达内java培训学习笔记.doc

1、javaEclipseEclipsehttp:/www.eclipse.orgDownloadsEclipse3.33.3-3.23.2Eclipse SDKeclipse-SDK-3.2-win32.zipD:eclipseEclipseJDKJAVA_HOMECLASSPATHPATHD:eclipseeclipse.exeEclipse=JRE:1. Window-Preferences,Java-Installed JREs,jre1.5.0_07,Edit.2. Browse,JDK,OK.EclipseJDK-.=EclipseHellWorld1File-New-Project2

2、Java Project34JavaJRE(); .5Finish;6. src,New-Package,;7JavaC;8HelloWorld9public static void main(String args) Eclipsemain;10Finish;11Java-mainSystem.out.println(Hello World)12Ctrl-s HelloWorld.java13Run AsJava Application14Hello World=eclipse1. eclipse?:,(/opt/eclipse/eclipse).2. ?:Window-Preference

3、s,General-Editors-Text Editors,show line numbers.3. java?:Window-Preferences,General-Appearance-Colors and Fonts-Java-Java Editor Text FontChange.4. ?: Window-Preferences,Java-Code tyle-Code Templates,CommentsCode,Edit,.5. ?:,Refresh,.6. Eclipse:Ctrl+Enter:Alt+Shift+X+J:Ctrl+F11:Shift+Ctrl+F:Shift+C

4、trl+X:Shift+Ctrl+Y:Ctrl+1:Ctrl+M:Alt+Shift+S:SourceAlt+/:Ctrl+/:/Ctrl+D:Ctrl+:Ctrl+Shift+S:Java 20074231JavaGolsling1995523 Java199812 1.2 Java2 J2SE J2EE J2ME200412 1.5(5.0) Java JavaSE JavaEE JavaME2Java SE - JavaJava EE - Java ME - 31 - 2 - C+javac+55%3 - 4 - 4javajava.classJVM .java - .class - C

5、+205javamainmainpublic class Hello /public static void main(String args) / public static System.out.println(“Hello world“); / javac xxxx.java .class java xxxx - 6JAVA_HOME = /opt/jdk1.5.06 JDK - JDK = JRE JVM()+ +PATH = $Path:$Java_Home/bin:.ClassPath = . 7 - . java xxx.xxx.ClassA - javac -d . xxxx.

6、java - .classpackage xxx.xxximport xxx.xxx.xxx.ClassA; - ClassAimport p1.p2.p3.p4.p5.*; - p5javajava.lang8java /. /* .*/* .()*/,javadoc-htmlhtmljavadoc -d xxx.java author version param ,return throws10 - Javajavagotoconstjavajavasizeofjavabooleantruefalseenum assert 11123* * * *Java 20074241Java1 -

7、8a) byte 1 8 -128127short 2 16 -215215-1 -32768 32767int 4 32 -231231-1 -2147483648 2147483647 -long 8 64 -263263-1 long a = 40000l; /llongb) float 4 32 float a = 1.3f;double 8 64 double a = 1.3;doublelongdouble float a = 1.3; /error float a = (float)1.3;float a = 1.3f;c) char 2 16d) boolean false/t

8、rue /Javafalse0a babdouble , doubleabfloat , floatablong , longintchar16, aString String-“+“charASCIIu0000()charunicodechar c1 = a;char c2 = 97;char c3 =u0061; /20double022javajavac+* System.out.println(3/2) 1 *byte a = 1;a=a+2; /a += 2 ; /,a+ ; /1) = ; 22) = =n2n3) if(apos;i-)ai=ai-1;apos=value;ind

9、ex+;static void delete(int pos)index-;for(int i=pos;i - 2(a)0 |(b) |(c) |(d) |(e) |V6javaoverload* *-public void m(byte a,short b)System.out.println(“m(byte,short)“);public void m(short a,byte b)System.out.println(“m(short,byte)“);2bytem()-71238Java123Student s /Students = new Student(); /Student,Students.age sage9-static void method3(Student s)s=new Student(); /s.age=20; /Student stu=new Student();System.out.println(stu.age); / Studentagemethod3(stu); /method3s-System.out.println(stu.age); /-age10this