Java Programming Examples

Compile and Execute Java Online

java

public class Person {
  private String name; // private = restricted access

  // Getter
  public String getName() {
    return name;
  }

  // Setter
  public void setName(String newName) {
    this.name = newName;
  }
}

Compile and Execute Java Online

java

public class MyClass {
  public static void main(String[] args) {
    Person myObj = new Person();
    myObj.name = "John";  // error
    System.out.println(myObj.name); // error  
  }
}

Compile and Execute Java Online

java

import java.util.Scanner;
public class TempConverter{
public static void main(String [] args)
{
    float f, c;
    f = c = 0;
    int a;
    Scanner scan = new Scanner (System.in);
    System.out.println("Press 1 for C->F or 2 for F->C");
    a = scan.nextInt();
    if (a == 1) 
        convertCtoFAndPrint();
    else
convertFtoCAndPrint();
}

public static void convertFtoCAndPrint()
{
    f = c = 0;
    Scanner scan = new Scanner (System.in);
    System.out.println("Please enter degrees F");
    f = scan.nextFloat();
    c = (5/9)*(f-32);
    System.out.println(f + " degrees F is " + c + " degrees C.");
}

public static void convertCtoFAndPrint()
{
    Scanner scan = new Scanner (System.in);
    System.out.println("Please enter degrees C");
    c = scan.nextFloat();
    f = c*(9/5)+32;
    System.out.println(c + " degrees C is " + f + " degrees F.");
}

}

Multichannel

java

import java.io.*;
import java.util.*;

public class Multichannel
{    public static void main(String a[])throws IOException
{BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
Random r=new Random(0);
int i,j;
int arrivaltime[]={1,2,3,4};
double arrivalprob[]={0.25,0.40,0.20,0.15};
double cumarrival[]=new double[arrivalprob.length];
int arrivalrda[]=new int[arrivalprob.length];
int ableservice[]={2,3,4,5};
double ableprob[]={0.30,0.28,0.25,0.17};
double cumable[]=new double[ableprob.length];
int ablerda[]=new int[arrivalprob.length];
int bakerservice[]={3,4,5,6};
double bakerprob[]={0.35,0.25,0.20,0.20};
double cumbaker[]=new double[bakerprob.length];
int bakerrda[]=new int[arrivalprob.length];
int randomarrival[]=new int[60/ableservice[0]];
int randomservice[]=new int[60/ableservice[0]];
int arrival[]=new int[60/ableservice[0]];
int service[]=new int[60/ableservice[0]];
int interarrival[]=new int[60/ableservice[0]];
int serviceable[]=new int[60/ableservice[0]];
int servicebaker[]=new int[60/ableservice[0]];
int ablestart[]=new int[60/ableservice[0]];
int bakerstart[]=new int[60/ableservice[0]];
int ableend[]=new int[60/ableservice[0]];
int bakerend[]=new int[60/ableservice[0]];
int ableprocess[]=new int [60/ableservice[0]];
int bakerprocess[]=new int[60/ableservice[0]];
int qtime[]=new int[60/ableservice[0]];
int ttime[]=new int[60/ableservice[0]];
int tempable=0,tempbaker=0;
float ableavgser=0,bakeravgser=0,waitingcust=0,ttq=0,tts=0;
for(i=0;i<cumarrival.length;i++)
{    if(i==0)
{    cumarrival[i]=arrivalprob[i];
arrivalrda[i]=(int)(cumarrival[i]*100d);
}

else
{    cumarrival[i]=cumarrival[i-1]+arrivalprob[i];
arrivalrda[i]=(int)(cumarrival[i]*100d);
}
}
for(i=0;i <cumable.length;i++)
{    if(i==0)
{    cumable[i]=ableprob[i];
ablerda[i]=(int)(cumable[i]*100d);
}
else
{    cumable[i]=cumable[i-1]+ableprob[i];
ablerda[i]=(int)(cumable[i]*100d);
}
}
for(i=0;i<cumbaker.length;i++)
{    if(i==0)
{    cumbaker[i]=bakerprob[i];
bakerrda[i]=(int)(cumbaker[i]*100d);
}
else
{    cumbaker[i]=cumbaker[i-1]+bakerprob[i];
bakerrda[i]=(int)(cumbaker[i]*100d);
}
}
randomservice[0]=(int)(Math.random()*100d);
for(i=1;i<(60/ableservice[0]);i++)
{    randomarrival[i]=(int)(Math.random()*100d);
randomservice[i]=(int)(Math.random()*100d);
}
for(i=1;i<(60/ableservice[0]);i++)
{    for(j=0;j<arrivalrda.length;j++)
{    if(randomarrival[i]==0)
{    arrival[i]=arrivaltime[arrivaltime.length-1];
break;
}
if(randomarrival[i]<=arrivalrda[j])
{    arrival[i]=arrivaltime[j];
break;
}
}
interarrival[i]=interarrival[i-1]+arrival[i];
}
for(i=0;i<(60/ableservice[0]);i++)
{    for(j=0;j<ablerda.length;j++)
{    if(randomservice[i]==0)
{    serviceable[i]=ableservice[ableservice.length-1];
break;
}
if(randomservice[i]<=ablerda[j])
{    serviceable[i]=ableservice[j];
break;
}
}
for(j=0;j<bakerrda.length;j++)
{    if(randomservice[i]==0)
{    servicebaker[i]=bakerservice[bakerservice.length-1];
break;
}
if(randomservice[i]<=bakerrda[j])
{    servicebaker[i]=bakerservice[j];
break;
}
}

}
for(i=0;i<(60/ableservice[0]);i++)
{    if(tempable<=interarrival[i])
{    ablestart[i]=interarrival[i];
ableend[i]=ablestart[i]+serviceable[i];
ableprocess[i]=serviceable[i];
tempable=ableend[i];
ttime[i]=ableprocess[i]+qtime[i];
}
else if(tempbaker<=interarrival[i])
{    bakerstart[i]=interarrival[i];
bakerend[i]=bakerstart[i]+servicebaker[i];
bakerprocess[i]=servicebaker[i];
tempbaker=bakerend[i];
ttime[i]=bakerprocess[i]+qtime[i];
}
else if(interarrival[i]> tempable)
{    ablestart[i]=tempable;
ableend[i]=ablestart[i]+serviceable[i];
ableprocess[i]=serviceable[i];
qtime[i]=tempable-interarrival[i];
tempable=ableend[i];
ttime[i]=ableprocess[i]+qtime[i];
waitingcust++;
}
else
{    bakerstart[i]=tempbaker;
bakerend[i]=bakerstart[i]+servicebaker[i];
bakerprocess[i]=servicebaker[i];
qtime[i]=tempbaker-interarrival[i];
tempbaker=bakerend[i];
ttime[i]=bakerprocess[i]+qtime[i];
waitingcust++;
}
}
for(i=0;(interarrival[i]<=60)&&(i<(60/ableservice[0]));i++)
{    ableavgser=ableavgser+ableprocess[i];
bakeravgser=bakeravgser+bakerprocess[i];
ttq=ttq+qtime[i];
tts=tts+ttime[i];
}
float totalcust=i;
System.out.println("No.\tRDA.\tARR.\tIARR.\tRDS.\tASTAT.\tAPRO.\tAEND.\tBSTAT.\tBPRO.\tBEND.\tTSQ.\tTIS");
System.out.println("-------------------------------------------------------------------------------------------------------");
for(i=0;(interarrival[i]<=60)&&(i<(60/ableservice[0]));i++)
{    System.out.println((i+1)+"\t"+randomarrival[i]+"\t"+arrival[i]+"\t"+interarrival[i]+"\t"+randomservice[i]+"\t"+ablestart[i]+"\t"+ableprocess[i]+"\t"+ableend[i]+"\t"+bakerstart[i]+"\t"+bakerprocess[i]+"\t"+bakerend[i]+"\t"+qtime[i]+"\t"+ttime[i]);
System.out.println("-------------------------------------------------------------------------------------------------------");
}
System.out.println("PERFORMANCE OF THE SYSTEM IS AS FOLLOWS:");
System.out.println("AVERAGE SERVICE TIME OF ABLE:"+(ableavgser/totalcust));
System.out.println("AVERAGE SERVICE TIME OF BAKER:"+(bakeravgser/totalcust));
if(waitingcust>0)
System.out.println("AVERAGE WAITING TIME OF THE CUSTOMER IS:"+(ttq/waitingcust));
System.out.println("PROBABILITY OF WAITING IS:"+(waitingcust/totalcust));
System.out.println("AVERAGE TIME SPENT BY CUSTOMER IN THE SYSTEM IS:"+(tts/totalcust));

}
}

nmnmm

java

public class HelloWorld{

     public static void main(String []args){
        System.out.println("Hello World");
     }
}

Compile and Execute Java Online

java

public class FinalReverseWithoutUsingStringMethod{
    
    

     public static void main(String []args){
         String str = "PAWAN";
         StringBuilder str2 = new StringBuilder();
         str2.append(str);
         str2=str2.reverse();
         System.out.println(str2);
        
     }
}

Compile and Execute Java Online

java

public class HelloWorld{

     public static void main(String []args){
        System.out.println("Hello World");
     }
}

X64mb

java

public class HelloWorld{

     public static void main(String []args){
        System.out.println(2000000000l + 2000000000l);
     }
}

dmitryCalcTest1

java

import java.util.Scanner;

public class Main {

    public static void main(String[] args) throws Exception {

        calcVer1("5+14");
    }

    private static void calcVer1(String input) throws Exception {
 

        Float number1 = 0F;
        String action = null;
        Float number2 = 0F;

        int dexaPart1 = 0;
        int dexaPart2 = 0;
        boolean isDotExsist = false;

        for (char symbol : input.toCharArray()) {

            if (symbol == '.') {
                isDotExsist = true;
            } else if (symbol == '/'
                    || symbol == '+'
                    || symbol == '-'
                    || symbol == '*') {
                action = String.valueOf(symbol);
                isDotExsist = false;
            } else if (Character.isDigit(symbol)) {
                Float digit = Float.valueOf(String.valueOf(symbol));
                if (action == null) {
                    if (isDotExsist) {
                        dexaPart1 = (int) (dexaPart1 * 10 + digit);

                    } else {
                        number1 = number1 * 10 + digit;
                    }
                } else {
                    if (isDotExsist) {
                        dexaPart2 = (int) (dexaPart2 * 10 + digit);

                    } else {
                        number2 = number2 * 10 + digit;
                    }
                }
            } else {
                throw new Exception("Не получилось");
            }
        }

        number1 = number1 + (float) (dexaPart1 / (Math.pow(10, String.valueOf(dexaPart1).length())));
        number2 = number2 + (float) (dexaPart2 / (Math.pow(10, String.valueOf(dexaPart2).length())));


        float result;
        switch (action) {
            case "+":
                result = number1 + number2;
                break;
            case "-":
                result = number1 - number2;
                break;
            case "*":
                result = number1 * number2;
                break;
            case "/":
                result = number1 / number2;
                break;
            default:
                System.out.println("Я пока не умею такую команду: " + action);
                return;
        }


        System.out.println(number1 + action + number2 + "=" + result);
    }


    private static void calcVer2() throws Exception {
        Scanner consoleReader = new Scanner(System.in);
        String input = consoleReader.next();

        Float number1 = 0F;
        String action = null;
        Float number2 = 0F;

        String buffer = "";
        for (char symbol : input.toCharArray()) {
            if (Character.isDigit(symbol) || symbol == '.') {
                buffer = buffer + symbol;
            } else if (symbol == '/'
                    || symbol == '+'
                    || symbol == '-'
                    || symbol == '*') {
                action = String.valueOf(symbol);
                number1 = Float.valueOf(buffer);
                buffer = "";
            } else {
                throw new Exception("Не получилось");
            }
        }

        number2 = Float.valueOf(buffer);

        float result;
        switch (action) {
            case "+":
                result = number1 + number2;
                break;
            case "-":
                result = number1 - number2;
                break;
            case "*":
                result = number1 * number2;
                break;
            case "/":
                result = number1 / number2;
                break;
            default:
                System.out.println("Я пока не умею такую команду: " + action);
                return;
        }


        System.out.println(number1 + action + number2 + "=" + result);
    }
}

Compile and Execute Java Online

java

public class HelloWorld
{

 public static void main(String []args)
 {
     


 for(int i=4; i>0; i--)//n=4
  {
     
   for(int j=0; j<=i; j++)
 
   {
   
     if(j<i)
   
     {
 
        System.out.print("_ ");

     }

     else
     {

        System.out.print(""+i);
 
     }
 
    }
 
     if(i<4)
    {
  
   for(int l=i; l<7-i; l++) //7-i=>(2n-1)-i           
      {
            
        System.out.print(" _");

       }

           System.out.print(" "+i);

        }
 
        for(int k=i; k>0; k--)

            {

             System.out.print(" _");
 
            }

            System.out.print("\n");
            
            if(i==1)
            {
                for(int a=i+1; a<=4; a++)//a=2
                {
                    for(int b=0; b<=a; b++) 
                 {
                      if(b<a)
   
                     {
 
                        System.out.print("_ ");

                     }

                      else
                     {

                        System.out.print(""+a);
 
                     }
 
                  }
                  System.out.print("\n");
                    
                 }
                
            }
            

      }
        

         
     }
}

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