To check if a string s contains the prefix "Java", you may write
```
a. if (s.startsWith("Java")) ...
b. if (s.indexOf("Java") == 0) ...
c. if (s.substring(0, 4).equals("Java")) ...
d. if (s.charAt(0) == 'J' && s.charAt(1) == 'a' && s.charAt(2) == 'v' && s.charAt(3) == 'a') ...
```
```
a. if (s.startsWith("Java")) ...
b. if (s.indexOf("Java") == 0) ...
c. if (s.substring(0, 4).equals("Java")) ...
d. if (s.charAt(0) == 'J' && s.charAt(1) == 'a' && s.charAt(2) == 'v' && s.charAt(3) == 'a') ...
```
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