2018-2019-2 20175303 实验二 《Java开发环境的熟悉》实验报告
一、实验准备
1.了解掌握实验所要用到的三种代码
伪代码
产品代码
测试代码
2.IDEA中配置单元测试工具JUnit
进入IDEA,点击File->Setting
选择Plugins,点击Marketplace查找junit
选择JUnitGenerator V2.0,点击Install
二、实验内容
任务一
对MyUtil类进行测试,测试用例至少要包含正常情况,错误情况,边界情况的测试,提交都通过的截图,截图上要有画图加水印,输入自己的学号。
任务二:
以TDD的方式研究学习StringBuffer,提交单元测试用例和测试通过的截图,截图要加上学号水印。
任务三:
- 对设计模式示例进行扩充,体会OCP原则和DIP原则的应用。
- 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截图,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截图,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截图,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截图,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截图,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截图,加上学号水印 - 我学号为11,故任务: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截图,加上学号水印。
任务四:
以TDD的方式开发一个复数类Complex,要求如下:
// 定义属性并生成getter,setter
double RealPart;
double ImagePart;
// 定义构造函数
public Complex()
public Complex(double R,double I)
//Override Object
public boolean equals(Object obj)
public String toString()
// 定义公有方法:加减乘除
Complex ComplexAdd(Complex a)
Complex ComplexSub(Complex a)
Complex ComplexMulti(Complex a)
Complex ComplexDiv(Complex a)
任务五:
- 使用WhiteStarUML对实验二中的代码进行建模,发类图的截图,加上学号水印
- 类图中只少两个类
- 类,继承,接口实现,组合在UML中表达
三、实验代码及截图
任务一
伪代码:
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”
待测试代码:
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";
}
}
测试代码:
import org.junit.Test;
import junit.framework.TestCase;
public class MyUtilTest extends TestCase {
@Test
public void testNormal() {
assertEquals("不及格",MyUtil.percentage2fivegrade(55));
assertEquals("及格",MyUtil.percentage2fivegrade(65));
assertEquals("中等",MyUtil.percentage2fivegrade(75));
assertEquals("良好",MyUtil.percentage2fivegrade(85));
assertEquals("优秀",MyUtil.percentage2fivegrade(95));
}
@Test
public void testExceptions() {
assertEquals("错误",MyUtil.percentage2fivegrade(-80));
assertEquals("错误",MyUtil.percentage2fivegrade(125));
}
@Test
public void testBoundary() {
assertEquals("不及格",MyUtil.percentage2fivegrade(0));
assertEquals("及格",MyUtil.percentage2fivegrade(60));
assertEquals("中等",MyUtil.percentage2fivegrade(70));
assertEquals("良好",MyUtil.percentage2fivegrade(80));
assertEquals("优秀",MyUtil.percentage2fivegrade(90));
assertEquals("优秀",MyUtil.percentage2fivegrade(100));
}
}
任务二
以TDD的方式研究学习StringBuffer:
1.TDD的测试步骤如下:
•明确当前要完成的功能,记录成一个测试列表
•快速完成编写针对此功能的测试用例
•测试代码编译不通过(没产品代码呢)
•编写产品代码
•测试通过
•对代码进行重构,并保证测试通过(重构下次实验练习)
•循环完成所有功能的开发
老师给出的代码:
public class StringBufferDemo{
public static void main(String [] args){
StringBuffer buffer = new StringBuffer();
buffer.append('S');
buffer.append("tringBuffer");
System.out.println(buffer.charAt(1));
System.out.println(buffer.capacity());
System.out.println(buffer.indexOf("tring"));
System.out.println("buffer = " + buffer.toString());
}
}
测试代码
import org.junit.Assert;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;
public class StringBufferDemoTest {
StringBuffer str12 = new StringBuffer("hereare12chr");
StringBuffer str24 = new StringBuffer("Here are 24 characters!!");
StringBuffer str36 = new StringBuffer("Surprise!!! Here are 36 characters!!");
@Test
public void testcharAt(){
Assert.assertEquals('h', str12.charAt(0));
Assert.assertEquals('a', str24.charAt(5));
}
@Rule
public ExpectedException thrown= ExpectedException.none();
@Test
public void testcharAtException(){
thrown.expect(StringIndexOutOfBoundsException.class);
str36.charAt(40);
}
@Test
public void testlength(){
Assert.assertEquals(12, str12.length());
Assert.assertEquals(24, str24.length());
Assert.assertEquals(36, str36.length());
}
@Test
public void testcapacity(){
Assert.assertEquals(28, str12.capacity());
Assert.assertEquals(40, str24.capacity());
Assert.assertEquals(52, str36.capacity());
Assert.assertEquals(82,str24.append("here are 22 characters").capacity());
}
@Test
public void testindex(){
Assert.assertEquals(4, str12.indexOf("a"));
Assert.assertEquals(9, str24.indexOf("24"));
Assert.assertEquals(-1, str36.indexOf("?"));
}
}
任务三
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截图,加上学号水印
任务四
以TDD的方式开发一个复数类Complex
-
在Complex类中设置构造方法public myComplex(double R,double I),设置实部与虚部
-
实现加法myComplex ComplexAdd(myComplex a)
-
实现减法myComplex ComplexSub(myComplex a)
-
实现乘法myComplex ComplexMulti(myComplex a)
-
实现除法myComplex ComplexDiv(myComplex a)
-
重写equals()方法和toString()方法
待测试代码:
public class myComplex {
// 定义属性并生成getter,setter
double RealPart;
double ImagePart;
// 定义构造函数
myComplex(double R,double I){
RealPart=R;
ImagePart=I;
}
// 定义公有方法:加减乘除
myComplex ComplexAdd(myComplex a){
return new myComplex(RealPart+a.RealPart,ImagePart+a.ImagePart);
}
myComplex ComplexSub(myComplex a){
return new myComplex(RealPart-a.RealPart,ImagePart-a.ImagePart);
}
myComplex ComplexMulti(myComplex a){
return new myComplex(RealPart*a.RealPart-ImagePart*a.ImagePart,RealPart*a.ImagePart+a.RealPart*ImagePart);
}
myComplex ComplexDiv(myComplex a){
return new myComplex((RealPart*a.RealPart+ImagePart*a.ImagePart)/(a.RealPart*a.RealPart+a.ImagePart*a.ImagePart),(-RealPart*a.ImagePart+a.RealPart*ImagePart)/(a.RealPart*a.RealPart+a.ImagePart*a.ImagePart));
}
//Override Object
public boolean equals(Object obj){
if(obj==null)
return false;
else {
myComplex m = (myComplex) obj;
if (m.RealPart == RealPart && m.ImagePart == ImagePart)
return true;
else return false;
}
}
public String toString(){
String output;
if(ImagePart==0){
return output=RealPart+"";
}
else if(RealPart==0 && ImagePart!=0){
return output=ImagePart+"i";
}
else if(ImagePart>0) {
return output=RealPart+"+"+ImagePart+"i";
}
else return output=RealPart+""+ImagePart+"i";
}
}
测试代码:
import junit.framework.TestCase;
import org.junit.Test;
public class myComplexTest extends TestCase {
myComplex a = new myComplex(6,2);
myComplex b = new myComplex(5,1);
myComplex c = new myComplex(4,-2);
myComplex d = new myComplex(3,1);
myComplex e = new myComplex(6,2);
//myComplex e = new myComplex(2,4);
@Test
public void testEquals() {
assertEquals(false,a.equals(b));
assertEquals(true,a.equals(e));
}
@Test
public void testComplexAdd() throws Exception {
assertEquals("11.0+3.0i",b.ComplexAdd(a).toString());
assertEquals("10.0",a.ComplexAdd(c).toString());
assertEquals("9.0-1.0i",b.ComplexAdd(c).toString());
}
@Test
public void testComplexSub() {
assertEquals("-1.0-1.0i",b.ComplexSub(a).toString());
assertEquals("2.0+4.0i",a.ComplexSub(c).toString());
assertEquals("2.0",b.ComplexSub(d).toString());
}
@Test
public void testComplexMulti() {
assertEquals("28.0+16.0i",b.ComplexMulti(a).toString());
assertEquals("28.0-4.0i",a.ComplexMulti(c).toString());
assertEquals("14.0+8.0i",b.ComplexMulti(d).toString());
}
@Test
public void testComplexDiv() {
assertEquals("2.0",a.ComplexDiv(d).toString());
assertEquals("1.0+1.0i",a.ComplexDiv(c).toString());
}
}