20165229 Experiment Report of Java object-oriented programming

Experiment Report of Java object-oriented programming

• Initial mastery of UML modeling
• Familiarity with S.O.L.I.D principles

• Initial mastery of UML modeling

• Understanding Design Patterns

  Lab Submission point 1:

Unit Test

(1) Three kinds of code

伪代码It is an algorithm description language, with clear structure, simple code, good readability and similar natural language, do not rigidly adhere to the specific implementation

• Pseudo code

百分制转五分制：   如果成绩小于60，转成“不及格”   如果成绩在60与70之间，转成“及格”   如果成绩在70与80之间，转成“中等”   如果成绩在80与90之间，转成“良好”   如果成绩在90与100之间，转成“优秀”   其他，转成“错误“

• Experiment Code

public class MyUtil{    public static String percentage2fivegrade(int grade){        //如果成绩小于0，转成“错误”        if ((grade < 0))            return "错误";            //如果成绩小于60，转成“不及格”        else if (grade < 60)            return "不及格";            //如果成绩在60与70之间，转成“及格”        else if (grade < 70)            return "及格";            //如果成绩在70与80之间，转成“中等”        else if (grade < 80)            return "中等";            //如果成绩在80与90之间，转成“良好”        else if (grade < 90)            return "良好";            //如果成绩在90与100之间，转成“优秀”        else if (grade <= 100)            return "优秀";            //如果成绩大于100，转成“错误”        else            return "错误";    }}

Write the product code, we also have to write the test code, to prove that their code is not a problem.

• Test code

Import Org.junit.test;import Junit.framework.testcase;public class Myutiltest extends TestCase {@Test public void t        Estnormal () {assertequals ("failed", Myutil.percentage2fivegrade (55));        Assertequals ("Pass", Myutil.percentage2fivegrade (65));        Assertequals ("Medium", Myutil.percentage2fivegrade (75));        Assertequals ("Good", Myutil.percentage2fivegrade (85));    Assertequals ("excellent", Myutil.percentage2fivegrade (95));        } @Test public void Testexceptions () {assertequals ("error", Myutil.percentage2fivegrade (105));    Assertequals ("Error", Myutil.percentage2fivegrade (-55));        } @Test public void Testboundary () {assertequals ("failed", Myutil.percentage2fivegrade (0));        Assertequals ("Pass", Myutil.percentage2fivegrade (60));        Assertequals ("Medium", Myutil.percentage2fivegrade (70));        Assertequals ("Good", Myutil.percentage2fivegrade (80));        Assertequals ("excellent", Myutil.percentage2fivegrade (90)); Assertequals ("excellent", MYUTIL.PERCENTAGE2FIVEgrade (100)); }}

Experiment Two

TDD (test driven devlopment, testing-driven development)
The general steps for TDD are as follows:

Clear the current functionality to be completed and record it as a test list

Quick completion of writing test cases for this feature

Test code compilation does not pass (no product code)

Write the Product Code

Test Pass

Refactor the code and ensure the test passes (refactoring the next lab session)

Cycle through the development of all functions

Study StringBuffer in the way of TDD

Based on the code given by the teacher, the application of JUnit is performed.

• Product Code

  public class StringBufferDemo{private StringBuffer buffer = new StringBuffer();public StringBufferDemo(StringBuffer buffer){    this.buffer = buffer;}public Character charAt(int i){    return buffer.charAt(i);}public int capacity(){    return buffer.capacity();}public int length(){    return buffer.length();}public int indexOf(String buf) {    return buffer.indexOf(buf);}}

• Test code

import junit.framework.TestCase;import org.junit.Test;public class ComplexTest extends TestCase {    Complex a = new Complex( 0,3);    Complex b= new Complex( -1,-1);    @Test    public void testComplexAdd () throws Exception {        assertEquals( "-1.0+2.0i",a.ComplexAdd(b).toString());    }    @Test            public void testComplexSub () throws Exception{        assertEquals( "1.0+4.0i",a.ComplexSub(b).toString());    }    @Test    public void testComplexMulti () throws Exception {        assertEquals( "3.0 -3.0i",a.ComplexMulti(b).toString());    }    @Test    public void testComplexDiv () throws Exception {        assertEquals( "-1.5 -1.5i",a.ComplexDiv(b).toString());    }    }

Experiment Three

用自己的学号%6进行取余运算，根据结果进行代码扩充：0:让系统支持Byte类，并在MyDoc类中添加测试代码表明添加正确，提交测试代码和运行结的，加上学号水印1:让系统支持Short类，并在MyDoc类中添加测试代码表明添加正确，提交测试代码和运行结的，加上学号水印2:让系统支持Boolean类，并在MyDoc类中添加测试代码表明添加正确，提交测试代码和运行结的，加上学号水印3:让系统支持Long类，并在MyDoc类中添加测试代码表明添加正确，提交测试代码和运行结的，加上学号水印4:让系统支持Float类，并在MyDoc类中添加测试代码表明添加正确，提交测试代码和运行结的，加上学号水印5:让系统支持Double类，并在MyDoc类中添加测试代码表明添加正确，提交测试代码和运行结的，加上学号水印

I am the 5th question:
The experimental code allows the system to support the double class and add the test code to the MyDoc class to indicate that the correct

Abstract class Data {abstract public void displayvalue ();}    Class Integer extends Data {int value;    Integer () {value = 100;    } @Override public void Displayvalue () {System.out.println (value);    }}class Double extends Data {double value;    Double () {value = 82.8;    } @Override public void Displayvalue () {System.out.println (value); }}abstract class Factory {abstract public Data createdataobject ();}    Class Intfactory extends Factory {public Data createdataobject () {return new Integer (); }} class Doublefactory extends Factory {public Data createdataobject () {return new Doub            Le ();            }} class Document {Data pd; Document (Factory pf) {PD = PF.            CreateDataObject (); } public void Displaydata () {PD.            Displayvalue (); }} public class MyDoc {static DocumEnt d, E;                public static void Main (string[] args) {d = new Document (new Doublefactory ());                E = new Document (new Intfactory ());                E.displaydata ();            D.displaydata (); }        }

Experiment Four

Submit: Unit test code and run success and code on the cloud Codes link, to add the number watermark

Task: Develop a plural class complex in TDD mode.

• Experiment Code

 public class Complex {private Double R; private double I; Public Complex (Double R, double i) {THIS.R = R; THIS.I = i; } public static Double Getrealpart (double R) {return r; } public static double Getimagepart (double i) {return i; } public Complex Complexadd (Complex c) {return new Complex (R + C.R, i + CI); } public Complex Complexsub (Complex c) {return new Complex (R-C.R, I-C.I); } public Complex Complexmulti (Complex c) {return new Complex (R * c.r-i * C.I., R * C.I. + i * C.R); } public Complex Complexdiv (Complex c) {return new Complex ((R * C.I. + i * C.R)/(CI-C.I. + C.R * c.r), (i * CI + R * c.r)/(CI * C.I. + C.R * c.r)); The public String toString () {string s = ""; if (i > 0) s = r + "+" + i + "I"; if (i = = 0) s = r + ""; if (I < 0) s = r + "" + i + "I"; return s; }}

• Test code

import junit.framework.TestCase;import org.junit.Test;public class ComplexTest extends TestCase {    Complex a = new Complex( 0,3);    Complex b= new Complex( -1,-1);    @Test    public void testComplexAdd () throws Exception {        assertEquals( "-1.0+2.0i",a.ComplexAdd(b).toString());    }    @Test            public void testComplexSub () throws Exception{        assertEquals( "1.0+4.0i",a.ComplexSub(b).toString());    }    @Test    public void testComplexMulti () throws Exception {        assertEquals( "3.0 -3.0i",a.ComplexMulti(b).toString());    }    @Test    public void testComplexDiv () throws Exception {        assertEquals( "-1.5 -1.5i",a.ComplexDiv(b).toString());    }    }

Experiment Five

Using STARUML to model the code in experiment two

Experiment Summary and experience

The experiment I felt the difficulty of learning Java, because the use of Mac computers, some of the steps and the teacher gave the tutorial is not the same, through their own tutorial step by step to complete the experiment, feeling very fulfilling. In this experiment I learned about three different 伪代码 产品代码 测试代码 kinds of differences and learned to use Juint test code in idea.

20165229 Experiment Report of Java object-oriented programming