Java小程序代码

1、Java 小程序代码/* 第一个程序 */public class Welcomepublic static void main(String args)这是你的第一个程序，欢迎你走入Java的大门 ");/* 学生信息导入 */class StudentTestpublic static void main(String args)Student aStudent = new Student();aStudent.setName(" 张楠 ");aStudent.setStudentNum("20030408");学生的姓名是 :"

2、 + aStudent.getName() + "，学号是 :" + aStudent.getStudentNum();class Peopleprivate String name;public String getName()return name;public void setName(String strName)name = strName;class Student extends Peopleprivate String studentNum;public String getStudentNum()return studentNum;public void

3、setStudentNum(String strStudentNum)studentNum = strStudentNum;/* 移位运算符测试*/public class BitMotionpublic static void main(String args)int a = 15;int b = 2;int x = a << b;int y = a >> b;int z = a >> b;/* 测试位的四种运算*/public class BitOperationpublic static void main(String args)int a = 15

4、;int b = 2;int x = a & b;int y = a | b;int z = a b;int r = x;/* 测试 boolean 型数据*/public class BooleanTestpublic static void main(String args)int a = 20;int b = 30;boolean x, y,z;x = (a > b);y = (a < b);z = (a + b) = 50);/* 测试不同数制表现形式及系统的自动转化功能*/public class ByteTestpublic static void main(S

5、tring args)byte x = 22;/十进制byte y = 022;/八进制byte z = 0X22;/十六进制转换成十进制， x=" + x);转换成十进制， y=" + y);转换成十进制， z=" + z);/* 测试 char 型与整数的转换*/public class CharTestpublic static void main(String args)char x = 'M'char y = '120'/请注意数字在输出时被转化成为字符char z = 'V'字符x=" + x)

6、;字符y=" + y);数值Z=" + (x+z);/* 常量的使用*/public class Constantspublic static void main(String args)final double CM_PER = 3.14;double radius = 5;/* 类常量的使用*/public class Constants2static final double CM_PER = 3.14;public static void main(String args)double radius = 5;/* 两个整数相除及求余数*/public class D

7、ividepublic static void main(String args)int a = 15;int b = 2;double c = 2;/* 测试 double 型数据类型*/public class DoubleTestpublic static void main(String args)double x = 22;double y = 42.6D;double z = x*y;型 x=" + x);/* 测试 float 型数值*/public class FloatTestpublic static void main(String args)float x =

8、 22.2F;float y = 42.6F;float z = x*y;/* 测试全局变量的操作*/public class GlobalVarint a = 10;double b = 20;public static void main(String args)GlobalVar globalVar = new GlobalVar();globalVar.print();public void print()/* 测试基本类型的初始化*/public class InitPrimitive1byte a;short b;int c;long d;float e;double f;char

9、 g;boolean h;public static void main(String args)InitPrimitive1 aInit = new InitPrimitive1();aInit.print();public void print()字节型，a=" + a);短整型，b=" + b);整数型，c=" + c);长整型，d=" + d);单精度型，e=" + e);双精度型，f=" + f);字符型，g=" + g);布尔型，h=" + h);/* 测试基本类型的初始化*/public class

10、InitPrimitive2public static void main(String args)InitPrimitive2 aInit = new InitPrimitive2();aInit.print();public void print()byte a;short b;int c;long d;float e;double f;char g;boolean h;字节型，a=" + a);短整型，b=" + b);整数型，c=" + c);长整型，d=" + d);单精度型，e=" + e);双精度型，f=" + f);字

11、符型，g=" + g);布尔型，h=" + h);/* 测试局部变量的操作*/public class LocalVarpublic static void main(String args)LocalVar localVar = new LocalVar();localVar.print();public void print()int a = 10;double b = 20;/* 测试局部变量的操作*/public class LocalVar2public static void main(String args)LocalVar2 localVar = new L

12、ocalVar2();localVar.print();public void print()int a = 10;double b = 20;/* 逻辑运算符测试*/public class LogicSignpublic static void main(String args)boolean x, y, z, a, b;a = 'A' > 'b'b = 'R' != 'r'x = !a;y = a && b;z = a | b;/* 关系运算符测试*/public class RelationTestp

13、ublic static void main(String args)boolean x, y, z;int a = 15;int b = 2;double c = 15;x = a > b;/true;y = a < b;/false;z = a != b;/true;/* 测试自增、自减操作*/public class SelfActionpublic static void main(String args)int x = 10;int a = x + x+;int b = x + +x;int c = x + x-;int d = x + -x;/* 短路现象测试*/pub

14、lic class ShortCircuitpublic static void main(String args)ShortCircuit a = new ShortCircuit();if( a.test1(0) && a.test2(2) && a.test3(2) elsepublic boolean test1(int value1)return value1 < 1;public boolean test2(int value2)return value2 < 2;public boolean test3(int value3)retur

15、n value3 < 3;/* 测试传址引用的实质*/public class StudentString strName;public static void main(String args)Student aStudent = new Student();/ 得到对象 Student 类的一个句柄 aStudentaStudent.setStudentName("张楠 ");Student bStudent = aStudent;/将 aStudent句柄复制给nextStudentbStudent.setStudentName("唐僧 ")

16、;String name = aStudent.getStudentName();/再看一下句柄aStudent的内容是否改变public void setStudentName(String name)strName = name;public String getStudentName()return strName;/* 强制转型测试*/public class TypeTranpublic static void main(String args)int x;double y;x = (int)22.5 + (int)34.7;/y = (double)x;/*强制转型可能引起精度丢失

17、* 测试传值引用的实质*/public class ValueReferenceint a = 10;public static void main(String args)ValueReference aValue = new ValueReference ();aValue.print();public void print()int b = a;/ 我们将 a 的值传给了/* 中断测试*/public class BreakTestpublic static void main(String args)for(int i = 1; i < 20; i+)if(i = 10)brea

18、k;/*while循环控制结构的测试*/public class BuyHousepublic static void main(String args)final double HOUSEFUND = 200000;double salary = 2000;double fund = 0;int years = 1;while (fund < HOUSEFUND)fund += salary*0.05*12;years+;salary = salary * 1.1;/*while循环控制结构的测试*/public class BuyHouse2public static void main(String args)final double HOUSEFUND = 200000;double salary = 2000;double fund = 0;int years = 1;dofund += salary*0.05*12;years+;salary = salary *1.1;while (fund < HOUSEFUND);/* 输出数字到控制台*/public class Circlepublic stati