easy-util

some easy util class to operate data in java

APIS

BeanConverter

static <T> T convert(Map<String, ?> map, Class<T> tClass)

DateUtil

static Date add(Date date, int unit, int count)

static Integer between(Date date1, Date date2)

Functions

interface VoidFuncNoArg

GenericUtil

static <T> T[] getArray(Class<T> componentType, int length)

MathUtil

static double mean(double[] array)

static double sum(double[] array)

static double variance(double[] array)

static double standardDeviation(double[] array)

static double round(double v, int num)

ProxyUtil

public static <T, TAspect> Class<? extends T> proxyClass(Class<T> clazz, Class<TAspect> aspectClass)

RandomUtil

static int randomInt(int min, int max)

RangeUtil

static int[] index(int from, int to)

static double[] slice(double[] v, int from, Integer to)

static <T> T[] slice(T[] v, int from, T[] res)

static void set(double[] dest, double[] source, int from)

static void set(Object[] dest, double[] source, int from)

static String[] repeat(String str, int num)

static <T> T[] merge(T[] v1, T[] v2, T[] out)

static double[] unwrap(Double[] v)

static int[] unwrap(Integer[] v)

static Double[] wrap(double[] v)

static Integer[] wrap(int[] v)

static <T> int[] sortToIndex(T[] v, T[] out)

static <T> int[] sortToIndex(T[] v)

static double[] multiply(double[] v1, Object v2)

static double[] multiply(int[] v1, Object v2)

static double[] add(double[] data, Number num)

static int[] add(int[] data, Number num)

static int sum(int[] data)

static double sum(double[] data)

static double[] toDoubleArray(int[] v)

static <T> void shuffle(T[] v, T[] vShuffle)

static <T> T[] random(T[] v, T[] res)

static <T> T[] randomNotRepeat(T[] v, int num, T[] res, int[] index)

static int random(int low, int high)

static <T> T[] reindex(T[] v, int[] index, T[] out)

static <T> List<T> merge(List<T> l1, List<T> l2)

static <T> List<T> random(List<T> l, int length)

static <T> List<T> randomNotRepeat(List<T> l, int length, int[] indexes)

static double[] sliceNBefore(double[] data, int i, int n)

static double[] sliceNAfter(double[] data, int i, int n)

static int[] sliceNBefore(int[] data, int i, int n)

static int[] sliceNAfter(int[] data, int i, int n)

static List<Integer> toBoxedList(int[] array)

static List<Double> toBoxedList(double[] array)

Retry

public static boolean run(Supplier<Boolean> func, Integer times, Consumer<Exception> errCallback)

Streams

interface Function<T1, T2, R>

interface Consumer<T1, T2>

static <T> void forEachIndexed(Stream<T> stream, Consumer<T, Long> consumer)

static <T> void forEachIndexedParallel(Stream<T> stream, Consumer<T, Long> consumer)

static <T> void forEachIndexedWithBreak(Stream<T> stream, Function<T, Long, Boolean> function)

static <T, R> Stream<R> mapWithIndex(Stream<T> stream, Function<T, Long, R> function)

static <T, R> Stream<R> mapWithIndexParallel(Stream<T> stream, Function<T, Long, R> function)

static <T> Optional<T> find(Stream<T> stream, Predicate<T> function)

Tuple, Triple