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Text: JAVA - Data Structures I am done with Q. 1. But need help with parts 2, 3, AND 4. Q. Write a recursive method to reverse a string. Use the StringBuilder to hold the string. Here are some StringBuilder ideas. 1. There are two ways to put a string into a StringBuilder. You can do it in one line: StringBuilder myString = new StringBuilder("ABCDEFG"); or with two lines. The first line creates the StringBuilder object: StringBuilder myString; and the second line assigns it a value: myString = new StringBuilder("ABCDEFG"); Of course, the only reason to use two lines is if you want to create the variable first and store something in it later. 2. To access a particular character in a StringBuilder object, use the charAt method: System.out.println(myString.charAt(2)); This will print C. Remember, the first character in the StringBuilder object is character 0. 3. To work with the last character, use: myString.charAt(myString.length() - 1) 4. To delete character 3, use: myString.deleteCharAt(3); This deletes the character D, since the first character is character 0.

          Text: JAVA - Data Structures
I am done with Q. 1. But need help with parts 2, 3, AND 4.

Q.
Write a recursive method to reverse a string.
Use the StringBuilder to hold the string. Here are some StringBuilder ideas.

1. There are two ways to put a string into a StringBuilder. You can do it in one line:
   StringBuilder myString = new StringBuilder("ABCDEFG");
   or with two lines. The first line creates the StringBuilder object:
   StringBuilder myString;
   and the second line assigns it a value:
   myString = new StringBuilder("ABCDEFG");
   Of course, the only reason to use two lines is if you want to create the variable first and store something in it later.

2. To access a particular character in a StringBuilder object, use the charAt method:
   System.out.println(myString.charAt(2));
   This will print C. Remember, the first character in the StringBuilder object is character 0.

3. To work with the last character, use:
   myString.charAt(myString.length() - 1)

4. To delete character 3, use:
   myString.deleteCharAt(3);
   This deletes the character D, since the first character is character 0.

Added by Stephen H.

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