# Using content assist

In this section you will use content assist to finish writing a new method. Open the file junit.samples/VectorTest.java in the Java editor if you do not already have it open and select the `testSizeIsThree()` method in the Outline view. If the file doesn't contain such a method see Adding new methods for instructions on how to add this method.

1. Replace the `TODO` comment with the following lines.

   `assertTrue(fFull.size() == 3);
   Vector v = new Vector();
   for (int i=0; i<3; i++)
   v.addElement(new Object());
   assert
   `

2. With your cursor at the end of the word `assert`, press `Ctrl+Space` to activate content assist. The content assist window with a list of proposals will appear. Scroll the list to see the available choices.

3. With the content assist window still active, type the letter 't' in the source code after `assert` (with no space in between). The list is narrowed and only shows entries starting with 'assert'. Single-click various items in the list to view any available Javadoc help for each item.

4. Select `assertTrue(boolean)` from the list and press `Enter`. The code for the `assertTrue(boolean)` method is inserted.
5. Complete the line so that it reads as follows:

   `assertTrue(v.size() == fFull.size());`

6. Save the file.

### Related concepts

Java editor

### Related references

Java Content Assist
Java Editor Preferences