Java IO.pdf - Nguyen Dang Binh

public void setMaximumIntegerDigits(int newValue)
public void setMinimumIntegerDigits(int newValue)
public void setMaximumFractionDigits(int newValue)
public void setMinimumFractionDigits(int newValue)
Java I/O
For example, to specify that myFormat should format numbers with at least 10 digits before
the decimal point and at most 3 digits after, you would type:
myFormat.setMinimumIntegerDigits(10);
myFormat.setMaximumFractionDigits(3);
Setting the minimum digits guarantees that those digits will be printed, filled with zeros if
necessary. Setting the maximum digits allows the digits to be printed if they're nonzero or a
place-holding zero (i.e., not the leftmost or rightmost digit). Leftmost and rightmost strings of
zeros will only be printed if it's required to meet the minimum number of digits. If you try to
set a maximum below a minimum or a minimum above a maximum, the last one set takes
precedence. Java raises the maximum to meet the minimum or lowers the minimum to meet
the maximum.
Specifying the number of digits is useful when printing many columns of numbers in a tabular
format to the console or in a monospaced font. Example 16.2 prints a three-column table of
the angles between and 360 degrees in degrees, radians and grads without any formatting.
Example 16.2. UglyTable
public class UglyTable {
}
public static void main(String[] args) {
}
System.out.println("Degrees \tRadians \tGrads");
for (double degrees = 0.0; degrees < 360.0; degrees++) {
double radians = Math.PI * degrees / 180.0;
double grads = 400 * degrees / 360;
System.out.println(degrees + "\t" + radians + "\t" + grads);
}
Its output looks like this (not very pretty):
300.0 5.2359877559829835 333.3333333333333
301.0 5.253441048502927 334.44444444444446
302.0 5.27089434102287 335.55555555555554
303.0 5.288347633542813 336.6666666666667
304.0 5.305800926062757 337.77777777777777
305.0 5.3232542185827 338.8888888888889
306.0 5.340707511102643 340.0
Example 16.3 prints the same table with each number formatted to at least three integer digits
and exactly two fraction digits (both minimum and maximum set to 2).
403