double type numbers have decimal values with a fractional component.
They can be expressed in either standard or scientific notation. Standard notation consists of a whole number component followed by a decimal point followed by a fractional component.
For example, 2.0, 3.14159, and 0.6667.
public class Main {
public static void main(String args[]) {
double d = 3.14159;
System.out.print(d);//3.14159
}
}
Scientific notation uses a standard-notation, floating-point number plus a suffix that specifies a power of 10 by which the number is to be multiplied.
The exponent is indicated by an E or e followed by a decimal number, which can be positive or negative.
For example, 6.02E23, 314159E-05, and 4e+100.
public class Main {
public static void main(String[] argv) {
double d1 = 6.022E23;
double d2 = 314159E-05;
double d3 = 2e+100;
System.out.println("d1 is " + d1);
System.out.println("d2 is " + d2);
System.out.println("d3 is " + d3);
}
}
The output generated by this program is shown here:
d1 is 6.022E23
d2 is 3.14159
d3 is 2.0E100
You can explicitly specify a double literal by appending a D or d.
public class Main {
public static void main(String args[]) {
double d = 3.14159D;
System.out.print(d);//3.14159
}
}
Java's floating-point calculations are capable of returning +infinity, -infinity, +0.0, -0.0, and NaN
dividing a positive number by 0.0 returns +infinity. For example, System.out.println(1.0/0.0); outputs Infinity.
public class Main{
public static void main(String[] args) {
System.out.println(1.0/0.0);
}
}