operating system.
• Deletes the executable code from the RAM.

We know that JVM converts the class file into its equivalent executable code. Now if a JVM is in windows environment executable code that is understood by windows environment only.

Similarly, same in the case with UNIX or other or thus JVM ID platform dependent.

Java, With the help of this course, students can now get a confidant to write a basic program to in-depth algorithms in C Programming or Java Programming to understand the basics one must visit the list 500 Java programs to get an idea.

Users can now download the top 100 Basic Java programming examples in a pdf format to practice.

But the platform dependency of the JVM is not considered while saying Java is platform independent because JVM is supplied free of cost through the internet by the sun microsystems.

Platform independence :

Compiled code of a program should be executed in any operating system, irrespective of the as in OS in which that code had been generated. This concept is known as platform independence.

• The birth of oops concept took place with encapsulation.
• Any program contains two parts.
• Date part and Logic part
• Out of data and logic the highest priority we have given to data.
• But in a structured programming language, the data insecurity is high.
• Thus in a process, if securing data in structured prog. lang. the concept of encapsulation came into existence.

Note: In structured programming lang programs, the global variable play a vital role.

But because of these global variables, there is data insecurity in the structured programming lang programs. i.e functions that are not related to some variables will have access to those variables and thus data may get corrupted. In this way data is unsecured.

“This is what people say in general about data insecurity. But this is not the actual reason. The actual concept is as follows”.

Let us assume that, we have a ‘C’ program with a hundred functions. Assume that it is a project. Now if any upgradation is required, then the client i.e the user of this program (s/w) comes to its company and asks the programmers to update it according to his requirement.

Now we should note that it is not guaranteed that the programmers who developed this program will still be working with that company. Hence this project falls into the hands of new programmers.

Automatically it takes a lot of time to study. The project itself before upgrading it. It may not be surprising that the time required for writing the code to upgrade the project may be very less when compared to the time required for studying the project.

Thus maintenance becomes a problem.

If the new programmer adds a new function to the existing code in the way of upgrading it, there is no guarantee that it will not affect the existing functions in the code. This is because of global variables. In this way, data insecurity is created.

• To overcome this problem, programmers developed the concept of encapsulation .
• For example, let us have a struc.prog.lang. program with ten global variables and twenty functions.
• It is sure that all the twenty functions will not use all the global variables.

Three of the global variables may be used only by two functions. But in a structured prog. Lang like ‘C’ it is not possible to restrict the access of global variables by some limited no of functions.

Every function will have access to all the global variables.

To avoid this problem, programmers have designed a way such that the variables and the functions which are associated with or operate on those variables are enclosed in a block and that bock is called a class and that class and that class is given a name, Just as a function is given a name.

Now the variables inside the block cannot be called as the local variable because they cannot be called as global variables because they are confined to a block and not global.

Hence these variables are known as instance variables

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Simple Java Programs for Beginners Example

Simple Java Programs for Beginners Example: If you’re looking to get into coding, learning Java is a great place to start. It’s a stable and popular programming language that can be used in many different industries. And once you know how to code in Java, it becomes easier to reuse that code for other purposes.

In this article, we will explore some of the Simple Java Programs for understanding the fundamentals of basic Java programming. Java is a versatile language that can be used for building a variety of applications. In order to code in Java, everything must be contained within a class. Once you have created your class, you can save it with a .java extension.

Coding-related questions are common in interviews, so it is beneficial to have a strong foundation in the basics of Java programming. In order to increase your coding skills or knowledge, you can check this Simple Java Program for Beginners with Examples and output.

Post Type:	Java Programs For Beginners
Published On:	www.softwaretestingo.com
Applicable For:	Freshers & Experience
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Simple Java Programs for Beginners

How to Write Text File Using Jautva Selenium With Example Program?

package com.selenium.mix; import java.io.BufferedWriter; import java.io.File; import java.io.FileWriter; import java.io.IOException; public class WriteTextFile < public static void main(String[] args) throws IOException < // TODO Auto-generated method stub File f=new File("G:\\Git_Base_Folder\\softwaretestingblog\\Selenium\\src\\com\\selenium\\mix\\Selenium Text"); FileWriter fw=new FileWriter(f); BufferedWriter bw=new BufferedWriter(fw); bw.write("Welcome to My Testing Blof"); bw.newLine(); bw.write("www.softwareteastingblog.in"); bw.close(); >>

Write a Program To Find out Parent Reference Implementation.

package com.java.Softwaretestingblog; class ab < public void a() < System.out.println("Inside Method A"); >> public class ParentReference extends ab < public void a() < System.out.println("Inside Overriding Method A"); >public void b() < System.out.println("Inside Method B"); >@SuppressWarnings("unused") public static void main(String[] args) < //ab obj=new ab(); //obj.a(); ab abc=new ParentReference(); abc.a(); ParentReference abx=new ParentReference(); //abx.a(); //abx.b(); //ParentReference aby=new ab(); >>

Execution: The Parent Reference Final output link

Inside Overriding Method A

How to Remove Spaces From Sentence In Java With Example?

package com.java.Softwaretestingblog; public class RemoveSpaceInASentence < public static void main(String[] args) < // Remove Spaces Java Program String str = "For More Testing Interview Questions Visit Software Testing Blog "; System.out.println("Entered String:- "+str); //1. Using replaceAll() Method String strWithoutSpace = str.replaceAll("\\s", ""); System.out.println("Remove Space With Using Replaceall Method:- "+strWithoutSpace); //Output : ForMoreTestingInterviewQuestionsVisitSoftwareTestingBlog //2. Without Using replaceAll() Method char[] strArray = str.toCharArray(); StringBuffer sb = new StringBuffer(); for (int i = 0; i < strArray.length; i++) < if( (strArray[i] != ' ') && (strArray[i] != '\t') ) < sb.append(strArray[i]); >> System.out.println("After Remove The Space From The Sentence:- "+sb); //Output : CoreJavajspservletsjdbcstrutshibernatespring > >

Entered String:- For More Testing Interview Questions Visit Software Testing Blog Remove Space With Using Replaceall Method:- ForMoreTestingInterviewQuestionsVisitSoftwareTestingBlog After Remove The Space From The Sentence:- ForMoreTestingInterviewQuestionsVisitSoftwareTestingBlog

Write a Program to Find out Widening In Java Example Program?

package com.java.Softwaretestingblog; public class WideningExample < public static void main(String[] args) < // TODO Auto-generated method stub //Conversion lower ro higher is called wideining //byte->short->int->float->long->double int i = 100; //automatic type conversion long l = i; //automatic type conversion float f = l; System.out.println("Int value "+i); System.out.println("Long value "+l); System.out.println("Float value "+f); > >

Int value 100 Long value 100 Float value 100.0

Non-Repeated & First Repeated Character Using HashMap

How to Find First Repeated & Non-Repeated Character In Java?

package com.softwaretestingblog.programs; import java.util.HashMap; import java.util.Scanner; public class Non_Repeated_Character < static void firstRepeatedNonRepeatedChar(String inputString) < //Creating a HashMap containing char as a key and occurrences as a value HashMapcharCountMap = new HashMap(); //Converting inputString to char array char[] strArray = inputString.toCharArray(); //Checking each char of strArray for (char c : strArray) < if(charCountMap.containsKey(c)) < //If char is present in charCountMap, incrementing it's count by 1 charCountMap.put(c, charCountMap.get(c)+1); >else < //If char is not present in charCountMap, //adding this char in charCountMap with 1 as it's value charCountMap.put(c, 1); >> //checking for first non-repeated character for (char c : strArray) < if (charCountMap.get(c) == 1) < System.out.println("First Non-Repeated Character In '"+inputString+"' is '"+c+"'"); break; >> //checking for first repeated character for (char c : strArray) < if (charCountMap.get(c) >1) < System.out.println("First Repeated Character In '"+inputString+"' is '"+c+"'"); break; >> > public static void main(String[] args) < @SuppressWarnings("resource") Scanner sc = new Scanner(System.in); System.out.println("Enter the string :"); String input = sc.next(); firstRepeatedNonRepeatedChar(input); >>

Differential Object Java Program

Simple Java Program Object With Example?

package com.java.Softwaretestingblog; class top < int b=20; void m1() < System.out.println("Inside Super Class"); >> public class DifferentialObject < public static void main(String[] args) < // TODO Auto-generated method stub new top(); new top().b=30; //System.out.println(b); //Differential Objects Can't be Outside top obj=new top(); obj.b=30; System.out.println("The Value Of B:- "+obj.b); >>

How to Find Pair Elements In an Array In Java With Example Program?

package com.softwaretestingblog.programs; public class PairOfElementsInArray < static void findThePairs(int inputArray[], int inputNumber) < System.out.println("Pairs of elements whose sum is "+inputNumber+" are : "); for (int i = 0; i < inputArray.length; i++) < for (int j = i+1; j < inputArray.length; j++) < if(inputArray[i]+inputArray[j] == inputNumber) < System.out.println(inputArray[i]+" + "+inputArray[j]+" EnlighterJSRAW" data-enlighter-language="null" data-enlighter-theme="" data-enlighter-highlight="" data-enlighter-linenumbers="" data-enlighter-lineoffset="" data-enlighter-title="" data-enlighter-group="">Pairs of elements whose sum is 10 are : 4 + 6 = 10 5 + 5 = 10 -10 + 20 = 10

Write a Program to Find Distinct Element Using POJO [Getter & Setter] Class Java?

package com.java.Softwaretestingblog; import java.util.HashSet; public class FindDistinctElement < public static void main(String[] args) < // TODO Auto-generated method stub HashSetlhm = new HashSet(); lhm.add(new Price("Banana", 20)); lhm.add(new Price("Apple", 40)); lhm.add(new Price("Orange", 30)); for(Price pr:lhm) < System.out.println(pr); >Price duplicate = new Price("Banana", 20); System.out.println("inserting duplicate object. "); lhm.add(duplicate); System.out.println("After insertion:"); for(Price pr:lhm) < System.out.println(pr); >> > class Price < private String item; private int price; public Price(String itm, int pr)< this.item = itm; this.price = pr; >public int hashCode() < System.out.println("In hashcode"); int hashcode = 0; hashcode = price*20; hashcode += item.hashCode(); return hashcode; >public boolean equals(Object obj) < System.out.println("In equals"); if (obj instanceof Price) < Price pp = (Price) obj; return (pp.item.equals(this.item) && pp.price == this.price); >else < return false; >> public String getItem() < return item; >public void setItem(String item) < this.item = item; >public int getPrice() < return price; >public void setPrice(int price) < this.price = price; >public String toString() < return "item: "+item+" price: "+price; >>

In hashcode In hashcode In hashcode item: Apple price: 40 item: Orange price: 30 item: Banana price: 20 inserting duplicate object. In hashcode In equals After insertion: item: Apple price: 40 item: Orange price: 30 item: Banana price: 20

Write a Program to Find Out Sum Of Digits In Java Program?

package com.java.Softwaretestingblog; import java.util.Scanner; public class SumOfDigits < public static void main(String[] args) < // TODO Auto-generated method stub Scanner in=new Scanner(System.in); System.out.println("Enter the number"); int sum=0,n,a; n=in.nextInt(); while(n>0) < a=n%10; n=n/10; sum=sum+a; >System.out.println("Sum of digits EnlighterJSRAW" data-enlighter-language="null" data-enlighter-theme="" data-enlighter-highlight="" data-enlighter-linenumbers="" data-enlighter-lineoffset="" data-enlighter-title="" data-enlighter-group="">Enter the number: 1254 Sum of digits=12

How To Open Exe Files In Java Example Program?

package com.java.interviewFAQ; import java.io.IOException; public class RunExeFiles < public static void main(String[] args) throws IOException < Runtime.getRuntime().exec("C:\\Windows\\notepad.exe"); >>

This Java interview questions and answers tutorial will help you crack your next Java interview. We’ve covered Simple Java Programs questions and answers that are frequently asked by interviewer. With this guide, you’ll be ready to tackle any question thrown your way.

If you’re struggling with these java programs, please leave a comment below. In addition to this article on Simple Java Programs for Beginners, if you come across any other interview questions, please let us know in the comment section and we’ll update the article accordingly.

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