July 2018 - InstanceOfJava

How to Convert string to StringBuilder and vise versa in Java

Posted by: Instanceofjava Posted date: 10:45 AM / comment : 0 java programming interview questions

We can Covert String to string builder in two ways

Using constructor of StringBuilder(String s)
Using append method of StringBuilder

Lets see a java program to convert java String object to StringBuilder using constructor of StringBuilder class.

#1: Java program to convert string to StringBuilder using constructor of StringBuilder class.

package com.instanceofjava;
/**
* @author www.Instanceofjava.com
* @category interview programs
*
* Description: Java Program to convert String to StringBuilder
*
*/
public class StringBuilderDemo {
public static void main(String[] args) {
String str="java";
StringBuilder sb = new StringBuilder(str);
String s = sb.toString();
System.out.println(s);
StringBuilder stebldr= new StringBuilder("convert string to stringbuilder");
String st = stebldr.toString();
System.out.println(st);
}
}

Output

java
convert string to stringbuilder

#2: Java program to convert string to StringBuilder using append method of StringBuilder class.

package com.instanceofjava;
/**
* @author www.Instanceofjava.com
* @category interview programs
*
* Description: Java Program to convert String to StringBuilder
*
*/
public class StringBuilderDemo {
public static void main(String[] args) {
StringBuilder sb = new StringBuilder();
sb.append("Java convert string to StringBuilder ");
System.out.println(sb);
String str= "Convert string to Stringbuilder" ;
sb.append(str);
System.out.println(sb);
}
}

Output

Java convert string to StringBuilder
Java convert string to StringBuilder Convert string to Stringbuilder

We can Convert StringBuilder to String by using toString() method of StringBuilder class.
How to convert StringBuilder to String in java.

#3: Java program to convert string to StringBuilder using append method of StringBuilder class.

package com.instanceofjava;
/**
* @author www.Instanceofjava.com
* @category interview programs
*
* Description: Java Program to convert StringBuilder to String
*
*/
public class StringBuilderDemo {
public static void main(String[] args) {
StringBuilder sb = new StringBuilder();
sb.append("Java convert StringBuilder to string");
String str=sb.toString();
System.out.println(str);
String s= "Convert Stringbuilder to string " ;
sb.append(s);
String st=sb.toString();
System.out.println(st);
}
}

Output

Java convert StringBuilder to string
Java convert StringBuilder to stringConvert Stringbuilder to string

java program to convert string to string builder

Java Program to check a String is palindrome or not by ignoring its case

Posted by: Instanceofjava Posted date: 3:32 PM / comment : 0 java programming interview questions , java programs for freshers

A palindrome is a word that reads the same backward or forward.
Lets see what if the characters in a palindrome string are in different case. i.e should not be case sensitive.
So now we will see how to check a string is palindrome or not by ignoring its case.
Write a function which checks that string is palindrome or not by converting the original string to lowercase or uppercase.
Method should return true if it is palindrome, return false if not a palindrome.

#1 : Java Program to check given string is palindrome or not by ignoring its case.

package com.instanceofjava;
public class CheckPalindrome {
public static boolean isPalindrome(String str) {
StringBuffer strone=new StringBuffer(str.toLowerCase());
StringBuffer strtwo=new StringBuffer(strone);
strone.reverse();
System.out.println("Orginal String ="+strtwo);
System.out.println("After Reverse ="+strone);
if(String.valueOf(strone).compareTo(String.valueOf(strtwo))==0)
return true;
else
return false;
}
public static void main(String[] args) {
boolean ispalindrome= isPalindrome("DeleveleD");
System.out.println(ispalindrome);
}
}

Output

Orginal String =deleveled
After Reverse =deleveled
true

check palindrome or not ignore case sensitive

Subscribe to: Posts ( Atom )