vincentruan

public class JavaTypeUtils {

    private static final TypeFactory TYPE_FACTORY = TypeFactory.defaultInstance();

    public static JavaType listTypeOf(Class<?> parameterClass) {
        return TYPE_FACTORY.constructCollectionType(List.class, parameterClass);
    }

    public static JavaType simpleTypeOf(Class<?> parameterClass) {
        return TYPE_FACTORY.constructType(parameterClass);

vincentruan

JAVA API

1. java.lang.Math

Math 类中的 random 方法返回一个 [0.0, 1.0) 区间的 double 值。下面这段代码能得到一个 min 和 max 之间的随机数：

int randomWithMathRandom = (int) ((Math.random() * (max - min)) + min);

2. java.util.Random

vincentruan

• Multimap 一个key可以映射多个value的HashMap

Multimap<String, Integer> map = ArrayListMultimap.create();
map.put("key", 1);
map.put("key", 2);
Collection<Integer> values = map.get("key");
System.out.println(map); // 输出 {"key":[1,2]}
// 还能返回你以前使用的臃肿的Map
Map<String, Collection<Integer>> collectionMap = map.asMap();
// 优雅替换Map<String, List>

vincentruan

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