Question 1

? What is the difference between string literals and string objects in Java

Accepted Answer

String literals are string values enclosed in double quotes, such as "hello". They are stored in a special memory area called the string constant pool and are automatically interned by the JVM, meaning that multiple references to the same string literal will point to the same memory location. String objects, on the other hand, are instances of the String class created using the new keyword, such as new String("hello"). Unlike string literals, string objects are stored in the heap memory and are not automatically interned.

Question 2

?How can you concatenate strings in Java

Accepted Answer

There are multiple ways to concatenate strings in Java. One common method is to use the + operator, which concatenates two strings together. For example:

java
Copy code
String str1 = "Hello";
String str2 = "World";
String result = str1 + " " + str2;
System.out.println(result); // Output: Hello World
Another approach is to use the concat() method of the String class, which concatenates the specified string to the end of the invoking string:

java
Copy code
String str1 = "Hello";
String str2 = "World";
String result = str1.concat(" ").concat(str2);
System.out.println(result); // Output: Hello World
Additionally, you can use the StringBuilder or StringBuffer classes for more efficient string concatenation, especially when dealing with large strings or concatenating strings in a loop.

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