alonWang

sed -i "s/old/new/" `find . -name '*.txt'`

alonWang

package main

import "fmt"

type BinaryTree struct {
	head *node
}

func NewBinaryTree(value int) BinaryTree {
	return BinaryTree{&node{val: value}}

alonWang

public class MapUtil {
	/**
	 * 如果map中存在key,将其转化后进行处理
	 * 
	 * @param map
	 * @param key
	 * @param mapper
	 * @param consumer
	 * @param <K>
	 * @param <V>

alonWang

AopUtils.getTargetClass

alonWang

package com.company;

import java.util.Arrays;

public class QuickSort {
    public static void sort(Integer[] arrays, int low, int high) {
        if (high <= low) {
            return;
        }
        int parationIdx = paration(arrays, low, high);

alonWang

/**
 * 将一维数组看做一颗二叉树 父节点和子节点的关系为 Nk~=N2k+1,N2k+2
 * 1. 构建堆
 * 2. 调整堆
 */
public class HeapSort {
    public static void main(String[] args) {
        int[] arr = new int[]{1, 5, 4, 65, 3};
        heapSort(arr);
        for (int n : arr) {

alonWang

/**
 * @description: 参考了 https://www.jianshu.com/p/da312eee4ac4
 * @author: alonwang
 * @create: 2019-07-19 15:54
 **/
public class SpuriousWakeUp {
    private final Object lock = new Object();
    private int product = 0;
		//如果没有产品,在lock对象上等待唤醒,如果有产品,消费.
    private Runnable consumer = () -> {

alonWang

package com.github.alonwang.util;

import com.google.common.collect.Range;

import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.ZoneId;

/**

alonWang

    public static int numberOfLeadingZeros(int i) {
        // HD, Count leading 0's
        if (i <= 0)
            return i == 0 ? 32 : 0;
        int n = 31;
        if (i >= 1 << 16) { n -= 16; i >>>= 16; }
        if (i >= 1 <<  8) { n -=  8; i >>>=  8; }
        if (i >= 1 <<  4) { n -=  4; i >>>=  4; }
        if (i >= 1 <<  2) { n -=  2; i >>>=  2; }
        return n - (i >>> 1);

alonWang

package main

/*
简单的词法分析器演示
number: [0-9]+
identifier: [a-zA-Z_]
*/
/*
0 start
1 identifer