中南财大计科0801_JavaExp

《Java语言程序设计》实验报告实验序号：一实验项目名称：熟悉MyEclipse IDE、熟悉Java程序结构及简单语句一、实验目的及要求1、熟悉Workspace、Project、Class等概念及创建过程；2、掌握MyEclipse的初步使用；3、熟悉语法错误、语法警告及其显示方式；4、掌握程序基本结构；5、接触基本数据类型对应的类及类中的几个特殊常量；6、接触类及特殊常量的引用方法；7、熟悉System.out.println()的使用方法；8、表达式中常数以及结果的数据类型的转换二、实验设备（环境）Windows XP操作系统，MyEclipse 7.0编程软件三、实验内容与步骤1、将课本中例3-1、例3-2、例3-3输入到MyEclipse中并运行它们2、编程序：A, 设计至少10种不同类型的数据运用＋、－、*、/、％运算组合情况，测试结果的数据类型并显示在console中(用Poly.getType()方法)。

B, 设计至少6种数据被0和0.0除的情况，观察运行结果，如果能显示在console中，则显示。

C, 设计至少5种char型数据和int型数据之间相互转换的情况，显示在console中。

（每一句都要有明确的设计意图，并用单行注释在其后标出。

3段程序放到一个过程（方法）中）四、实验结果与数据处理Class1: CharToInt源代码：public class CharToInt {public static void main(String[] args) {int intResult,intVar=10;char charVar='语';intResult=intVar+charVar;System.out.println("The char is:"+charVar);System.out.println("Thechar'sUnicodeis:\\u"+Integer.toHexString(charVar));System.out.println("The int value corresponding to thechar is:"+newInteger(charVar).toString());System.out.println("Int"+intVar+"adda the char,theresult is:"+intResult);}}实验结果：The char is:语The char's Unicode is:\u8bedThe int value corresponding to the char is:35821Int10adda the char,the result is:35831Class2: Assign源代码：public class Assign{public static void main(String[] args) {int x,y;float z=3.414f;double w=3.1415;boolean truth=true;char c;String str;String strl="bye";c='A';str="Hi out there";x=6;y=1000;System.out.println("x="+x);System.out.println("y="+y);System.out.println("z="+z);System.out.println("w="+w);System.out.println("truth+"+truth);System.out.println("c="+c);System.out.println("str="+str);System.out.println("strl="+strl);}}实验结果：x=6y=1000z=3.414w=3.1415truth+truec=Astr=Hi out therestrl=byeClass3: SomeConstTest源代码：public class SomeConstTest {public static void main(String[] args) {System.out.println("Byte.MAX_VALUE="+Byte.MAX_VALUE); System.out.println("Byte.MIN_VALUE="+Byte.MIN_VALUE);System.out.println();System.out.println("Short.MAX_VALUE="+Short.MAX_VALUE); System.out.println("Short.MIN_VALUE="+Short.MIN_VALUE); System.out.println();System.out.println("Integer.MAX_VALUE="+Integer.MAX_VALUE);System.out.println("Integer.MIN_VALUE="+Integer.MIN_VALUE);System.out.println();System.out.println("Long.MAX_VALUE="+Long.MAX_VALUE);System.out.println("Long.MIN_VALUE="+Long.MIN_VALUE);System.out.println();System.out.println("Float.MAX_VALUE="+Float.MAX_VALUE); System.out.println("Float.MIN_VALUE="+Float.MIN_VALUE); System.out.println();System.out.println("Double.MAX_VALUE="+Double.MAX_VALUE);System.out.println("Double.MIN_VALUE="+Double.MIN_VALUE);System.out.println();System.out.println("Float.POSITIVE_INFINITY="+Float.POSITIV E_INFINITY);System.out.println("Float.NEGATIVE_INFINITY="+Float.NEGATIVE_INFINITY);System.out.println();System.out.println("Double.POSITIVE_INFINITY="+Double.POSITIVE_INFINITY);System.out.println("Double.NEGATIVE_INFINITY="+Double.NEGATIVE_INFINITY);System.out.println();System.out.println("Float.NaN="+Float.NaN);System.out.println();System.out.println("Double.NaN="+Double.NaN);System.out.println();}}实验结果：Byte.MAX_VALUE=127Byte.MIN_VALUE=-128Short.MAX_VALUE=32767Short.MIN_VALUE=-32768Integer.MAX_VALUE=2147483647Integer.MIN_VALUE=-2147483648Long.MAX_VALUE=9223372036854775807Long.MIN_VALUE=-9223372036854775808Float.MAX_VALUE=3.4028235E38Float.MIN_VALUE=1.4E-45Double.MAX_VALUE=1.7976931348623157E308Double.MIN_VALUE=4.9E-324Float.POSITIVE_INFINITY=InfinityFloat.NEGATIVE_INFINITY=-InfinityDouble.POSITIVE_INFINITY=InfinityDouble.NEGATIVE_INFINITY=-InfinityFloat.NaN=NaNDouble.NaN=NaNClass4: ChangeDateType源代码：public class ChangeDataType {public static void main(String[] args) {byte Mybyte=2;int Myint=5;long Mylong=13L;float Myfloat=5.0f;double Mydouble=13.5;char Mychar='中';int intX=(int)Mychar;/*将char类型强制转换成int类型*/char charVarOne='天';int intY=(int)charVarOne;/*将char类型强制转换成int类型*/char charVarTwo='空';int intZ=(int)charVarTwo;/*将char类型强制转换成int类型*/System.out.println(Poly.getType(Mybyte+Myint));/*byte型与int型做加法运算*/System.out.println(Poly.getType(Myint-Myfloat));/*int型与float型做减法运算*/System.out.println(Poly.getType(Mybyte+Mychar));/*byte型与char型做加法运算*/System.out.println(Poly.getType(Mybyte*Myint));/*byte型与int型做乘法运算*/System.out.println(Poly.getType(Myint*Mylong));/*int型与long型做减乘法运算*/System.out.println(Poly.getType(Myint*Myfloat));/*int型与float型做乘法运算*/System.out.println(Poly.getType(Mylong/Myint));/*long型与int型做除法运算*/System.out.println(Poly.getType(Myint/Myfloat));/*int型与float型做除法运算*/System.out.println(Poly.getType(Mydouble%Myint));/*double 型与int型做减法运算*/System.out.println(Poly.getType(Mylong%Myint));/*long型与int型做除法运算*/System.out.println();System.out.println("Mybyte/0.0="+(Mybyte/0.0));System.out.println("Myint/0.0="+(Myint/0.0));System.out.println("Myfloat/0="+(Myfloat/0));System.out.println("Mylong/0.0="+(Mylong/0.0));System.out.println("Mychar/0.0="+(Mychar/0.0));System.out.println("Mydouble/0="+(Mydouble/0));System.out.println();System.out.println("把字符型'中'强制转换成整型后intX="+intX); System.out.println("把字符型'天'强制转换成整型后intY="+intY); System.out.println("把字符型'空'强制转换成整型后intZ="+intZ); System.out.println("Myint+Mychar="+(Myint+Mychar));System.out.println("Myint+charVarOne="+(Myint+charVarOne)); System.out.println();}}class Poly{private final static String INT_TYPE = "int";private final static String LONG_TYPE = "long";private final static String DOUBLE_TYPE = "double";private final static String FLOAT_TYPE = "float";private final static String CHAR_TYPE = "char";private final static String BYTE_TYPE = "byte";private final static String SHORT_TYPE = "short";private final static String BOOLAEN_TYPE = "boolean";public static String getType(int i) {return INT_TYPE;}public static String getType(long l) {return LONG_TYPE;}public static String getType(double d) {return DOUBLE_TYPE;}public static String getType(float f) {return FLOAT_TYPE;}public static String getType(char c) {return CHAR_TYPE;}public static String getType(byte by) {return BYTE_TYPE;}public static String getType(short s) {return SHORT_TYPE;}public static String getType(boolean bo) {return BOOLAEN_TYPE;}public static String getType(Object obj){return obj != null ? obj.toString().split("@")[0] : null; }}实验结果：intfloatintintlongfloatlongfloatdoublelongMybyte/0.0=InfinityMyint/0.0=InfinityMyfloat/0=InfinityMylong/0.0=InfinityMychar/0.0=InfinityMydouble/0=Infinity把字符型'中'强制转换成整型后intX=20013把字符型'天'强制转换成整型后intY=22825把字符型'空'强制转换成整型后intZ=31354Myint+Mychar=20018Myint+charVarOne=22830五、分析与讨论（体会、感想、意见、建议）刚刚学习一个新的编程软件，就像当初刚开始学习VC＋＋时一样，不知从哪下手。