Task - Java Overview - Compilation and Execution of a Java Program

[akash-coded]

Create a Java program, such as HelloWorld.java, or any other simple Java program.

Demonstrate compiling the source code with the javac command.

Demonstrate executing the generated bytecode using the java command.

Bonus

Include multiple classes in a Java program file, and compile it. Run the program using the bytecode containing the main() method.

[Sanjayee]

Calc.java

class calculate
{
    public void add(int a,int b)
    {
        int sum=a+b;
        System.out.println("Value is= "+sum);
    }
    public void sub(int a,int b)
    {
        int sub=a-b;
        System.out.println("value is "+sub);
    }
    public void mul(int a,int b)
    {
        int mul=a*b;
        System.out.println("Value is= "+mul);

    }
}
public class Calc {
    public static void main(String[] args)
    {
        calculate c=new calculate();
        c.add(2,3);
        c.sub(3,2);
        c.mul(3,4);
    }
}

Before compilation

No class files has been created only the source code is available

Compilation

The Class files of the two classes Calc and calculate has been created.

After compilation

Now the class files can be seen in the folder for the Calc.java code

Interpretation

Now the class files of the Source code (Calc.java) has been Interpreted and the result has been displayed

[RajkapoorR]

Compilation with Multiple class

Interpretation

[naveenkarthik-klu]

FactorialMain.java

class Factorial {
    int calcFactorial(int n) {
        int f = 1, i;
        for (i = 1; i <= n; i++) {
            f = f * i;
        }
        return f;
    }
}

public class FactorialMain {
    public static void main(String[] args) {
        Factorial f = new Factorial();
        System.out.println("Factorial of 5 is " + f.calcFactorial(5));
    }
}

Before compilation

After compilation

Interpretation

[Karthick-code]

Compilation with multiple classes

Interpretation

[kadhalish]

Compilation of Java File with multiple class

---

Execution of main method

---

[Maha1805]

DEMONSTRATING THE EXECUTION OF A JAVA PROGRAM

VehicleDemo.java

class Car
{
    static void run1()
    {
        System.out.println("CAR IS RUNNING");
    }
}
class Bike
{
    static void run2()
    {
        System.out.println("BIKE IS RUNNING");
    }
}
class Bus
{
   static void run3()
    {
        System.out.println("BUS IS RUNNING");
    }
}
public class VehicleDemo
{
    public static void main(String ar[])
    {
        Car.run1();
        Bike.run2();
        Bus.run3();
    }
}

OUTPUT

COMPILATION

INTERPRETATION

EXECUTION OF A JAVA PROGRAM

FILES

BEFORE COMPILATION-Java file is present

AFTER COMPILATION-Class files generated

[abitha05]

Compilation and Execution

class MySample{
    public static void  method(){
           System.out.println("Hello");
    }
    
}
class Test{
    public void service(){
        System.out.println("Welcome all!");
    }
}
class Example{
    private void run(){
        System.out.println("java program");
    }
}
public class SampleProgm{
    public static void main(String[] args) {
             MySample.method();
             System.out.println("Sample is compiled");
        
    }
     
}

OUTPUT:

Before Compilation

After Compilation

Interpretation

Files

[Nithy26]

Shape.java

class Rectangle{
    static void display(){
        System.out.println("Shape of the object is rectangle...");
    }
}
class Triangle{
    static void display1(){
        System.out.println("Shape of the object is triangle...");
    }
}
class Circle{
    static void display2(){
        System.out.println("Shape of the object is circle..."); 
    }
}
public class Shape{
    public static void main(String[] args){
        System.out.println("Shapes...");
        Rectangle.display();
        Triangle.display1();
        Circle.display2();
    }
}

Before Compilation

After Compilation

Interpretation

[Vijey-A]

Before Compilation with multiple class

After Compilation

two class file has been created.

Interpretation

[Shalini-Venugopal]

Compilation

Interpretation

[lakshmiparkav]

Compilation

Interpretation

[sarathaselvam24]

Before Compilation

After Compilation

Interpretation

[Tamilarasi-palanisamy]

Compilation with multiple class:

Interpretation:

[Nirmalkumara99]

Before Compilation

After Compilation

Interpretation

[premkumar-selvam]

Before Compilation

After Compilation

Interpretation