- Java Basic Programs
- Java Programming Examples
- Java Print Hello World
- Java Get Input from User
- Java Print Integer
- Java Add two Numbers
- Java Check Even or Odd
- Java Check Prime or Not
- Java Check Alphabet or Not
- Java Check Vowel or Not
- Check Reverse equal Original
- Java Fahrenheit to Celsius
- Java Celsius to Fahrenheit
- Java Perfect Number Program
- Java Find Quotient Remainder
- Java Days to Seconds
- Java Count Digits in Number
- Java Binary Number Addition
- Java Discount Program
- Java Compute Courier Charge
- Java Find Telephone Bill
- Java Print ASCII Values
- Java Check Palindrome or Not
- Java Check Armstrong or Not
- Generate Armstrong Numbers
- Add two Numbers using Pointers
- Java Mathematical Programs
- Add Subtract Multiply & Divide
- Java Make Calculator
- Java Add Digits of Number
- Java Check Leap Year or Not
- Java Check Divisibility
- Java Find Simple Interest
- Java Find Compound Interest
- Java Print Fibonacci Series
- Java Find nCr nPr
- Calculate Average & Percentage
- Java Calculate Arithmetic Mean
- Java Calculate Student Grade
- Java Print Table of Number
- Java Print Prime Numbers
- Java Add n Numbers
- Java Interchange two Numbers
- Java Reverse Numbers
- Java Swap two Numbers
- Count Positive Negative & Zero
- Find Largest of two Numbers
- Find Largest of three Numbers
- Java Find Factorial of Number
- Java Find HCF & LCM
- Area & Perimeter of Square
- Area & Perimeter of Rectangle
- Area & Circumference of Circle
- Java Conversion Programs
- Java Decimal to Binary
- Java Decimal to Octal
- Java Decimal to Hexadecimal
- Java Binary to Decimal
- Java Binary to Octal
- Java Binary to Hexadecimal
- Java Octal to Decimal
- Java Octal to Binary
- Java Octal to Hexadecimal
- Java Hexadecimal to Decimal
- Java Hexadecimal to Binary
- Java Hexadecimal to Octal
- Java Pattern Programs
- Java Pattern of Stars
- Java Pattern of Alphabets
- Java Pattern of Numbers
- Java Pyramid of Stars
- Java Pyramid of Alphabets
- Java Pyramid of Numbers
- Java Print Diamond Pattern
- Java Print Floyd Triangle
- Java Print Pascal Triangle
- Java Array Programs
- One Dimensional Array Program
- Java Linear Search
- Java Binary Search
- Find Largest Element in Array
- Find Smallest Element in Array
- Java Reverse Array
- Insert Element in Array
- Delete Element from Array
- Java Merge two Array
- Java Bubble Sort
- Java Selection Sort
- Java Insertion Sort
- Java Find Common Elements
- Java Count Even/Odd Number
- Two Dimensional Array Program
- Java Add two Matrices
- Java Subtract two Matrices
- Java Transpose Matrix
- Multiply two Matrices
- Three Dimension Array Program
- Java String Programs
- Java Print String
- Find Length of String
- Java Compare two String
- Java Copy String
- Java Concatenate String
- Java Reverse String
- Delete Vowels from String
- Delete Words from Sentence
- Find Occurrence of a Character
- Java Find Occurrence of a Word
- Occurrence of Each Character
- Java Occurrence of Each Word
- Java Count Repeated Characters
- Java Count Repeated Words
- Java Capitalize Each Word
- Java Count Vowels/Consonants
- Java Extract Numbers
- Java Count Word in String
- Remove Spaces from String
- Java Sort a String
- Java Uppercase to Lowercase
- Java Lowercase to Uppercase
- Java Swap two Strings
- Java Check Anagram or Not
- Java Check Balance Parentheses
- Java Check Password Strength
- Java File Programs
- Java Read File
- Java Write to File
- Read & Display File Content
- Java Copy File
- Java Append Text to File
- Java Merge two File
- List files in Directory
- Java Delete File
- Java Miscellaneous Programs
- Generate Random Numbers
- Java Print Time & Date
- Java Get IP Address
- Java Shutdown Computer
- Java Programming Tutorial
- Java Tutorial
Java Program to Swap Two Numbers
This article covers a program in Java that swaps two numbers entered by user at run-time of the program.
Swap Two Numbers using Third Variable in Java
The question is, write a Java program to swap any two given numbers. The number must be received by user at run-time. The program given below is its answer:
import java.util.Scanner; public class fresherearth { public static void main(String[] args) { int a, b, temp; Scanner s = new Scanner(System.in); System.out.print("Enter the First Number: "); a = s.nextInt(); System.out.print("Enter the Second Number: "); b = s.nextInt(); temp = a; a = b; b = temp; System.out.println("\na = " +a); System.out.println("b = " +b); } }
The snapshot given below shows the sample run of above Java program, on swapping of two given numbers, with user input 30 as first and 40 as second number:
That is, the first number say 30 gets stored in a variable, and the second number say 40 gets stored in b variable. And using the statement:
temp = a;
Now temp holds the value of a, that is 30. Again using the following statement:
a = b;
The value of a becomes 40. And finally using the statement given below:
b = temp;
The value of temp, that is 30 gets initialized to b. So now, b holds the value of a, and a holds the value of b. That's it.
The above program can also be created in this way:
import java.util.Scanner; public class fresherearth { public static void main(String[] args) { Scanner s = new Scanner(System.in); System.out.print("Enter the First Number: "); int a = s.nextInt(); System.out.print("Enter the Second Number: "); int b = s.nextInt(); System.out.println("\n----Before Swap----"); System.out.println("a = " +a); System.out.println("b = " +b); int temp = a; a = b; b = temp; System.out.println("\n----After Swap----"); System.out.println("a = " +a); System.out.println("b = " +b); } }
Here is its sample run with same user input as of previous program's sample run:
Swap Two Numbers without using Third Variable in Java
This program does not uses any third variable like temp to swap two numbers. Rather it uses the simple addition and subtraction operation to do the job.
import java.util.Scanner; public class fresherearth { public static void main(String[] args) { Scanner s = new Scanner(System.in); System.out.print("Enter the First Number: "); int numOne = s.nextInt(); System.out.print("Enter the Second Number: "); int numTwo = s.nextInt(); System.out.println("\n----Before Swap----"); System.out.println("numOne = " +numOne); System.out.println("numTwo = " +numTwo); numOne = numOne + numTwo; numTwo = numOne - numTwo; numOne = numOne - numTwo; System.out.println("\n----After Swap----"); System.out.println("numOne = " +numOne); System.out.println("numTwo = " +numTwo); } }
Swap Two Numbers using Function in Java
This program uses a user-defined function named swap() that takes two arguments. The first argument refers to the first number, whereas the second argument refers to the second number. The function swaps the two passed arguments and prints the values after swap.
import java.util.Scanner; public class fresherearth { public static void main(String[] args) { Scanner s = new Scanner(System.in); System.out.print("Enter the First Number: "); int a = s.nextInt(); System.out.print("Enter the Second Number: "); int b = s.nextInt(); System.out.println("\n----Before Swap----"); System.out.println("a = " +a); System.out.println("b = " +b); swap(a, b); } public static void swap(int x, int y) { int z; z = x; x = y; y = z; System.out.println("\n----After Swap----"); System.out.println("a = " +x); System.out.println("b = " +y); } }
Swap Two Numbers using Bitwise Operator in Java
This program uses Bitwise operator to do the same job, that is, swapping of two numbers.
import java.util.Scanner; public class fresherearth { public static void main(String[] args) { Scanner s = new Scanner(System.in); System.out.print("Enter the First Number: "); int a = s.nextInt(); System.out.print("Enter the Second Number: "); int b = s.nextInt(); System.out.println("\n----Before Swap----"); System.out.println("a = " +a); System.out.println("b = " +b); a = a^b; b = a^b; a = a^b; System.out.println("\n----After Swap----"); System.out.println("a = " +a); System.out.println("b = " +b); } }
Note - The ^ is a Bitwise XOR or Bitwise Exclusive OR operator. To learn about this operator, refer to Bitwise Operators.
Same Program in Other Languages
« Previous Program Next Program »