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1. java的类加载器 ——java虚拟机自带的类加载器 根类加载器（Bootstrap）c++实现 扩展类加载器（Extension）java实现 系统类加载器（System）java实现 ——用户自定义加载器 java.lang.ClassLoader的子类 用户可以定制类的加载方式 2. 类 阅读全文
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Given a nested list of integers represented as a string, implement a parser to deserialize it. Each element is either an integer, or a list -- whose e 阅读全文
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There are n bulbs that are initially off. You first turn on all the bulbs. Then, you turn off every second bulb. On the third round, you toggle every 阅读全文
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Given a positive integer n, break it into the sum of at least two positive integers and maximize the product of those integers. Return the maximum pro 阅读全文
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Given a positive integer n and you can do operations as follow: What is the minimum number of replacements needed for n to become 1? Example 1: Exampl 阅读全文
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Given a string, find the length of the longest substring without repeating characters. Examples: Given "abcabcbb", the answer is "abc", which the leng 阅读全文
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Given a non-empty string containing an out-of-order English representation of digits 0-9, output the digits in ascending order. Note: Example 1: Examp 阅读全文
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You have a total of n coins that you want to form in a staircase shape, where every k-th row must have exactly k coins. Given n, find the total number 阅读全文
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Write a program to find the nth super ugly number. Super ugly numbers are positive numbers whose all prime factors are in the given prime list primes 阅读全文
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1. java中的修饰符 a. 权限修饰符 private，默认的，protected，public b. 状态修饰符 static，final c. 抽象修饰符 abstract 2. 类修饰符 public（访问控制符），将一个类声明为公共类，他可以被任何对象访问，一个程序的主类必须是公共类，一 阅读全文