Java Jdk6学习笔记[Ppt]

1. 1 Java Java Java Java

2. Java SunGreenProjectStar7 JamesGoslingOak JavaApplet 1995/5/23Java DevelopmentKits JDK1.0a2

3. Java JavaObject-Oriented Java DevelopmentKitsJDK J2SE 5.0Java 2 Platform Standard Edition5.0JDKJ2SE Development Kit 5.0

4. Java J2SE 5.0Java 2 Platform Standard Edition5.0JDKJ2SE Development Kit 5.0 JavaSE 6Java Platform, Standard Edition6JDK6Java SE Development Kit 6 261.6.0 6productversion1.6.0 developerversion

5. Java Simple Object-oriented Network-savvy Interpreted Robust Secure Portable High-performance

6. Java Java SE Java Platform, Standard Edition Java EE Java Platform, Enterprise Edition Java ME Java Platform, Micro Edition

7. Java Platform, Standard Edition (Java SE) Java

8. Java Platform, Standard Edition (Java SE) JVM JavaJava Virtual Machine,JVM JRE JavaJava SE Runtime Environment,JRE JDK Java

9. Java Platform, Enterprise Edition (Java EE) JavaSE API Multi- tieredWeb JSPServletEnterprise JavaBeansEJBJava Remote Method InvocationRMI

10. Java Platform, Micro Edition (Java ME) PDA

12. Java Java JavaSE API ContainerI/O Thread http://java.sun.com/javase/6/docs/api/inde x.html

13. Java http://www.google.com/ http://www.javaworld.com.tw/ http://java.sun.com/developer/onlineTraining/n ew2java/javamap/intro.html

14. 2 JDK PathClasspath Java

15. JDK JDK620061211 Update http://java.sun.com/javase/downloads/inde x.jsp

16. JDK JRE

17. JDK

18. JDK JRE JDKJRE JDKjre JDKJREJRE serverVMVirtualMachine

19. JDK JDKJREserver

20. JDK JDK bin JDK demo jre JDKJRE db ApacheDerbyJava

21. JDK JDK lib Java JDKJava bin Wrapper javac.exelib tools.jar

22. JDK JDK src.zip JavaAPI

23. Path javac Path

24. Path Path set Path= C:Program FilesJavajdk1.6.0bin;%Path% WindowsJREjava.exe C:WindowsSystem32 Path

25. Classpath Java Java Path Windows exe ClasspathJava JavaJVM class

26. Classpath JDK6JDK libJava javac -classpath classpath1;classpath2 WindowsPath .exe JavaClassPath JVM".class"

27. Java

28. Java HelloJava.java

29. Java Java.java Tab

30. Java javac HelloJava.java error: cannot read: HelloJava.java javac.java HelloJava.java:1: class HelloJava is public, should be declared in a file named HellJava.java

31. Java HelloJava.java:3: cannot find symbol javac PathPathJDK bin

32. Java java HelloJava Exception inthread"main" java.lang.NoClassDefFoundError java Exceptionin thread "main" java.lan.NosuchMethodError: main JavaEntrypointjava main(String[] args)method

33. UltraEdithttp://www.ultraedit.com/ Editplushttp://www.editplus.com/ JCreaterhttp://www.jcreator.com/ BlueJhttp://www.bluej.org/index.html IDE Eclipsehttp://www.eclipse.org/ NetBeanshttp://www.netbeans.org/

34. 3 Java

35. Java Class Block main()Method Statement public class HelloJava { public static void main(String[] args) { System.out.println("Java"); } }

36. CJava Cprintf() public class HelloJavaForC { public static void main(String[] args) { System.out.printf("%s Javan", "CFan"); } } System.out.printf("%s Java", "CFan").println(); System.out.printf("%s %d Javan", "CFan", 3);

37. /* * printf() * 2005/4/30 */ public class ThirdJavaForC { public static void main(String[] args) { // printf()J2SE5.0JDK5.0 System.out.printf("%s %dJavan", "CFan", 3); } }

38. /*1blabla /* 2blabla */ */ /*1blabla //2blabla */

39. Scanner J2SE 5.0java.util.Scanner Scanner scanner = new Scanner(System.in); System.out.print(""); System.out.printf("%s!n", scanner.next()); next() System.out.print(""); System.out.printf("%dn", scanner.nextInt());

40. BufferedReader BufferedReaderjava.io.Reader java.io.InputStreamReader BufferedReader bufferedReader = new BufferedReader( new InputStreamReader(System.in)); System.out.print(": "); String text = bufferedReader.readLine(); System.out.println(": " + text);

41. Systemout Stream java HelloJava > HelloJavaResult.txt Systemin

42. err err err System.out.println("out"); System.err.println("err"); java ErrDemo > ErrDemoResult.txt err

43. ' ' " " uxxxx 16Unicode xxx 8Unicode b f n r t (Tab) System.out.println("u0048u0065u006Cu006Cu006F");

44. J2SE5.0 //19 System.out.printf("%d%n", 19); //19 System.out.printf("%o%n", 19); //19 System.out.printf("%x%n", 19);

45. %% % %d 10ByteShort IntegerLong BigInteger %f 10FloatDouble BigDecimal %e, %E 10Float DoubleBigDecimal %a, %A 1610 FloatDoubleBigDecimal %o 8ByteShort IntegerLong BigInteger %x, %X 16ByteShort Integer LongBigInteger %s, %S %c, %C ByteShortCharacter Integer %b, %B "true""false""TRUE""FALSE" %B)null "true"null"false" %t, %T /API

46. System.out.printf("example:%.2f%n", 19.234); example:19.23 System.out.printf("example:%6.2f%n", 19.234); example: 19.23

47. Primitivetype short2 int4 long8 float4 double8

48. Primitivetype Unicode 128ASCII 'u0000''uFFFF' 2 truefalse

49. Primitivetype System.out.printf("short t%d ~ %dn", Short.MAX_VALUE,Short.MIN_VALUE); System.out.printf("int t%d ~ %dn", Integer.MAX_VALUE, Integer.MIN_VALUE); System.out.printf("long t%d ~ %dn", Long.MAX_VALUE, Long.MIN_VALUE); System.out.printf("byte t%d ~ %dn", Byte.MAX_VALUE, Byte.MIN_VALUE); System.out.printf("float t%e ~ %en", Float.MAX_VALUE, Float.MIN_VALUE); System.out.printf("double t%e ~ %en", Double.MAX_VALUE, Double.MIN_VALUE);

50. Java int age; // double scope; // intfloatdoublechar *&^% Java

51. int ageOfStudent; int ageOfTeacher; variable var might not have been initialized

52. '=' int ageOfStudent = 5; double scoreOfStudent = 80.0; char levelOfStudent = 'B'; System.out.println("tt"); System.out.printf("%4dt %4.1ft %4c", ageOfStudent, scoreOfStudent, levelOfStudent);

53. final final int maxNum = 10; maxNum = 20; cannot assign a value to final variable maxNum

54. +-*/ % System.out.println(1 + 2 * 3); System.out.println(1+2+3 / 4); System.out.println((double)(1+2+3) / 4);

55. int testNumber = 10; System.out.println(testNumber / 3); int testNumber = 10; System.out.println(testNumber / 3.0); System.out.println((double) testNumber / 3);

56. int testInteger = 0; double testDouble = 3.14; testInteger = testDouble; System.out.println(testInteger); possible loss of precision found : double required: int testInteger = testDouble ^ 1 error

57. testInteger =(int) testDouble; '%' count = (count + 1) % 360;

58. >>=< 5)); System.out.println("10 >= 5" + (10 >= 5)); System.out.println("10 < 5" + (10 < 5)); System.out.println("10

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Java Jdk6学习笔记[Ppt]