Learn Programming

Count The Number of Words in a Given String

String : Sateesh kumar
Count words: 2

import java.util.*;
class TokenizerDemo
{
public static void main(String args[])
{
   String s="Hello students ,welcome to msk tutorials";
   StringTokenizer st=new StringTokenizer(s," ");
   int count=0;
   while(st.hasMoreTokens())
   {
       count++;
       st.nextToken()
   }
   System.out.pritln("Number of Words are"+ count);
   }
}

String : Sateesh kumar
Count words: 2

more programs visit http://sateeshm.com/

How to print duplicate characters from the string with its count.?

Input: Sateesh
Output:
Char: S, Count: 2 times.
Char: a, Count: 1 times.
Char: t, Count: 1 times.
Char: e, Count: 2 times.
Char: h, Count: 1 times.

public class Demo1 {

public static void main(String[] args) {

String s="sateesh";

int count=0,len=0;

while(len!=1)

{

char name[]=s.toCharArray();

len=name.length;

count=0;

for(int j=0;j<len;j++)

{

if((name[0]==name[j])&&((name[0]>=65&&name[0]<=91)|| (name[0]>=97&&name[0]<=123)))

count++;

}

if(count!=0)

System.out.println(name[0]+" "+count+" Times");

s=s.replace(""+name[0],"");

}

Output:
Char: S, Count: 2 times.
Char: a, Count: 1 times.
Char: t, Count: 1 times.
Char: e, Count: 2 times.
Char: h, Count: 1 times.

more programs visit http://sateeshm.com/

We can say if two strings are an anagram of each other if they contain the same characters but at different orders.

String str1="sateesh";

String str2="sateehs";

Output: Same

import java.util.Arrays;

public class Demo1 {

public static void main(String[] args) {

String str1="sateesh";

String str2="sateehs";

boolean [] char_set = new boolean[256];

boolean [] char_set1 = new boolean [256];

for(int i =0;i<str1.length();i++){

int val1 = str1.charAt(i);

int val2 = str2.charAt(i);

char_set[val1] = true;

char_set1[val2] = true;

}

if(Arrays.equals(char_set, char_set1)){

System.out.println("Same");

}

else

{

System.out.println("Not a same");

}

Output:

same

more programs visit http://sateeshm.com/

How to reverse the words from the given string sentence?

String: MSK Technologies

Output: KSM seigolonhceT

public class Demo1 {

public static void main(String[] args) {

String s="MSK Technologies";

String[] words = s.split(" ");

int x,y;

String reverseString = "";

for ( x = 0; x < words.length; x++)

{

String word = words[x];

String reverseWord = "";

for ( y = word.length()-1; y >= 0; y--)

{

reverseWord = reverseWord + word.charAt(y);

}

reverseString = reverseString + reverseWord + " ";

}

System.out.println(s);

System.out.println(reverseString);

}

Output:

KSM seigolonhceT

more programs visit http://sateeshm.com/

remove first and last occurrence of string java

String: codedecode

input: e

Output: coddecod

public class Demo200 {

public static void main(String[] args) {

String s="codedecode";

char ch='e';

for (int i = 0; i < s.length(); i++)

{

if (s.charAt(i) == ch)

{

s = s.substring(0, i) +

s.substring(i + 1);

break;

}

for (int i = s.length() - 1; i > -1; i--)

{

if (s.charAt(i) == ch)

{

s = s.substring(0, i) +

s.substring(i + 1);

break;

}

System.out.println(s);

}

Output:

coddecod

more programs visit http://sateeshm.com/

Count the unique characters in a given String

String: Sateesh

Output: 3

public class Demo200 {

public static void main(String[] args) {

String s="sateesh";

StringBuffer str=new StringBuffer(s);

for (int i = 0; i < str.length(); i++)

{

int flag = 0;

for (int j = 0; j < str.length(); j++)

{

if (str.charAt(i) == str.charAt(j) && i != j)

{

flag = 1;

break;

}

if (flag == 0)

System.out.print(str.charAt(i));

}

Output:

more programs visit http://sateeshm.com/

Display unique characters in a given String

String: Sateesh

Output: ath

public class Demo200 {

public static void main(String[] args) {

String s="sateesh";

StringBuffer str=new StringBuffer(s);

for (int i = 0; i < str.length(); i++)

{

int flag = 0;

for (int j = 0; j < str.length(); j++)

{

if (str.charAt(i) == str.charAt(j) && i != j)

{

flag = 1;

break;

}

if (flag == 0)

System.out.print(str.charAt(i));

}

Output:

ath

more programs visit http://sateeshm.com/

Count the number of divisible numbers in a given range

Range: 1-100

Number : 2

Output: 50

import java.util.Scanner;

public class Demo {

public static void main(String[] args) {

int x=1,n,count=0;

Scanner s=new Scanner(System.in);

System.out.println("Enter n value");

n=s.nextInt();

{

if(x%n==0)

{

count=count+1;

}

x++;

}while(x<=100);

System.out.println(count);

}

Output:

Enter n value

more programs visit http://sateeshm.com/