How to Append an Integer in a String in Java?

You can append an integer to a string in Java using the + operator. This operator performs string concatenation, combining the string and the integer into a single string.

Example:

String str = "The number is: ";
int num = 10;
String result = str + num;
System.out.println(result); // Output: The number is: 10

Explanation:

• The + operator concatenates the string str with the integer num.
• Java automatically converts the integer num into its string representation before appending it to the string str.
• The resulting string result contains both the original string and the appended integer.

Alternative Methods:

• String.valueOf(): This method converts the integer to its string representation, which can then be concatenated with the string.

   String str = "The number is: ";
   int num = 10;
   String result = str + String.valueOf(num);
   System.out.println(result); // Output: The number is: 10

• StringBuilder.append(): This method allows you to append the integer to a StringBuilder object, which can then be converted to a string.

   StringBuilder sb = new StringBuilder("The number is: ");
   int num = 10;
   sb.append(num);
   String result = sb.toString();
   System.out.println(result); // Output: The number is: 10

Practical Insights:

• Using the + operator for string concatenation is generally the most straightforward approach.
• For more complex string manipulation, consider using StringBuilder or StringBuffer for better performance.
• The String.valueOf() method is useful when you need to convert an integer to a string for other purposes.