20165317JAVA实验二-面向对象程序设计
JAVA实验二-面向对象程序设计
提交点一
参考Intellj IDEA 简易教程-单元测试完成单元测试的学习
- 在IDEA中建立名为MyUtil5317的project，并在其src文件夹中创建名为MyUtil5317的public类，并输入如下代码。
public class MyUtil5317{
public static String percentage2fivegrade(int grade){
if (grade < 60 && grade >= 0 )
return "不及格";
else if (grade < 70 && grade >= 0 )
return "及格";
else if (grade < 80 && grade >= 0 )
return "中等";
else if (grade < 90 && grade >= 0 )
return "良好";
else if (grade <= 100 && grade >= 0 )
return "优秀";
else
return "错误";
}
}
- 在项目根目录下建立名为test的子目录，并将其设定为test的源代码存放目录，在目录中建立测试源代码，并按照Intellj IDEA 简易教程-单元测试的要求进行操作，其中代码如下：
import org.junit.Test;
import junit.framework.TestCase;
public class MyUtil5317Test extends TestCase {
@Test
public void testNormal() {
assertEquals("不及格", MyUtil5317.percentage2fivegrade(55));
assertEquals("及格", MyUtil5317.percentage2fivegrade(65));
assertEquals("中等", MyUtil5317.percentage2fivegrade(75));
assertEquals("良好", MyUtil5317.percentage2fivegrade(85));
assertEquals("优秀", MyUtil5317.percentage2fivegrade(95));
}
@Test
public void testException() {
assertEquals("错误", MyUtil5317.percentage2fivegrade(-5));
assertEquals("错误", MyUtil5317.percentage2fivegrade(105));
}
@Test
public void testBoundary() {
assertEquals("不及格", MyUtil5317.percentage2fivegrade(0));
assertEquals("及格", MyUtil5317.percentage2fivegrade(60));
assertEquals("中等", MyUtil5317.percentage2fivegrade(70));
assertEquals("良好", MyUtil5317.percentage2fivegrade(80));
assertEquals("优秀", MyUtil5317.percentage2fivegrade(90));
assertEquals("优秀", MyUtil5317.percentage2fivegrade(100));
}
}
- 结果截图如下
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。
- 按照上述博客和第一提交点完成代码的编辑
public class StringBufferDemo{
public static void main(String [] args){
StringBuffer buffer = new StringBuffer();
buffer.append('S');
buffer.append("tringBuffer12345");
System.out.println(buffer.charAt(1));
System.out.println(buffer.capacity());
System.out.println(buffer.indexOf("tringBuffer12345"));
System.out.println("buffer = " + buffer.toString());
System.out.println(buffer.length());
}
}
- 编辑测试用例如下
import org.junit.Test;
import junit.framework.TestCase;
public class StringBufferDemotest extends TestCase {
StringBuffer jh = new StringBuffer("nxy and jh");
StringBuffer nxy = new StringBuffer("nxy and jh danthony nb");
public void testcharat() {
assertEquals('n', jh.charAt(0));
assertEquals('n', nxy.charAt(0));
}
public void testcapacity() {
assertEquals(26, jh.capacity());
assertEquals(38, nxy.capacity());
}
public void testlength() {
assertEquals(10, jh.length());
assertEquals(22, nxy.length());
}
public void testindexof() {
assertEquals(0, jh.indexOf("nxy"));
assertEquals(20,nxy.indexOf("nb"));
}
}
- 提交的结果截图
提交点三
- 实验题目：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
- 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 = 5317;
}
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 ShortFactory extends Factory {
public Data CreateDataObject(){
return new Short();
}
}
class Document {
Data pd;
Document(Factory pf){
pd = pf.CreateDataObject();
}
public void DisplayData(){
pd.DisplayValue();
}
}
public class MyDoc {
static Document d;
public static void main(String[] args) {
d = new Document(new ShortFactory());
d.DisplayData();
}
}
- 结果运行截图
提交点四
- 任务：以TDD的方式开发一个复数类Complex
- 定义属性并生成getter,setter
- double RealPart;
- double ImagePart
- 实验代码
public class Complex {
double R;
double I;
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 + c.I);
}
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) / (c.I * c.I + c.R * c.R), (I * c.I + R * c.R) / (c.I * c.I + c.R * c.R));
}
public String toString() {
String str = "";
if (I > 0)
str = R + "+" + I + "i";
if (I == 0)
str = R+"";
if (I < 0)
str = R + "" + I + "i";
return str;
}
public boolean equals(Object obj){
if (this == obj)
return true;
if(obj==null)
return false;
if(obj instanceof Complex){
Complex p = (Complex) obj;
if(p.R==this.R &&p.I==this.I )
return true;
}
return false;
}
}
- 调试代码如下
import junit.framework.TestCase;
import org.junit.Test;
public class ComplexTest extends TestCase {
Complex c1 = new Complex(1.0,2.0);
Complex c2 = new Complex(2.0,2.0);
Complex c3 = new Complex(2.0,0.0);
@Test
public void testGetRealPart() throws Exception {
assertEquals(-1.1, Complex.getRealPart(-1.1));
assertEquals(6.0, Complex.getRealPart(6.0));
assertEquals(0.0, Complex.getRealPart(0.0));
}
@Test
public void testGetImagePart() throws Exception {
assertEquals(-1.1, Complex.getImagePart(-1.1));
assertEquals(6.0, Complex.getImagePart(6.0));
assertEquals(0.0, Complex.getImagePart(0.0));
}
@Test
public void testComplexAdd() throws Exception {
assertEquals("3.0+4.0i", c1.ComplexAdd(c2).toString());
assertEquals("3.0+2.0i", c1.ComplexAdd(c3).toString());
assertEquals("4.0+2.0i", c2.ComplexAdd(c3).toString());
}
@Test
public void testComplexSub() throws Exception {
assertEquals("-1.0", c1.ComplexSub(c2).toString());
assertEquals("-1.0+2.0i", c1.ComplexSub(c3).toString());
assertEquals("0.0+2.0i", c2.ComplexSub(c3).toString());
}
@Test
public void testComplexMulti() throws Exception {
assertEquals("-2.0+6.0i", c1.ComplexMulti(c2).toString());
assertEquals("2.0+4.0i", c1.ComplexMulti(c3).toString());
assertEquals("4.0+4.0i", c2.ComplexMulti(c3).toString());
}
@Test
public void testComplexComplexDiv() throws Exception {
assertEquals("0.75+0.75i", c1.ComplexDiv(c2).toString());
assertEquals("1.0+0.5i", c1.ComplexDiv(c3).toString());
assertEquals("1.0+1.0i", c2.ComplexDiv(c3).toString());
}
@Test
public void testEquals() throws Exception{
assertEquals(false,c1.equals(c2));
assertEquals(false,c1.equals(c3));
assertEquals(false,c2.equals(c3));
assertEquals(true,c1.equals(c1));
}
}
- 运行结果如下
提交点五
- uml图如下
