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Print Array Size in Java

java 

import java.util.*;

public class HelloWorld{

    public static void test(final List<Integer> ints) {
        ints.add(5);
    }

    public static void main(final String[] arguments) {
        final List<Integer> ints = new ArrayList<>();
        test(ints);
        
        System.out.println(ints.size());
    }
}

Multiplication Operation in Java

java 

public class HelloWorld{

     public static void main(String []args){
      double u, i, r;
    i = 10; // ток Ампер
    r = 200; // сопротивление Ом
     u = i*r; // формула нахождения напряжения на конце проводника Вольт
    
     System.out.println("Напряжение = " + (u) + " Вольт");
     }
}

WeatherReport Program using Java

java 

import java.util.Random;
class WeatherReport {
    private int temperature;
    private int windSpeed;
    private String windDirection;
    private static int weatherReportStationNumber = 0;
    
    public WeatherReport(int temperature, int windSpeed, String windDirection){
        
        this.temperature = temperature;
        this.windSpeed = windSpeed;
        this.windDirection = windDirection;
        
    }
    
    public void setTemperature(int temperature)
    {
        this.temperature = temperature;
    }
    
    public int getTemperature()
    {
        return temperature;
    }
    
    public void setWindSpeed(int windSpeed){
        this.windSpeed = windSpeed;
    }
    
    public int getWindSpeed(){
        
        return windSpeed;
    }
    
    public void setWindDirection()
    {
        
        Random x = new Random();
        int check = x.nextInt(4);
        
        switch(check){
            
            case 0:
                this.windDirection = "NORTH";
                break;
            case 1:
                this.windDirection = "EAST";
                break;
            case 2:
                this.windDirection = "WEST";
                break;
            case 3:
                this.windDirection = "SOUTH";
                break;
            }
        }
        
    
    public String getWindDirection()
    {
        return windDirection;
    }
    
    public String methodOne(int temperature, int windSpeed, String windDirection){
        
        String dressCode = "";
        int product = temperature + windSpeed;
        
        if(windDirection == "NORTH" && temperature <= -20){
        
            if(temperature< -20){
                dressCode = "stay inside";
            }    
        }
        else    {
            if(product<=0)
                dressCode = "winter coat";
            else if(product<=15)
                dressCode = "light coat";
            else if(product>15)
                dressCode = "shorts";
        }
            
        return dressCode;    
        
    }

    public static void randomWeatherReportStationVariable(){
        
        Random x = new Random();
        int assignment = x.nextInt(51) + 100;
        weatherReportStationNumber = assignment;
        System.out.println(assignment);
        
    }
    
    public String methodTwo(String name)
    {
        
        String interleavedString = "";
        if(name.length() == windDirection.length())
        {
         for(int x = 0; x<name.length();x++){
          
          interleavedString += name.charAt(x);
          interleavedString += windDirection.charAt(x);
             
         }
         
        }
        
        else{
          
         interleavedString = "ERROR"; 
            
        }
        
        return interleavedString;
    }
    
    public int methodThree(int factor){
        
        int windFactor = 0;
        windFactor = windSpeed/factor;
        return windFactor;
        
    }

}


public class WeatherReportTestHarness{
    
    public static void main(String []args){
        
        WeatherReport[][] testArray = new WeatherReport[7][3];
        
        //randomWeatherReportStationVariable();
        int z = 0;
        for(int x = 0;x<3;x++){
            
            for(int i = 0;i<7;i++){
                
                z += 2;
                testArray[i][x] = new WeatherReport((-24 + z), (0 + z), "");
                testArray[i][x].setWindDirection();
            }
        }
        
        for(int x = 0;x<3;x++){
            for(int i = 0;i<7;i++){
                
             System.out.println("Temperature at index " + i + x + " is " + testArray[i][x].getTemperature());
             System.out.println("----------------------------------");
             System.out.println("Wind Speed at index " + i + x + " is " + testArray[i][x].getWindSpeed());
             System.out.println("----------------------------------");
             System.out.println("Wind Direction at index " + i + x + " is " + testArray[i][x].getWindDirection());
             System.out.println("----------------------------------");
             System.out.println("Dress Code at index " + i + x + " is " + testArray[i][x].methodOne(testArray[i][x].getTemperature(), testArray[i][x].getWindSpeed(), testArray[i][x].getWindDirection()));
             //System.out.println("----------------------------------");
             //System.out.println("The Weather Report Station Number is " + weatherReportStationNumber);
             System.out.println("----------------------------------");
             System.out.println(testArray[i][x].methodTwo("HELLO"));
             System.out.println("----------------------------------");
             if(testArray[i][x].getWindDirection().contains("TH") == true){
                System.out.println("index " + i + x + "contains th");
                System.out.println("Temperature at index " + i + x + " is " + testArray[i][x].getTemperature());
                System.out.println("----------------------------------");
                System.out.println("Wind Speed at index " + i + x + " is " + testArray[i][x].getWindSpeed());
                System.out.println("----------------------------------");
                System.out.println("Wind Direction at index " + i + x + " is " + testArray[i][x].getWindDirection());
                System.out.println("----------------------------------");
             }
            }
        }


        
    }
    
}

Split a string using Java

java 

import java.util.regex.*;
public class PatternMatch {
    public static void main(String args[]) {
       int count=0;
       //Pattern p=Pattern.compile("\\s");
       //Pattern p=Pattern.compile("o");
       // Pattern p=Pattern.compile("\\.");
        Pattern p=Pattern.compile("[.]");
       // String s[]=p.split("Infosys Software Solution");
       String s[]=p.split("WWW.Infosys.COM");
         for(String s1:s)
         {
             System.out.println(s1);
         }
    }
}

Checking Mobile Number Validity using Java

java 

import java.util.regex.*;
public class Main {
    public static boolean isValid(String s)
    {
        Pattern p=Pattern.compile("(0|\\+91[\\s])?[7-9][0-9]{9}");
        Matcher m=p.matcher(s);
        return (m.find() && m.group().equals(s));
    }
    public static void main(String args[]) {
       String str="+91 9415074505";
        if(isValid(str))
        {
            System.out.println("It is a valid mobile number");
        }
        else
        {
            System.out.println("It is invalid mobile number");
        }  
    }
}

Simple PatternMatch Program in Java

java 

import java.util.regex.*;
//import java.util.Scanner;
public class PatternMatch {
    public static void main(String args[]) {
      // Scanner sc=new Scanner(System.in);
     //  System.out.println("Enter the Pattern String");
    //   String ptr=sc.nextLine();
    //   System.out.println("Enter the Target String");
    //  String tar=sc.nextLine();
       int count=0;
       //Pattern p=Pattern.compile("[ab]");
      // Pattern p=Pattern.compile("[^ab]");
      // Pattern p=Pattern.compile("[a-z]");
     // Pattern p=Pattern.compile("[^a-z]");
    // Pattern p=Pattern.compile("[A-Z]");
       // Pattern p=Pattern.compile("[a-zA-Z0-9]");
        Pattern p=Pattern.compile("[^a-zA-Z0-9]");
        Matcher m=p.matcher("a7b@z#9");
        while(m.find())
        {
            count++;
            //int endData=m.end();
           // endData-=1;
            System.out.println(m.start()+"....."+m.group());
        }

        System.out.println("The total number of occurences is "+count);
    }
}

BlackJack

java 

//(c) A+ Computer Science
//www.apluscompsci.com
//Name - Bryan Nieto

import static java.lang.System.*;

public class CardRunner
{
	public static void main( String args[] )
	{
		Card one = new Card("SPADES", 9);
		out.println(one.getSuit());
		out.println(one.getFace());

		Card two = new Card("DIAMONDS", 1);
		out.println(two);
		two.setFace(3);
		out.println(two);

		Card three = new Card("CLUBS", 4);
		out.println(three);

		Card four = new BlackJackCard("SPADES", 1);
		out.println(four);

		Card five = new BlackJackCard("HEARTS", 13);
		out.println(five);
		
		Card six = new BlackJackCard("HEARTS", 11);
		out.println(six);
		
		Card seven = new BlackJackCard("CLUBS", 12);
		out.println(seven);	
	}
}


class Card
{
	public static final String FACES[] = {"ZERO","ACE","TWO","THREE","FOUR",
			"FIVE","SIX","SEVEN","EIGHT","NINE","TEN","JACK","QUEEN","KING"};

	//instance variables
	private String suit;
	private int face;

  	//constructors
    public Card( String s, int f)
    {
        suit = s;
        face = f;
    }

	// modifiers
	public void setFace( int f)
	{
	    face = f;
	}
	
	public void setSuit( String s)
	{
	    suit = s;
	}


  	//accessors
	public String getSuit()
	{
	    return suit;
	}
	
	public int getFace()
	{
	    return face;
	}
	
  	//toString
  	public String toString()
  	{
  	    return FACES[face] + " of " + suit;
  	}

 }
  
  
  class BlackJackCard extends Card //Card is superclass
  {
      //Create a constructor that recieves a suit and a face
      public BlackJackCard(String s,int f)
      {
          super(s, f ); //'super' refers to the Card superclass
      }
      //make a getValue() method that returns the worth of the card
      //based on the rules of BLackJack
public int getValue()
      {
          //create if statements for the conditions below
          //Ace is worth 11 for now
          if( getFace() == 1)
          return 11;
          //Jack, Queen, and King are all worth 10
          if( getFace() > 10)
          return 10;
          // all other cards are face value
        else 
        return getFace();
}
      
      //make a toString method
public String toString()
      {
         //return output example in lab
         return super.toString() + " " + getValue();
      }
  }

BlackJack

java 

//(c) A+ Computer Science
//www.apluscompsci.com
//Name - Zeanna Jeffries

import static java.lang.System.*;
import java.awt.Color;

public class CardRunner
{
	public static void main( String args[] )
	{

		Card one = new Card("SPADES", 9);
		out.println(one.getSuit());
		out.println(one.getFace());

		Card two = new Card("DIAMONDS", 1);
		out.println(two);
		two.setFace(3);
		out.println(two);

		Card three = new Card("CLUBS", 4);
		out.println(three);

		Card four = new Card("SPADES", 1);
		out.println(four);

		Card five = new Card("HEARTS", 13);
		out.println(five);
		
		Card six = new Card("HEARTS", 11);
		out.println(six);
		
		Card seven = new Card("CLUBS", 12);
		out.println(seven);
		
		

	}
}
class Card
{
	public static final String FACES[] = {"ZERO","ACE","TWO","THREE","FOUR",
			"FIVE","SIX","SEVEN","EIGHT","NINE","TEN","JACK","QUEEN","KING"};

	//instance variables
		private String suit;
		private int face;

  	//constructors
        public Card( String s, int f)
        {
            suit = s;
            face = f;
        }

	// modifiers
		public void setFace( int f)
		{
		    face = f;
		}
        public void setSuit( String s)
        {
            suit = s;
        }

  	//accessors
	    public String getSuit()
	    {
	        return suit;
	    }
        public int getFace()
        {
            return face;
        }
  	//toString
        public String toString()
        {
            return FACES[face] + " of " + suit; 
        }
}


class BlackJackCard extends Card
    {
    
    public BlackJackCard(String s, int f)
        {
        super(s, f);
        }
    
    public int getValue()
        {
        if (getFace()==1)
            return 11;
        if (getFace()>10)
            return 10;
        else
            return getFace();
        }
    
 
    public String toString()
        {
        return super.toString() + " " + getValue();
        }
    }

Check Palindrome String using Java

java 

import java.util.Scanner;
 
public class ChkPalindrome
{
   public static void main(String args[])
   {
      String str, rev = "";
      Scanner sc = new Scanner(System.in);
 
      System.out.println("Enter a string:");
      str = sc.nextLine();
 
      int length = str.length();
 
      for ( int i = length - 1; i >= 0; i-- )
         rev = rev + str.charAt(i);
 
      if (str.equals(rev))
         System.out.println(str+" is a palindrome");
      else
         System.out.println(str+" is not a palindrome");
 
   }
}

Sok

java 

import java.util.*;

public class Sok{
//static Scanner sc=new Scanner(System.in);

public static void main(String []args){
    int [] lista ={6,3,8,1,5};
    int index= -1;
    int varde=3;
    
    System.out.println("talet finns i listan"+ index);

for(int i = 0; i<lista.length;i++){
    if(lista[i] == varde)
    {
        index = i;
        break;
    }
    }
        //return index;


}
}

//bubbelsortering
/*public static void bubbleSort(double data[]) {
		
		for(int m = data.length-1; m > 0; m--) {
			
			for(int n = 0; n < m; n++) {
				
				if(data[n] > data[n+1]) {
					double temp = data[n];
					data[n] = data[n+1];
					data[n+1] = temp;
				}
			}
		}
	}


//https://www.youtube.com/watch?v=RqfWvIsYmsc



}*/

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