Java

The method is obtained by reflection: Method keyword Meaning Getdeclaredmethods() Get all the methods Getreturntype() Get the return type of the method

Packagetestsynchronized;/*** * When using this, the TestClass object in the file as the object lock, * Two threads use the object lock to access the object's synchronization code block, * is executed sequentially, * that is, when a thread uses the

So far it has been clear that the basic processing of the exception, but two problems left: finally useless, throw useless, then in order to better explain the meaning of the two operations, give a standard structure of exception handling.Example:

Title:Given a binary tree, find its minimum depth.The minimum depth is the number of nodes along, the shortest path from the root node to the nearest leaf node.Test Instructions:Given a binary tree, return its minimum height.The minimum height

Title:Given a binary tree, determine if it is a valid binary search tree (BST).Assume a BST is defined as follows: The left subtree of a node contains only nodes with keys less than the node ' s key. The right subtree of a node contains

Title:Given a binary tree, check whether it is a mirror of the itself (ie, symmetric around its center).For example, this binary tree is symmetric: 1 / 2 2/\/3 4 4 3But the following are not: 1 / 2 2 \ 3 3Test

1 Configuring Environment variablesUse the mouse to right-click My Computer, properties, advanced environment variablesnew variable name, System variable: Java_home variable Value: C:\Program Files (x86) \java\jdk1.8.0_11Variable name: CLASSPATH

Title:Given a binary tree and a sum, determine if the tree has a root-to-leaf path such this adding up all the values along the Path equals the given sum.For Example:Given The below binary tree sum = 22 and , 5 /

Reprint please specify the source http://blog.csdn.net/l1028386804/article/details/46970705A snippet of code from Google Maps's script will probably be used. Let's see how it all counts.Private static final Double Earth_radius = 6378.137;private

Interaction between java and js in webview, and webviewjavajs WebView provides powerful functions for displaying web pages in Android applications. It is also the basis for the vigorous development of the Hybird app. As a very important component of

Some easy-to-Forget knowledge points in android and Forgotten knowledge points in android 1, setCompoundDrawables (Drawable left, Drawable top, Drawable right, Drawable bottom) Set the orientation of the image to appear in textView, button, and

The BaseServlet and javabaseservlet of the post (get) parameters are mapped using the reflection mechanism of java classes. Over the past few days, I have been studying the reflection mechanism of java. I just need to write servlet for the job. To

Java annotation + reflection Application Record, javaannotation A small example of annotation and reflection in java is recorded for reference, The configuration page allows you to dynamically select a class that implements the Check interface, save

Java concurrent programming practice (using synchronized for synchronization)This article introduces the most basic synchronization method in java, that is, using the synchronized keyword to control concurrent access to a method. If an object has

Design Pattern _ template method patternTemplate Method PatternDefine the skeleton of an algorithm in an operation, defering some steps to subclasses. Template Method lets subclasses redefine certain steps of an algorithm without changing the

[LeetCode] [Java] Scramble StringQuestion:   Given a string s1, we may represent it as a binary tree by partitioning it to two non-empty substrings recursively. Below is one possible representation of s1 =great: great / gr eat / /

[LeetCode] [Java] Merge Sorted ArrayQuestion:   Given two sorted integer arrays nums1 and nums2, merge nums2 into nums1 as one sorted array. Note:You may assume that nums1 has enough space (size that is greater or equal to m + n) to hold additional

Custom struts Framework (excluding interceptor implementation) First, it is clear that all requests sent are intercepted by the filter. The specific implementation steps are as follows: 1. Customize a MyAction interface. The subsequent Action

Command mode in Design Mode Four roles: Receiver: The command is finally passed here to execute the command, but multiple commands can be executed. Command: Has a pointer to the worker er. You need to execute a Command Invoker: Record and trigger

Java Memory leakage test Package com. ckw. mianshi;/*** test memory leakage * several events that cause memory leakage in java: * 1. the reference of objects held in containers such as HashMap and Verctor. Although the object has been set to null,