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What java needs to learn today is: 1. Junit unit test 2. reflection 3. notes Junit unit test: Test classification: Black box test: no need to write code, give input value, see whether the program can output the expected value. White box test: need to write code. Pay attention to the specifi ...

options{ STATIC=false; LEXER_CLASS="ExpCalcParserTokenManager"; } PARSER_BEGIN(ExpCalcParser) import java.io.*; import java.io.PrintStream; import java.math.BigDecimal; public class ExpCalcParser{ private static final int DEF_DIV_SCALE = 16;//Result precision set to 16 bits private String exp; public static ExpCalcPars ...

Summary Title Description There is a grid of m rows and n columns on the ground. A robot starts to move from the grid of coordinates 0,0. Each time, it can only move one grid to the left, right, up and down directions, but it can't enter the grid where the sum of the row coordinates and the column coordinates is greater than k ...

  Catalog Python Basics install install Basic use print function Basic mathematical operation variable while and for loops while cycle for cycle if judgement if judgement if else judgment if elif else judgment Defining function def function Function parameter Function default parameters Variable form ...

This chapter is a continuation of the previous chapter. This chapter is mainly about regression problem. It designs a "salary increase calculator", which is a salary increase algorithm. Here is still the data. First, let's make a histogram of the requirements and results of the salary raiser: import pandas as pd imp ...

1. Preface Every application with ideal UWP will make the idea of title block, especially when Microsoft provides Extend Acrylic to the title block After this function, most of Windows 10's native applications are not obedient, occupying one mu and three Fen of the title bar. This blog will show you how to customize the title block in UWP. 2. ...

Based on Express, Mocha + Istanbul 1. Unit Test 1.1 Install Mocha npm i -D mocha 1.2 Create test/test.js var assert = require('assert'); describe('Array', function() { describe('#indexOf()', function() { it('should return -1 when the value is not present', function() { assert.equal([1,2,3].indexOf(4), -1); }) ...

A calculator based on TCP communication, the client sends data to the server through the button, the server calculates and processes the data, and sends the calculation result back to the client. It uses multithreading to enable. Server thread: package com.netproject2; import java.io.DataInputStream; import java.io.DataOutputStr ...

Abbreviation and event modifier for v-on of Vue instruction event modifier:. stop prevents bubbling. prevent block default events. capture use event capture mode when adding event listeners. self triggers the callback only when the event is triggered by the element itself (for example, not a child element). once event is triggered only once v- ...

introduce Role: It mainly includes the following roles: Expression: abstract expression. TerminalExpression: Terminator expression - is a symbolic expression. NonTerminalExpression: non terminator expression - numeric expression. Calculator: calculation class. Code Code scenario Interpreter to add and subtract. Specific code Expression /** * ...