Create 12b. Letter triangle

Week 2: Methods, strings and lists/12b. Letter triangle

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+Write a program that asks the user to enter a string.
+The program will then print a triangle of letters corresponding to the string, as shown in the sample printouts below.
+
+
+Example output:
+Give a string: hello
+h
+he
+hel
+hell
+hello
+
+
+
+
+import java.util.Random;
+import java.util.Scanner;
+
+
+
+public class Test{
+    public static void main(String[] args){
+        final Random r = new Random();
+        
+        
+        //ADD
+        Scanner reader= new Scanner(System.in);
+        System.out.print("Give a string: ");
+        String user_str = String.valueOf(reader.nextLine());
+
+        int wordLastIdx = user_str.length() - 1;
+        for (int i = 0; i <= wordLastIdx; i++) {
+            System.out.println(user_str.substring(0, i+1));
+        }
+                
+       
+    }
+}
+
+
+
+
+
+
+Testing with input abcdef
+Give a string: abcdef
+a
+ab
+abc
+abcd
+abcde
+abcdef
+
+Testing with input hi
+Give a string: hi
+h
+hi
+
+Testing with input xxxxx
+Give a string: xxxxx
+x
+xx
+xxx
+xxxx
+xxxxx
+
+Testing with input goodevening
+Give a string: goodevening
+g
+go
+goo
+good
+goode
+goodev
+goodeve
+goodeven
+goodeveni
+goodevenin
+goodevening
+
+
+