liujihaozhy的专栏

Integer[] arr = {1,2,3}; int a = 2; System.out.println(Arrays.asList(arr).contains(a));第二种方案：采用定义list方案 ArrayList<Integer> channelArray = new ArrayList<>(); channelArray.add(1); channelArray...

1，状态机2，jpa jdbctemplate3，aop4，切面5，注解6，rpc7，jbdc

/* * 将时间转换为时间戳 */public static Long dateToStamp(String s) throws ParseException { Long res; SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); Date date = simpleDateFormat.parse(s); long ts = date.getTime().

package com.zhuanzhuan.zzb2c.zljmsg.util;import java.math.BigDecimal;/** * 用于高精确处理常用的数学运算 */public class ArithmeticUtils { //默认除法运算精度 private static final int DEF_DIV_SCALE = 10; /** * 提供精确的加法运算 * * @param v1 被加数 * .

int -> string int a = 1; String b = String.valueOf(a); System.out.println(b);

collect3.forEach((key, value) -> { System.out.println(key); Field[] declaredFields = value.getClass().getDeclaredFields(); System.out.println(declaredFields); for (Field f: declaredFields) { ...

collect3.forEach((key, value) -> { System.out.println(key); });

》原创地址1、判断对象是否存在于list集合中用list的contains方法，即list.contains(object)，返回的是boolean值。2、去掉list集合中重复的元素方法一：循环元素删除public static void removeDuplicate(List list) { for ( int i = 0 i < list.size() - 1 i ++ ) { for ( int j = lis

list 泛型 @Test public void test() { ArrayList<Object> li = new ArrayList<>(); li.add(1); li.add("sss"); System.out.println(li.get(0)); }