Strings Problems In Java

				
					Ans. package stringproblems;
public class Pallindrome {
	public static void main(String[] args) {
		String input="radar"; // Before checking if 2 strings are palindrome first we take 2 strings, reverse the strings and store them in separate variables output and output1 for input and input1 strings respectively. 
		String output="";
		String input1="ramesh";
		String output1="";
		for(int i=input.length()-1;i>=0;i--)// For Loop is used to print all elements of string and in string reversal printing will start from last element and end in first element of string so the initial condition is taken as position or index of  last element of string and since indexing ends at position less than length of string so the last index is taken as length-1  and final condition is index of first element and it is taken as zero because indexing starts from zero.  
		{
			char rev=input.charAt(i); // It is used for finding out characters at each index position in reverse order


			output=output+rev; // For finding out the string in the reverse order


		}
System.out.println(output); // It will print the string in reverse order 


if(input.equals(output)) //Using equals method of string concept we are comparing whether given string stored in ”input” variable is equal to its reversed string value stored in “output” variable.
{
	System.out.println("is a pallindrome");//If the string and its reverse are equal it will print this statement
}
else
{
	System.out.println("not a pallindrome"); //If the string and its reverse are not equal it will print this statement


}//The similar procedure we are following for “ramesh” string stored in “input1” variable and its reversed stored in “output1” variable.
for(int i=input1.length()-1;i>=0;i--)
		{
			char rev1=input1.charAt(i);
			output1=output1+rev1;
		}
System.out.println(output1);
if(input1.equals(output1))
{
	System.out.println("is a pallindrome");
}
else
{
	System.out.println("not a pallindrome");
}
	}
}

				
			

				
					 Ans. package stringproblems;
public class Space {
	public static void main(String[] args) {
		boolean s2=false; // first boolean value is declared and initialized as false so that in upcoming logic of program a statement will be printed that string contains space.
		String idea="Idea143 123"; //a string containing space is taken and stored in”idea” variable.
			char s1[]=	idea.toCharArray(); // string is converted to array using “tochararray” method since there is no string method to prove presence of space
			for(int i=0;i<idea.length();i++)// after converting string to array, for loop is used to detect presence of space in the array.
			{			
			 s2=	Character.isWhitespace(s1[i]); //space is checked in every index of array using “isWhitespace” method 
			
			if(s2==true) // if space is present then it will print below statement  
			{
				System.out.println("Hello space");
			}
	}
	}}