Java Code Examples for java.util.ArrayList#getClass()
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java.util.ArrayList#getClass() .
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Example 1
Source File: ArrayListBaseTest.java From jdk-source-analysis with Apache License 2.0 | 6 votes |
/** * 通过反射查看 {@link ArrayList} 的内部属性 */ public void xray(ArrayList list) { Class clazz = list.getClass(); try { Field elementData = clazz.getDeclaredField("elementData"); elementData.setAccessible(true); Object[] objects = (Object[]) elementData.get(list); Field sizeField = clazz.getDeclaredField("size"); sizeField.setAccessible(true); int size = 0; for (int i = 0; i < objects.length; i++) { if (Objects.nonNull(objects[i])) { ++size; } } System.out.println("length = " + objects.length + ", size = " + sizeField.get(list) + ", arraySize = " + size); } catch (Throwable e) { e.printStackTrace(); } }