Increase java heap size tomcat eclipse

• Open the server tab in eclipse
• right click open
• click on open lauch configuration
• Go to arguments
• Here you can add in VM arguments after endorsed

  -Xms64m -Xmx256m

Increase java heap memory in eclipse

It is possible to increase heap size allocated by the JVM in eclipse directly In eclipse IDE goto

Run---->Run Configurations---->Arguments

Enter -Xmx1g(It is used to set the max size like Xmx256m or Xmx1g...... m-->mb g--->gb)

increase java heap memory command prompt

It is possible to increase heap size allocated by the JVM by using command line options Here we have 3 options

-Xms<size>        set initial Java heap size
-Xmx<size>        set maximum Java heap size
-Xss<size>        set java thread stack size

java -Xms16m -Xmx64m ClassName
In the above line we are setting minimum heap to 16mb and maximum heap 64mb

multiplication table in java

import java.util.Scanner;

class MultiplicationTable

{

   public static void main(String args[])

   {

      int number, a;

      System.out.println("which table you want");

      Scanner in = new Scanner(System.in);

      number = in.nextInt();

      System.out.println("Multiplication table of "+number+" is :-");

      for ( a = 1 ; a <= 10 ; a++ )

         System.out.println(number+"*"+a+" = "+(number*a));

   }

}

Output: 

  

                 

which table you want

4

Multiplication table of 4 is :-

4*1 = 4

4*2 = 8

4*3 = 12

4*4 = 16

4*5 = 20

4*6 = 24

4*7 = 28

4*8 = 32

4*9 = 36

4*10 = 40

Reverse a string in java

public class ReverseString {

      public static void main(String[] args) {

            String word = "Hai this is karthik";

            word = new StringBuffer(word).reverse().toString();

            System.out.println(word);

      }

}

Output:

             kihtrak si siht iaH

import java.util.*;

class ReverseString

{

   public static void main(String args[])

   {

      String reverse ="";

      System.out.println("Enter the String");

      Scanner scan = new Scanner(System.in);

      String  original = scan.nextLine();

      int length = original.length();

      for ( int i = length - 1 ; i >= 0 ; i-- )

         reverse = reverse + original.charAt(i);

      System.out.println("Reverse string is: "+reverse);

   }

}

Output:

Enter the String

hai this is karthik

Reverse string is: kihtrak si siht iah

Using StringTokenizer word by word 

   import java.util.StringTokenizer;

public class ReverseLine {

      public static void main(String[] args) {

            String word = "Java Reverse String";

            StringTokenizer st = new StringTokenizer(word, " ");

            String stringReversedLine = "";

            while (st.hasMoreTokens()) {

                  stringReversedLine = st.nextToken() + " " + stringReversedLine;

            }

            System.out.println("Reversed string by word :" + stringReversedLine);

      }

}

Output:

                   Reversed string is : String Reverse Java 

     

swapping two numbers in java

import java.util.Scanner;

public class SwapElementsWithoutThirdVariableExample {

      public static void main(String[] args) {

            Scanner scan = new Scanner(System.in);

            System.out.println("Enter the value of a ");

            int a = scan.nextInt();

            System.out.println("Enter the value of b");

            int b = scan.nextInt();

            System.out.println("Before Swapping");

            System.out.println("Value of a is :" + a);

            System.out.println("Value of b is :" + b);

            a = a + b;

            b = a - b;

            a = a - b;

            System.out.println("After Swapping");

            System.out.println("Value of a is :" + a);

            System.out.println("Value of  b is :" + b);

      }

}

Output:

Enter the value of a

100

Enter the value of b

200

Before Swapping

Value of a is :100

Value of b is :200

After Swapping

Value of a is :200

Value of  b is :100

factorial program in java

import java.util.Scanner;

public class Factorial {

      public static void main(String[] args) {

        System.out.println("Enter the number");

            Scanner scan = new Scanner(System.in);

            int number = scan.nextInt();

            int factorial = number;

            for (int i = 1; i < number; i++) {

                  factorial = factorial * i;

            }

            System.out.println("Factorial of a "+number+" is"+" "+ factorial);

      }

}

Output:

Enter the number

5

Factorial of a 5 is 120