Here is why you should use compareTo to find out whether two BigDecimals represent the same number or not.

import java.math.BigDecimal;

import junit.framework.TestCase;

public final class TestBigDecimal extends TestCase {
    public void testBigDecimalZeroEqualsBigDecimalValueOfZero() {
        assertTrue(BigDecimal.ZERO.equals(BigDecimal.valueOf(0)));
    }

    public void testBigDecimalZeroNotEqualsBigDecimalValueOfZeroDot() {
        assertFalse(BigDecimal.ZERO.equals(BigDecimal.valueOf(0.)));
    }

    public void testBigDecimalZeroEqualsBigDecimalValueOfZeroString() {
        assertTrue(BigDecimal.ZERO.equals(new BigDecimal("0")));
    }

    public void testBigDecimalZeroEqualsBigDecimalValueOfZeroDotString() {
        assertTrue(BigDecimal.ZERO.equals(new BigDecimal("0.")));
    }

    public void testBigDecimalZeroNotEqualsBigDecimalValueOfZeroDotZeroString() {
        assertFalse(BigDecimal.ZERO.equals(new BigDecimal("0.0")));
    }

    public void testBigDecimalZeroComparesToBigDecimalValueOfZeroDotAsZero() {
        assertEquals(0, BigDecimal.ZERO.compareTo(BigDecimal.valueOf(0.)));
    }

    public void testBigDecimalZeroComparesToBigDecimalValueOfZeroDotZeroStringAsZero() {
        assertEquals(0, BigDecimal.ZERO.compareTo(new BigDecimal("0.0")));
    }
}

This entry was posted on Saturday, March 6th, 2010 at 5:00 pm and is filed under Something for the week end. You can follow any responses to this entry through the RSS 2.0 feed. You can skip to the end and leave a response. Pinging is currently not allowed.