Which of the following is a primitive data type?

1. int
2. float
3. char
4. All of these

The return type of the isLowerCase() method is …………… .

1. int
2. boolean
3. char
4. String

The return type of the toLowerCase() method is …………… .

1. int
2. boolean
3. char
4. String

The value returned by Integer.parseInt("-321") is …………… .

1. -321
2. 321
3. 321.0
4. "321"