find-string-length()

Step 1: Declare the Function

First, you need to declare a function where you can pass the string from which you want to find the length. In Java, you can create a function using the keyword 'public' followed by the return type of the function. In this case, the return type will be 'int' because the length of a string is a numerical value. The name of the function will be 'findStringLength'.

public int findStringLength(String str){

}

Step 2: Using the length() Method

In Java, there is a built-in method for finding the length of a string- 'length()'. This method returns the length of any string which is equal to the number of 16-bit Unicode characters in the string.

Inside the function body, return the length of the string using 'length()' method.

public int findStringLength(String str){
   return str.length();
}

Step 3: Calling the function

Finally, let's call our function to see if it works. For this, we will need a 'main()' method. Inside 'main()' method, create a string and pass it to the 'findStringLength()' function, then print the result. In this example, 'Hello World' is passed to our function, which should return 11.

public class Main {
  public static void main(String[] args) {
    String testString = "Hello World";
    System.out.println(findStringLength(testString));
  }

  public static int findStringLength(String str){
    return str.length();
  }
}

In conclusion, this is how you can write a function in Java to find the length of any given string. The method length() is very useful for this purpose, as it directly returns the number of characters in a string without the need for any additional operations.