Examples with DecimalFormat java.text.DecimalFormat used on opensource projects

Example 46 with DecimalFormat

use of java.text.DecimalFormat in project j2objc by google.

the class DecimalFormatTest method assertDecimalFormatIsLossless.

private static void assertDecimalFormatIsLossless(double d) throws Exception {
    final DecimalFormatSymbols dfs = new DecimalFormatSymbols(Locale.US);
    DecimalFormat format = new DecimalFormat("#0.#", dfs);
    format.setGroupingUsed(false);
    format.setMaximumIntegerDigits(400);
    format.setMaximumFractionDigits(400);
    // Every floating point binary can be represented exactly in decimal if you have enough
    // digits. This shows the value actually being tested.
    String testId = "decimalValue: " + new BigDecimal(d);
    // As a sanity check we try out parseDouble() with the string generated by
    // Double.toString(). Strictly speaking Double.toString() is probably not guaranteed to be
    // lossless, but in reality it probably is, or at least is close enough.
    assertDoubleEqual(testId + " failed parseDouble(toString()) sanity check", d, Double.parseDouble(Double.toString(d)));
    // Format the number: If this is lossy it is a problem. We are trying to check that it
    // doesn't lose any unnecessary precision.
    String result = format.format(d);
    // Here we use Double.parseDouble() which should able to parse a number we know was
    // representable as a double into the original double. If parseDouble() is not implemented
    // correctly the test is invalid.
    double doubleParsed = Double.parseDouble(result);
    assertDoubleEqual(testId + " (format() produced " + result + ")", d, doubleParsed);
    // For completeness we try to parse using the formatter too. If this fails but the format
    // above didn't it may be a problem with parse(), or with format() that we didn't spot.
    assertDoubleEqual(testId + " failed parse(format()) check", d, format.parse(result).doubleValue());
}

Example 47 with DecimalFormat

use of java.text.DecimalFormat in project j2objc by google.

the class DecimalFormatTest method testMinimumFractionDigits_getAndSet.

public void testMinimumFractionDigits_getAndSet() {
    DecimalFormat form = (DecimalFormat) NumberFormat.getInstance(Locale.US);
    // getMinimumFractionDigits from NumberFormat (default to 0)
    // getMinimumFractionDigits from DecimalFormat (default to 0)
    assertEquals(0, form.getMinimumFractionDigits());
    form.setMinimumFractionDigits(310);
    assertEquals(310, form.getMinimumFractionDigits());
    // Deliberately > 340. The API docs mention 340 and suggest that you can set the value
    // higher but it will use 340 as a ceiling.
    form.setMinimumFractionDigits(500);
    assertEquals(500, form.getMinimumFractionDigits());
    form.setMaximumFractionDigits(400);
    assertEquals(400, form.getMinimumFractionDigits());
    form.setMinimumFractionDigits(-3);
    assertEquals(0, form.getMinimumFractionDigits());
}

Example 48 with DecimalFormat

use of java.text.DecimalFormat in project j2objc by google.

the class DecimalFormatTest method test_hashCode.

public void test_hashCode() {
    DecimalFormat df1 = new DecimalFormat();
    DecimalFormat df2 = (DecimalFormat) df1.clone();
    assertTrue("Hash codes of equals object are not equal", df2.hashCode() == df1.hashCode());
}

Example 49 with DecimalFormat

use of java.text.DecimalFormat in project j2objc by google.

the class DecimalFormatTest method test_setGroupingUsed.

public void test_setGroupingUsed() {
    DecimalFormat format = new DecimalFormat();
    StringBuffer buf = new StringBuffer();
    format.setGroupingUsed(false);
    format.format(new Long(1970), buf, new FieldPosition(0));
    assertEquals("1970", buf.toString());
    assertFalse(format.isGroupingUsed());
    format.format(new Long(1970), buf, new FieldPosition(0));
    assertEquals("19701970", buf.toString());
    assertFalse(format.isGroupingUsed());
    format.setGroupingUsed(true);
    format.format(new Long(1970), buf, new FieldPosition(0));
    assertEquals("197019701,970", buf.toString());
    assertTrue(format.isGroupingUsed());
}

Example 50 with DecimalFormat

use of java.text.DecimalFormat in project j2objc by google.

the class DecimalFormatTest method test_formatToCharacterIterator_veryLarge.

public void test_formatToCharacterIterator_veryLarge() throws Exception {
    AttributedCharacterIterator iterator;
    int[] runStarts;
    int[] runLimits;
    String result;
    char current;
    Number number = new BigDecimal("1.23456789E1234");
    assertEquals("1.23456789E+1234", number.toString());
    iterator = new DecimalFormat().formatToCharacterIterator(number);
    runStarts = new int[] { 0, 0, 2, 3, 3, 3, 6, 7, 7, 7, 10, 11, 11, 11, 14 };
    runLimits = new int[] { 2, 2, 3, 6, 6, 6, 7, 10, 10, 10, 11, 14, 14, 14, 15 };
    // 000,000,000,000....
    result = "12,345,678,900,";
    current = iterator.current();
    for (int i = 0; i < runStarts.length; i++) {
        assertEquals("wrong start @" + i, runStarts[i], iterator.getRunStart());
        assertEquals("wrong limit @" + i, runLimits[i], iterator.getRunLimit());
        assertEquals("wrong char @" + i, result.charAt(i), current);
        current = iterator.next();
    }
    assertEquals(0, iterator.getBeginIndex());
    assertEquals(1646, iterator.getEndIndex());
}