小代码合集

最新推荐文章于 2021-12-20 19:44:03 发布

anyof112

最新推荐文章于 2021-12-20 19:44:03 发布

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分类专栏： java 文章标签： java

本文链接：https://blog.youkuaiyun.com/anyof112/article/details/84020396

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本文介绍了如何在Java中将数组转换为ArrayList以及如何将ArrayList转换回数组的方法。此外，还提供了一个Java实用工具类BeanUtils，用于获取和设置对象字段值。

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[quote]
数组转Arraylist
[/quote]


private static String[] items={"lorem", "ipsum", "dolor","sit", "amet", "consectetuer","adipiscing", "elit", "morbi","vel", "ligula", "vitae","arcu", "aliquet", "mollis","etiam", "vel", "erat","placerat", "ante","porttitor", "sodales","pellentesque", "augue","purus"}; 

ArrayList<String> itemStrs=new ArrayList(Arrays.asList(items));

[quote]
ArrayList转数组
[/quote]


	ArrayList<String> list=new ArrayList<String>();
		for(int i=0;i<5;i++){
			list.add("Number :"+(i+10));
		}
		String[] con=new String[list.size()];
		con=(String[]) list.toArray(new String[list.size()]);

[quote]
Java IOC
[/quote]


public class BeanUtils {

	private BeanUtils() {

	}

	public static Object getFiledValue(final Object object,
			final String fieldName){
		Field field=getDeclaredField(object,fieldName);
		if(field==null){
			throw new IllegalArgumentException("Could not find field["+fieldName+"] on target [ "+object+" ]");
		}
		makeAccessible(field);
		try {
			return field.get(object);
		} catch (IllegalArgumentException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IllegalAccessException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return null;
	}

	public static void setFieldValue(final Object object,
			final String fieldName, final Object value) {

		Field field = getDeclaredField(object, fieldName);

		if (field == null)
			throw new IllegalArgumentException("Could not find field ["
					+ fieldName + "] on target [" + object + "]");
		makeAccessible(field);
		try {
			field.set(object, value);
		} catch (IllegalAccessException e) {

		}
	}

	protected static Field getDeclaredField(final Object object,
			final String fieldName) {

		return getDeclaredField(object.getClass(), fieldName);

	}

	protected static Field getDeclaredField(final Class clazz,
			final String fieldName) {

		for (Class superClass = clazz; superClass != Object.class; superClass = superClass
				.getSuperclass()) {

			try {

				return superClass.getDeclaredField(fieldName);

			} catch (NoSuchFieldException e) {

			}
		}
		return null;
	}

	protected static void makeAccessible(Field field) {
		if (!Modifier.isPublic(field.getModifiers())
				|| !Modifier.isPublic(field.getDeclaringClass().getModifiers())) {
			field.setAccessible(true);
		}
	}
}