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public class StringTest {public STATIC void main(STRING[] args) { String str1 = new String("interviewbit"); String str2 = new String("INTERVIEWBIT"); System.out.println(str1 = str2);}}

This program prints "INTERVIEWBIT" since str2 String is assigned to str1 String. The comparison operator “==” should not be confused with the assignment operator “=”.

Here's everything you need to know about Java String interview questions and answers. To summarize, there are many specifics RELATED to String that every Java programmer needs to be familiar with and these String questions will not just help you prepare better for Java interviews, but will also open a new door to learning more about String. 

The more familiar you are with these frequently asked interview questions, the greater your chances of getting hired.

Hopefully, we were ABLE to answer any questions or concerns you had. Wishing you luck in your future endeavours. 

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String str1 = "scaler"; //Line1String STR2 = new String("scaler"); //Line2str2.intern(); //Line 3System.out.println(str1 == str2);

The output of the above program is false. We know that when the intern() method is executed or invoked on a string object, then it checks whether the String pool already has a same string value (scaler) or not, and if it is available, then the reference to the that string from the string constant pool is returned. In the above EXAMPLE, the intern method is invoked on str2. However, since we didn't assign it back to str2, str2 REMAINS UNCHANGED and therefore, both str1 and str2 have different references. If we change the code in line 3 to str2 = str2.intern(), then the output will be true.

When a string is the same when read right to LEFT or left to right, it is called a palindrome. To assess whether a string is a palindrome or not, we first reverse the string and then compare the reversed string with the original ONE. Below is a JAVA program that will check if a string is a palindrome.

Output:

As shown in the above example, we have a string "Rotator" stored in string object "str1" and another string object "revstr" to store the reverse of str1. To check whether two strings are equal or not, we have used the equals() method. 

There are several ways to remove a character from a string, such as REMOVING the character at the beginning of the string, the end of the string, or at a specific position. It is possible to remove a specific character from a string using the replace() method. You can also use remove() with different VARIATIONS like replaceFirst(), replaceAll(), etc. Below is a JAVA program that uses replace(), replaceFirst(), and replaceAll() methods to remove characters from a String.

Output:

If two strings contain the same characters but in a different ORDER, they can be said to be anagrams. Consider dusty and study. In this case, dusty's characters can be formed into a study, or study's characters can be formed into dusty. Below is a java program to check if two strings are anagrams or not.

Output:

In the above program, there are two strings i.e., str1 and str2. Here, we are comparing str1 and str2 to determine if they are anagrams. The strings are first converted to lowercase since Java is case-sensitive and B and b are two different characters in Java. Here,

• str1.toCharArray(): Convert or transform the string into a char array.
• Arrays.sort(): It sorts the char arrays.
• Arrays.equals(): Checks or verifies if sorted char arrays are EQUAL.

In the case where sorted arrays are equal, the strings are anagrams.

The charAt() method of the String class can be USED to find out the number of times a specified character appears in a string. Below is a Java program to check the occurrences of a specified character in a string.

OUTPUT: 

As you can see, the above program checks how many times the character ch OCCURS in the string str. Whenever we encounter the character ch in the string, we increase the count by one. Finally, we print the total character count at the end.

An array can be CONVERTED to a string in four different ways such as Arrays.toString() method, String.Join() method, StringBuilder.append() method, and Collectors.joining() method. Here, we will see an example of the Array.toString() method. Arrays.toString() returns a string representation of the array contents. The string represents the array's elements as a list, enclosed in square brackets ("[]"). The characters ", " (a comma) FOLLOWED by a space are used to separate adjacent elements. It returns “null” if the array is null.

Output:

There are different ways to reverse a STRING in Java-like using CharAt() method, StringBuilder/StringBuffer Class, Reverse Iteration, ETC. The reverse() method is AVAILABLE in both the StringBuilder and StringBuffer classes and is commonly used to reverse a string. The reverse () method simply reverses the order of the characters. Below is a Java program to reverse a string using the StringBuilder class.

Output:

To FIND the total count of characters in a specified STRING, we can use the for loop, while loop, or do while loop. Below is a Java program to calculate the total number of characters in a string using for loop.

Output:

The TERM "permutation of the string" refers to all of the conceivable new strings that can be created by swapping the positions of the given string's characters. For example, the string CAT has a total of 6 permutations i.e., [CAT, CTA, ACT, ATC, TCA, TAC]. Below is a JAVA program to print all permutations of a given string.

Output: