pattern.matcher() vs pattern.matches()

I am wondering why the results of the java regex pattern.matcher() and pattern.matches() differ when provided the same regular expression and same string

String str = "hello+";
Pattern pattern = Pattern.compile("\\+");
Matcher matcher = pattern.matcher(str);

while (matcher.find()) {
    System.out.println("I found the text " + matcher.group() + " starting at " 
        + "index " + matcher.start() + " and ending at index " + matcher.end());
}

System.out.println(java.util.regex.Pattern.matches("\\+", str));

The result of the above are:

I found the text + starting at index 5 and ending at index 6
false

I found that using an expression to match the full string works fine in case of matches(".*\\+").