Double/Float

Question 1

Constructor

Answer 1

• Double(double value)

Constructs a newly allocated Double object that represents the primitive double argument.

• Double(String s) throws NumberFormatException

Constructs a newly allocated Double object that represents the floating-point value of type double represented by the string. The string is converted to a double value as if by the valueOf method.

Question 2

compare/compareTo

Answer 2

• int compare(double d1, double d2)

Compares the two specified double values.

• compareTo(Double anotherDouble)

Compares two Double objects numerically

Question 3

equals(Object obj) and toString()

Answer 3

• equals(Object obj)

Compares this object against the specified object.

• String toString()

Returns a string representation of this Double object.

• String toString(double d)

Returns a string representation of the double argument.

Question 4

long/float/double/byte/short/intValue

Answer 4

• Returns the value of this Double as a long/float/double/short/byte/int value

Question 5

valueOf(double d/String s)

Answer 5

• Double valueOf(double d)

Returns a Double instance representing the specified double value.

• Double valueOf(String s) throws NumberFormatException

Returns a Double object holding the double value represented by the argument string s.

Question 6

parseDouble(String s)

Answer 6

• parseDouble(String s) throws NumberFormatException

Returns a new double initialized to the value represented by the specified String, as performed by the valueOf method of class Double.