List of usage examples for org.jfree.data.xy XIntervalSeries isEmpty
public boolean isEmpty()
true
if the series contains no data items, and false
otherwise. From source file:org.jfree.data.xy.XIntervalSeriesTest.java
/** * Some checks for the clear() method./*from w w w. j a v a2s . c o m*/ */ @Test public void testClear() { XIntervalSeries s1 = new XIntervalSeries("S1"); s1.addChangeListener(this); s1.clear(); assertNull(this.lastEvent); assertTrue(s1.isEmpty()); s1.add(1.0, 2.0, 3.0, 4.0); assertFalse(s1.isEmpty()); s1.clear(); assertNotNull(this.lastEvent); assertTrue(s1.isEmpty()); }