Java xor operator with example programs

Posted by: Instanceofjava Posted date: May 06, 2017 / comment : 0


Java Bitwise XOR operator:

In Java, you can use the ^ operator to perform a bitwise exclusive or (XOR) operation on two integers. The XOR operation compares each bit of the first number to the corresponding bit of the second number. If the bits are the same, the corresponding result bit is set to 0.  
The matching result bit is set to 1 if the bits vary.
Here's an example:

int a = 12; // binary: 1100
int b = 25; // binary: 11001
int result = a ^ b;
System.out.println("Result of XOR operation: " + result);

In this example, the XOR operation compares the bits of the integers a and b. Since the bits at positions 2 and 3 are different, the corresponding result bits are set to 1. Therefore the binary representation of result is 01101 which decimal representation is 13
This will output:

Result of XOR operation: 13

It's important to note that XOR operation is not only limited to integers. You can also perform it on bytes or even on bytes of an array, by applying the operation on each element of array.


byte[] array1 = {0, 1, 2, 3, 4, 5};
byte[] array2 = {5, 4, 3, 2, 1, 0};
byte[] result = new byte[6];

for (int i = 0; i < 6; i++) {
    result[i] = (byte) (array1[i] ^ array2[i]);
}

It's also useful for some cryptographic algorithms for example the One Time Pad encryption, where the XOR operation is used to encrypt and decrypt the data.
  • Java bit wise Xor operator operates on bits of numbers.
  • It will be represented as "^".
  • XOR will return true if  both bits are different.
  •  For example 1 XOR 0 gives 1. Ex: 1^0=1.
  • 0^1=1.




 Java Bitwise Xor:

Java bitwise XOR operator


Program#1:Java Example program on two integer numbers Xor operation.


  1. package com.Xorinjava;
  2. public class XOR {
  3.     /**
  4.     * Xor in java Xor example program
  5.     * @author www.instanceofjava.com
  6.     */
  7.     public static void main(String[] args) {
  8.         int a=1;
  9.         int b=0;
  10.         int c= a^b;
  11.         
  12.         System.out.println(c);
  13.  
  14.     }
  15.  
  16. }
Output:

  1. 1

Program #2: java xor boolean expression : java example program


  1. package com.Xorinjava;
  2.  
  3. public class XOR {
  4.     /**
  5.     * Xor in java boolean Xor example program
  6.     * @author www.instanceofjava.com
  7.     */
  8. public static void main(String[] args) {
  9.         boolean a=true;
  10.         boolean b=false;
  11.         boolean c= a^b;
  12.         
  13.         System.out.println(c);
  14.         
  15.         System.out.println(false^false);
  16.         System.out.println(true^true);
  17.  
  18.     }
  19.  
  20. }

Output:


  1. true
  2. false
  3. false
Program #3: java xor boolean expression and integer : java example program Using Eclipse IDE.

java Xor operator

Java Xor Strings:

  • Gives compile time error.
  • The operator ^ is undefined for the argument type(s) java.lang.String, java.lang.String

Program #4: Java Xor of two strings


  1. package com.Xorinjava;
  2. public class XOR {
  3.     /**
  4.     * Xor in java boolean Xor example program
  5.     * @author www.instanceofjava.com
  6.     */
  7.     public static void main(String[] args) {
  8.         String str="a";
  9.         String str1="b";
  10.         System.out.println(str^str1);// compile time error: The operator ^ is undefined for the
  11. argument type(s) java.lang.String, java.lang.String
  12.  
  13.     }
  14.  
  15. }


 Xor of Binary Strings:

Program #5: Java xor of two binary strings.


  1. package com.Xorinjava;
  2. public class XOR {
  3.     /**
  4.     * Xor in java String bits Xor example program
  5.     * @author www.instanceofjava.com
  6.     */
  7.     public static void main(String[] args) {
  8.         String str1="1010100101";
  9.         String str2="1110000101";
  10.         StringBuffer sb=new StringBuffer();
  11.         
  12.         for (int i = 0; i < str1.length(); i++) {
  13.             
  14.             sb.append(str1.charAt(i)^str2.charAt(i));
  15.             
  16.         }
  17.        System.out.println(sb);
  18.     }
  19.  
  20. }
Output:


  1. 0100100000

How to get first two characters of a string in java

Posted by: Instanceofjava Posted date: May 06, 2017 / comment : 2

  • We can get first  two character of a string in java by using subString() method in java
  • To get first N numbers of a string s.substring(0,n);
  • Lets see an example java program on how to get first two characters or first N characters.
In Java, you can use the charAt() method to get the first character of a string. The charAt() method takes an index as a parameter and returns the character at that index. 
To get the first character of a string, you can pass in the index 0 to the charAt() method.

Here's an example:


String str = "Hello, World!";
char firstChar = str.charAt(0);
System.out.println("First character: " + firstChar);

This will output:
First character: H



Program #1: Java Program to get first two characters of a String.



  1.  package StringInterviewprograms;
  2.  
  3. public class GetFirstTwoCharacters {
  4.  
  5. /**
  6. * How to get First N characters in java 
  7. * @author www.instanceofjava.com
  8. */
  9.  
  10. public static void main(String[] args) {
  11.         
  12.         String str="Get first two characters of a String";
  13.         
  14.         System.out.println(str.substring(0,2));
  15. }
  16.     
  17.     
  18. }
     
Output:

  1.  Ge

  Program #2:


  1. package StringInterviewprograms;
  2. import java.util.Scanner;
  3.  
  4. public class GetFirstTwoCharacters {
  5. /**
  6. * How to get First N characters in java 
  7. * @author www.instanceofjava.com
  8. */
  9. public static void main(String[] args) {
  10.         
  11.          Scanner sc= new Scanner(System.in);
  12.          
  13.          System.out.println("Please Enter a String");
  14.          
  15.          String str=sc.next();         
  16.         if(str.length()>=2){
  17.  
  18.             System.out.println(str.substring(0,2));
  19.         }else{
  20.             System.out.println("please enter a string with minimum length of 2.");
  21.         }
  22.         }
  23.  
  24.   }

 Output:


  1. Please Enter a String
  2. miss you
  3. mi


Get First Two characters String Java

How to check if a character is a special character in java

Posted by: Instanceofjava Posted date: May 06, 2017 / comment : 0

  • To check if string contains special character or not or  check whether first character is special character or not we can use regex or contains method of sting class.
  • By using  java.util.regex.Matcher class and java.util.regex.Pattern class methods we can check whether string has special character or not
  • Lets see an example program on how to check a string has special character or not using java regex.



Program #1: Java example program to check string has special character or not using  java regex's?
 
  1. package StringInterviewprograms;
  2. import java.util.regex.Matcher;
  3. import java.util.regex.Pattern;
  4.  
  5. public class CheckSpecialCharacterString {
  6.  
  7.     /**
  8.      * Check whether the String contains special character or not using java
  9.      * @author www.instanceofjava.com
  10.      */
  11.     
  12. public static void main(String[] args) {
  13.  
  14. String Str="Java String interview questions ";
  15. String Str1="Java String interview questions % ";
  16. Pattern p = Pattern.compile("[^a-z0-9 ]", Pattern.CASE_INSENSITIVE);
  17. Matcher m = p.matcher(Str);
  18. boolean check = m.find();
  19.  
  20. if (check)
  21.    System.out.println("String: "+Str+" contains special character");
  22. else
  23.    System.out.println("String: "+Str+" does not contains any special character");
  24.  
  25. Matcher m1= p.matcher(Str1);
  26.  
  27. boolean flag = m1.find();
  28.  
  29. if(flag)
  30.        System.out.println("String: "+Str1+" contains special character");
  31.     else
  32.        System.out.println("String: "+Str1+" does not contains any special character");
  33.  
  34.    }
  35. }
Output:

  1. String: Java String interview questions  does not contains any special character
  2. String: Java String interview questions %  contains special character

  • We can check each character of a string is special character or not without using java regex's.
  • By using String class contains method and for loop we can check each character of a sting is special character or not.
  • Let us see a java example program on how to check each character (including space) of a string is special character or not.
  • String validation for special characters.


Program #2: Java example program to check each character of string is special character or not without using  java regex's?

  1. package StringInterviewprograms;
  2.  
  3. import java.util.regex.Matcher;
  4. import java.util.regex.Pattern;
  5.  
  6. public class CheckSpecialCharacterString {
  7.  
  8.     /**
  9.      * Check whether the each character of String is special character or not using java
  10.      * @author www.instanceofjava.com
  11.      */
  12.     
  13. public static void main(String[] args) {
  14. String Str="Java String interview questions*$%";
  15.   
  16. String specialCharacters=" !#$%&'()*+,-./:;<=>?@[]^_`{|}";
  17.  
  18. for (int i = 0; i < Str.length(); i++) {
  19.     
  20.     if (specialCharacters.contains(Character.toString(Str.charAt(i))))
  21.     {
  22.        
  23.         System.out.println(Str.charAt(i)+": is a special character");
  24.     }  
  25.   }
  26.  
  27. }
  28.  
  29. }

Output:


  1.  : is a special character
  2.  : is a special character
  3.  : is a special character
  4. *: is a special character
  5. $: is a special character
  6. %: is a special character

Program #3: Java example program to check each character of string is special character or not without using  java regex's Using Eclipse IDE.


Check Special Character String java

How to check if first character of a string is a number or not in java

Posted by: Unknown Posted date: May 06, 2017 / comment : 0

  • To check if first character of a string is a number or not in java we can check in multiple ways.
  • By using Character.isDigit() method by passing character of string using for loop or substring method.
  • Other way is to check str.substring(0, 1).matches("[0-9]").
  • Lets see an example program in java to check first character of a string is digit or character. 



Program #1: Java example program to check the each character of string is number or not   character is a letter or number in Java without using regexes?

  1. package StringInterviewprograms;
  2. /**
  3.  * Check whether the given character is a number /digit or not by using java character isdigit
  4.  *method
  5.  * @author www.instanceofjava.com
  6.  */
  7. public class CheckEachCharacterNumberOrNot {
  8.     public static void main(String[] args) {
  9.         String str = "instanceofjava37";
  10.  
  11.         //Check whether the given character is a number /digit or not ?
  12.  
  13.         for(int i=0; i<str.length();i++)
  14.         {
  15.             Boolean flag = Character.isDigit(str.charAt(i));
  16.  
  17.             if(flag){
  18.  
  19.                System.out.println("'"+str.charAt(i)+"' is a number");
  20.             }
  21.             else{
  22.                System.out.println("'"+str.charAt(i)+"' is not a number");
  23.             }
  24.  
  25.         }
  26.         
  27. }
  28.  
  29. }

Output:

  1. 'i' is not a number
  2. 'n' is not a number
  3. 's' is not a number
  4. 't' is not a number
  5. 'a' is not a number
  6. 'n' is not a number
  7. 'c' is not a number
  8. 'e' is not a number
  9. 'o' is not a number
  10. 'f' is not a number
  11. 'j' is not a number
  12. 'a' is not a number
  13. 'v' is not a number
  14. 'a' is not a number
  15. '3' is a number
  16. '7' is a number
     
Program #2: Java example program to check the First character of string is number or not by using regex.

  1. package StringInterviewprograms;
  2. /**
  3.  * Check whether the given character is a number /digit or not
  4.  * @author www.instanceofjava.com
  5.  */
  6. public class CheckFirstCharacterNumberOrNot {
  7.  
  8.     public static void main(String[] args) {
  9.         String str = "instanceofjava37";
  10.  
  11.           Boolean flag1 = str.substring(0, 1).matches("[0-9]");
  12.  
  13. if(flag1){
  14.  
  15.  System.out.println("First Character is a number..!");
  16.  
  17.  }
  18.  else{
  19.    System.out.println("First character is not a number..!");
  20. }
  21. }
  22.  
  23. }

Output:

  1. First character is not a number..!


Program #3: Java example program to check the First character of string is number or not using eclipse IDE.


Check first character string number digit java

Java program to Get current date and time

Posted by: Instanceofjava Posted date: April 23, 2017 / comment : 0

  • By using date and calendar classes we can get current date and time in java.
  • By using SimpleDateFormat we can convert date into string format.
  • Create object of date.
  • Create object of SimpleDateFormat by passing required format to constructor
  • Format using object of SimpleDateFormat 




Using Date Object:


Java Program to get current date and time using Date object and SimpleDateFormat


  1. import java.text.DateFormat;
  2. import java.text.SimpleDateFormat;
  3. import java.util.Date;
  5.  
  6. public class GetDateTime {
  7.  
  8.     /**
  9.      * Get current date and time in java
  10.      * @author www.instanceofjava.com
  11.      */
  12.     public static void main(String[] args) {
  13.         
  14.         
  15.         DateFormat df = new SimpleDateFormat("dd-MM-yyyy HH:mm:ss");
  16.         Date date = new Date();
  17.         System.out.println(df.format(date));
  18.  
  19. }
  20. }

Output:


  1. 23-04-2017 19:43:23
Using Calendar Object:

Java Program to get current date and time using Calendar object and SimpleDateFormat


  1. import java.text.DateFormat;
  2. import java.text.SimpleDateFormat;
  3. import java.util.Calendar;
  5.  
  6. public class GetDateTime {
  7.  
  8.     /**
  9.      * Get current date and time in java
  10.      * @author www.instanceofjava.com
  11.      */
  12.  public static void main(String[] args) {
  13.         
  14.         
  15.         DateFormat df = new SimpleDateFormat("dd-MM-yyyy HH:mm:ss");
  16.         Calendar calendarobj = Calendar.getInstance();
  17.         System.out.println(df.format(calendarobj.getTime()));
  18.  }
  19.  
  20. }

Output:


  1. 23-04-2017 19:47:45
Java Program to get current date and time in mill seconds


get current date and time java

Java program to find maximum of two numbers using Math.max()

Posted by: Instanceofjava Posted date: April 23, 2017 / comment : 0

  • We can find maximum of two numbers by using if condition check.
  • In java.lang.Math class also having a method Math.max() which will take two numbers and returns maximum number.
  • We have separate methods for int , float , double and long.




  1.  public static double max(double a, double b)

Java program to find maximum of two double values using Math.max() method.


  1. package com.mathmax;
  2. public class MathMAx {
  3.     
  4.     /**
  5.      * Math.max() method in java
  6.      * @author www.instanceofjava.com
  7.      */
  8.  
  9.   public static void main(String[] args) {
  10.         
  11.         
  12.         double a = 234567;
  13.         double b =234557;
  14.      
  15.         double x = 764554;
  16.         double y =764464;
  17.         
  18.         System.out.println("Math.max(" + a + "," + b + ")=" + Math.max(a, b));
  19.         System.out.println("Math.max(" + x + "," + y + ")=" + Math.max(x, y));
  20.         
  21.     }
  22.  
  23. }
Output:

  1. Math.pow(3.0,4.0)=81.0
  2. Math.pow(4.0,3.0)=64.0
  3. Math.pow(4,2)=16.0

Java program to find maximum of two float values using Math.max() method.



math.max method in java float


Java program to find maximum of two int values using Math.max() method.
 
  1. package com.mathmax;
  2. public class MathMAx {
  3.     
  4.     /**
  5.      * Math.max() method in java
  6.      * @author www.instanceofjava.com
  7.      */
  8.  
  9. public static void main(String[] args) {
  10.         
  11.         System.out.println( Math.max(1, 1));
  12.         System.out.println( Math.max(1, 2));
  13.         System.out.println(Math.max(1.222f, 1.223f));
  14.         System.out.println(Math.max(1.222, 1.223));
  15.         
  16.     }
  17.  
  18. }

Output:

  1. 1
  2. 2
  3. 1.223
  4. 1.223

Find power using math.pow() in java

Posted by: Instanceofjava Posted date: April 23, 2017 / comment : 0

  • java.lang.Math.pow() method used to find the power of numbers.
  • It is a static method define in Math class so that we can call directly using classname.
  • Math.pow();
  • It takes two double arguments and return type is double.

  1. public final class Math extends Object
  1. public static double pow(double a, double b)



Java Program to explain the usage of Math.pow() method in java

  1. public class MathPow {
  2.  
  3.     /**
  4.      * Math.pow() method in java
  5.      * @author www.instanceofjava.com
  6.      */
  7. public static void main(String[] args) {
  8.     
  9.     
  10.     double a = 3.0;
  11.     double b = 4.0;
  12.  
  13.     
  14.     System.out.println("Math.pow(" + a + "," + b + ")=" + Math.pow(a, b));
  15.     System.out.println("Math.pow(" + b + "," + a + ")=" + Math.pow(b, a));
  16.    
  17.     System.out.println("Math.pow(4,2)="+Math.pow(4,2));
  18. }
  19.  
  20. }

Output:


  1. Math.pow(3.0,4.0)=81.0
  2. Math.pow(4.0,3.0)=64.0
  3. Math.pow(4,2)=16.0
math pow method in java
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