The following string variable is defined:

String s = "abc";

Which of the following operations are allowed?

```
int i = s[0];
```
```
s += s + s;
```
```
s = 2 * s;
```
```
s = (String) (46 >> 2);
```

Explanation

String conversion in Java is performed implicitly and only in one case: when string and non-string are concatenated.
For example, the following will be allowed:
s = "" + (46 >> 2); // empty string + number
Number will be implicitly converted to string in this case.