Java program to Capitalize the First and Last letter of Each Word of a String
Capitalize the First and Last letter
Today we will look at java program, we’re going to capitalize all the first and last character of the words in a string.
Lets understand with the help of an example.
Input String:- prepinsta
Output String:- PrepinstA
Algorithm
- Take a string input from the user and store it in the variable called “s”.
- Take a “newstr” variable initialize with an empty string.
- Split the string into words and store it in the String array using regex.
- Take a for-each loop and store the first character by using subString() and store it in the “firstchar” and rest of the string store in “restchar” .
- Then add the “firstchar” and “restchar” string in “newstr”.
Note
Take a string input from the user and store it in the variable called "s". Take a new variable "newstr" and initialize it with an empty string. Split the string into words and store it in the String array using regex. Take a for-each loop and store the first character by using subString() and capitalize that first character using upperCase() method and store it in the "firstchar" and rest of the string from 1 to length-1 store in "restchar" , get the last character of string using charAt() method and convert that character to string using toString() and then add the "firstchar" and "restchar" string in "newstr"
Code in Java
import java.util.Scanner;
public class CapitalizeTheFirstAndLastLetterOfString {
public static void main(String[] args) {
Scanner sc =new Scanner(System.in);
System.out.print("Enter String : ");
String s = sc.nextLine();
String newstr = "";
String[] str = s.split("\\s"); // splitting sentence into word converted to String array
for (String string : str) {
int length = string.length();
String firstchar = string.substring(0, 1);
String restchar = string.substring(1, length - 1);
String lastchar = Character.toString(string.charAt(length - 1));
newstr = newstr+firstchar.toUpperCase()+restchar+" ";
}
System.out.println(newstr);
}
}
Output
Enter String : prep inst is best
PreP InstA IS BesT
Method 2 (Capitalize the First and Last letter)
class Main {
static String FirstAndLast(String str)
{
// Create an equivalent char array of given string
char[] ch = str.toCharArray();
for (int i = 0; i < ch.length; i++) {
// k stores index of first character and i is going to store index of last character.
int k = i;
while (i < ch.length && ch[i] != ' ')
i++;
// Check if the character is a small letter If yes, then Capitalise
ch[k] = (char)(ch[k] >= 'a' && ch[k] <= 'z'
? ((int)ch[k] - 32)
: (int)ch[k]);
ch[i - 1] = (char)(ch[i - 1] >= 'a' && ch[i - 1] <= 'z'
? ((int)ch[i - 1] - 32)
: (int)ch[i - 1]);
}
return new String(ch);
}
public static void main(String args[])
{
String str = "Prep insta";
System.out.println("Input String:- "+str);
System.out.println("String after Capitalize the first and last character of each word in a string:- "+FirstAndLast(str));
}
}
Output
Input String:- Prep insta String after Capitalize the first and last character of each word in a string:- PreP InstA
Note
The time complexity of above method is o(n) as we are iterating over the string once in the for loop
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import java.util.*;
public class Main {
public static void main(String args[]) {
Scanner sc =new Scanner(System.in);
String s = sc.nextLine();
String newstr = “”;
String[] str = s.split(“\\s”); // splitting sentence into word converted to String array
for (String string : str) {
int length = string.length();
if(length==1){
String firstchar = string.substring(0, 1).toUpperCase();
newstr = newstr+firstchar +” “;
continue;
}
String firstchar1 = string.substring(0, 1).toUpperCase();
String restchar = string.substring(1, length – 1);
String lastchar = string.substring(length – 1).toUpperCase();
newstr = newstr+firstchar1+restchar+lastchar+” “;
}
System.out.println(newstr);
}
}
public static void capitalizeString(String s)
{
String[] str=s.split(” “);
String result=””;
for(int i=0;i<str.length;i++)
{
char[] ch=str[i].toCharArray();
int n=ch.length;
ch[0]=Character.toUpperCase(ch[0]);
ch[n-1]=Character.toUpperCase(ch[n-1]);
String str1=new String(ch);
result=result+str1+" ";
}
System.out.println(result);
}
import java.util.Scanner;
public class CapitalizeWords {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.println(“Enter a sentence in lowercase:”);
String sentence = scanner.nextLine();
String capitalizedSentence = “”;
boolean capitalizeNext = true;
for (int i = 0; i < sentence.length(); i++) {
char c = sentence.charAt(i);
if (capitalizeNext && c != ' ') {
c = Character.toUpperCase(c);
capitalizeNext = false;
} else if (c == ' ') {
capitalizeNext = true;
}
capitalizedSentence += c;
}
System.out.println("Capitalized sentence: " + capitalizedSentence);
scanner.close();
}
}
public static void main(String[] args) {
Scanner ip=new Scanner(System.in);
String str =ip.nextLine();
char[] s=str.toCharArray();
s[0]= (char)(s[0]-32);
for(int i=1;i<s.length-1;i++){
if((s[i]==' ')){
s[i+1]=(char)(s[i+1]-32);
s[i-1]=(char)(s[i-1]-32);
}
}
s[s.length-1]=(char)(s[s.length-1]-32);
System.out.println(s);
}
import java.util.Scanner;
public class techmonastic {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.print(“Enter String :”);
String s = sc.nextLine();
String [] sp=s.split(“\\s”);
String newstr=””;
for(String res:sp)
{
String midstr=res.substring(1,res.length()-1);
String fstr=res.substring(0,1);
String lstr=res.substring(res.length()-1);
newstr=newstr+fstr.toUpperCase()+midstr+lstr.toUpperCase()+” “;
}
System.out.println(newstr);
}
}
public static String capitalizeFirstAndLast(String s)
{
if(s.length() <=1 ) return s;
char [] arr = s.toCharArray();
arr[0] = Character.toUpperCase(arr[0]);
arr[arr.length-1] = Character.toUpperCase(arr[arr.length-1]);
for( int i = 1 ; i < arr.length -2 ; i++)
{
if(arr[i] == ' '){
arr[i-1] = Character.toUpperCase(arr[i-1]);
arr[i+1] = Character.toUpperCase(arr[i+1]);}
}
return String.valueOf(arr);
}
wrong code
Refer below
package Strings;
import java.util.Scanner;
public class Capitalize_the_first_and_last_character_of_each_word_of_a_string_2 {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.print(“Enter String : “);
String s = sc.nextLine();
String newstr = “”;
String[] str = s.split(“\\s”);
for (int i = 0; i 1) {
firstchar = string.substring(0, 1);
restchar = string.substring(1, length – 1);
lastchar = Character.toString(string.charAt(length – 1));
}else {
singlechar = string.toUpperCase();
}
newstr = newstr + firstchar.toUpperCase() + restchar + lastchar.toUpperCase() + singlechar + ” “;
}
System.out.println(newstr);
}
}
Scanner sc=new Scanner(System.in); String str=sc.nextLine(); String [] arr = str.split(” “); String res=””;
res+=Character.toUpperCase(str.charAt(0));
for(int i=1;i<str.length()-1;i++){
if(str.charAt(i+1)==' '|| str.charAt(i-1)==' ') {
res+=Character.toUpperCase(str.charAt(i));
}
else
res+=str.charAt(i);
}
res+=Character.toUpperCase(str.charAt(str.length()-1));
System.out.println(res);
String s=”prep insta is best”;
String temp=””;
String str[]=s.split(” “);
for(String s1:str)
{
for(int i=0;i<s1.length();i++)
{
if(i==0 || i==s1.length()-1)
{
temp+=String.valueOf(s1.charAt(i)).toUpperCase();
}
else
{
temp+=s1.charAt(i);
}
}
}
System.out.println(temp);
public static void main(String[] args) {
Scanner sc =new Scanner(System.in);
System.out.print(“Enter String : “);
String s = sc.nextLine();
StringBuilder newString = new StringBuilder();
String[] str = s.split(“\\s”);
for (String string : str) {
int len = string.length();
String firstChar = string.substring(0,1).toUpperCase();
String restChar = string.substring(1, len-1);
char lastChar = Character.toUpperCase(string.charAt(len-1));
newString.append(firstChar).append(restChar).append(lastChar).append(” “);
}
System.out.println(newString);
}
public static void main(String[] args) {
String str=”hai preinsta”;
String[] x=str.split(” “);
for(int i=0;i<x.length;i++)
{
String y=x[i];
System.out.print(y.substring(0,1).toUpperCase()+y.substring(1,y.length()-1)+y.substring(y.length()-1,y.length()).toUpperCase());
}
}
String s = sc.nextLine();
String newstr = “”;
String[] str = s.split(” “); // splitting sentence into word converted to String array
for (int i=0; i<str.length;i++) {
newstr = newstr + Character.toUpperCase(str[i].charAt(0));
for(int j=1; j<str[i].length()-1;j++)
newstr = newstr + str[i].charAt(j);
newstr = newstr + Character.toUpperCase(str[i].charAt(str[i].length()-1))+" ";
}System.out.println(newstr);