20165301实验二java面向对象程序设计
20165301实验二java面向对象程序设计
实验目的与要求（提交点一）：
- 参考http://www.cnblogs.com/rocedu/p/6371315.html#SECUNITTEST完成单元测试的学习
- 提交最后三个JUnit测试用例（正常情况，错误情况，边界情况）都通过的截图，截图上要有画图加水印，输入自己的学号
- 测试用例至少要包含正常情况，错误情况，边界情况的测试
实验内容及结果截图
- 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”
- 实验代码
public class MyUtil {
public static String percentage2fivegrade(int grade) {
if(grade<0)
return "错误";
else if(grade<60)
return "不及格";
else if(grade<70)
return "及格";
else if(grade<80)
return "中等";
else if(grade<90)
return "良好";
else if(grade<=100)
return "优秀";
else
return "错误";
}
}
- 单元测试用例
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(105));
assertEquals("错误", MyUtil.percentage2fivegrade(-55));
}
@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));
}
}
- 运行截图
实验目的与要求（提交点二）：
- 参考 积极主动敲代码，使用JUnit学习Java
- 以 TDD的方式研究学习StringBuffer
提交你的单元测试用例和测试通过的截图，截图要加上学号水印
实验内容及结果截图
- 实验代码
public class StringBufferDemo {
public static void main(String [] args){
StringBuffer buffer = new StringBuffer(20);
buffer.append('S');
buffer.append("tringBuffer");
// System.out.println(buffer.charAt(1));
System.out.println(buffer.capacity());
// System.out.println(buffer.indexOf("tring12345"));
System.out.println("buffer = " + buffer.toString());
System.out.println(buffer.length());
}
}
- 测试用例
public class StringBufferDemoTest extends TestCase {
StringBuffer a = new StringBuffer("StringBuffer");//测试12个字符（<=16）
StringBuffer b = new StringBuffer("StringBufferStringBuffer");//测试24个字符（>16&&<=34）
StringBuffer c = new StringBuffer("StringBufferStringBufferStringBuffer");//测试36个字符（>=34）
@Test
public void testcharAt() throws Exception{
assertEquals('S',a.charAt(0));
assertEquals('g',a.charAt(5));
assertEquals('r',a.charAt(11));
}
@Test
public void testcapacity() throws Exception{
assertEquals(28,a.capacity());
assertEquals(40,b.capacity());
assertEquals(52,c.capacity());
}
@Test
public void testlength() throws Exception{
assertEquals(12,a.length());
assertEquals(24,b.length());
assertEquals(36,c.length());
}
@Test
public void testindexOf() throws Exception{
assertEquals(0,a.indexOf("Str"));
assertEquals(5,a.indexOf("gBu"));
assertEquals(10,a.indexOf("er"));
}
}
- 运行截图
实验要求（提交点三）：
- 参考http://www.cnblogs.com/rocedu/p/6736847.html对设计模式示例进行扩充，体会OCP原则和DIP原则的应用，初步理解设计模式
- 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
实验内容及结果截图
- 实验代码
abstract class Data {
abstract public void DisplayValue();
}
class Integer extends Data {
int value;
Integer() {
value=100;
}
public void DisplayValue(){
System.out.println (value);
}
}
class Short extends Data {
short value;
Short() {
value = 5219;
}
public void DisplayValue(){
System.out.println (value);
}
}
// Pattern Classes
abstract class Factory {
abstract public Data CreateDataObject();
}
class IntFactory extends Factory {
public Data CreateDataObject(){
return new Integer();
}
}
class ShortFactory extends Factory {
public Data CreateDataObject(){
return new Short();
}
}
//Client classes
class Document {
Data pd;
Document(Factory pf){
pd = pf.CreateDataObject();
}
public void DisplayData(){
pd.DisplayValue();
}
}
//Test class
public class MyDoc {
static Document d;
public static void main(String[] args) {
d = new Document(new ShortFactory());
d.DisplayData();
}
}
- 运行截图
实验要求（提交点4）
- 参考http://www.cnblogs.com/rocedu/p/6736847.html
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)
- 实验代码
public class Complex {
// 定义属性并生成getter,setter
double RealPart;
double ImagePart;
// 定义构造函数
public Complex(){
RealPart = 0;
ImagePart = 1;
}
public Complex(double R,double I){
ImagePart = I;
RealPart = R;
}
//Override Object
public boolean equals(Object obj){
if(this == obj) {
return true;
}
if(!(obj instanceof Complex)) {
return false;
}
Complex complex = (Complex) obj;
if(complex.RealPart != ((Complex) obj).RealPart) {
return false;
}
if(complex.ImagePart != ((Complex) obj).ImagePart) {
return false;
}
return true;
}
public String toString() {
String string = "";
if (ImagePart > 0)
string = RealPart + "+" + ImagePart + "i";
if (ImagePart == 0)
string = RealPart + "";
if (ImagePart < 0)
string = RealPart + " " + ImagePart + "i";
return string;
}
// 定义公有方法:加减乘除
Complex ComplexAdd(Complex a) {
return new Complex(RealPart+a.RealPart,ImagePart+a.ImagePart);
}
Complex ComplexSub(Complex a) {
return new Complex(RealPart-a.RealPart,ImagePart-a.ImagePart);
}
Complex ComplexMulti(Complex a) {
return new Complex(RealPart*a.RealPart,ImagePart*a.ImagePart);
}
Complex ComplexDiv(Complex a) {
if(a.RealPart==0||a.ImagePart==0) {
System.out.println("被减数不能为0");
return new Complex();
}
double d = Math.sqrt(a.RealPart*a.RealPart)+Math.sqrt(a.ImagePart*a.ImagePart);
return new Complex((RealPart*a.RealPart+ImagePart*a.ImagePart)/d,Math.round((RealPart*a.ImagePart-ImagePart*a.RealPart)/d));
}
}
- 测试用例
import static org.junit.Assert.*;
import org.junit.Test;
import junit.framework.TestCase;
public class ComplexTest extends TestCase {
Complex complex = new Complex(1,1);
@Test
public void testAdd(){
assertEquals(new Complex(3.3,3.4), complex.ComplexAdd(new Complex(2.3,2.4)));
}
//测试加法
@Test
public void testSub(){
assertEquals(new Complex(-5.3,-2.4), complex.ComplexSub(new Complex(6.3,3.4)));
}
//测试减法
@Test
public void testMulti(){
assertEquals(new Complex(3.0,2.0), complex.ComplexMulti(new Complex(3.0,2.0)));
}
//测试乘法
@Test
public void testDiv(){
assertEquals(new Complex(1.0,1.0), complex.ComplexDiv(new Complex(1.0,1.0)));
assertEquals(new Complex(0.0,0.0), complex.ComplexDiv(new Complex(1.0,0.0)));
//assertEquals(new Complex(0.0,0.0), complex.ComplexDiv(new Complex(3,4)));
//边缘测试
}
@Test
public void testequals(){
assertEquals(true, complex.equals(new Complex(1.0,1.0)));
}
//测试判断相等
}
- 运行截图
实验提交点5
1.实验要求
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。
参考(http://www.cnblogs.com/rocedu/p/6736847.html)
- 实验截图
实验体会与总结
- 本次实验过后我更加理解了java语言面向对象的特点,同时学会了Junit的使用，对uml图有了初步了解但还没有掌握完全。需要进行更多的练习，才能更加熟悉。
| 步骤 | 耗时 | 百分比 |
|---|---|---|
| 需求分析 | 15 | 11.5% |
| 设计 | 20 | 15.3% |
| 代码实现 | 50 | 38.4% |
| 测试 | 30 | 23.0% |
| 分析总结 | 15 | 11.5% |
