一个礼拜的Java实习笔记(国外英文资料).doc

一个礼拜的Java实习笔记(国外英文资料) On June 4, 1, what is Java? Java is a programming language, as well as an environment, The development environment Application environment The deployment environment Java was born on May 23, 1995 December 1.2, 1998, Java2 J2SE J2EE J2ME December 1.5, 2004 (5.0) Java JavaSE JavaEE) Eclipse is used to develop Java programs Second, write the first Java program Open eclipse and click File to create the Java project Create a class on the SRC X.java (Java source file) Hello. Java (source) Public is public and public The class decorator Hello, the name of the class Public is public and public Static is static Void indicates no return value type The main () method name String [] String array Args variable (parameter) The System of the System Out the output Print to print Ln newline If (condition expression true/false) { Statements; } If (conditional expression) { } The else { } The if () { aaaaaaaaaaaaaa {} else if () BBBBBBBBBBBBBBB {} else if () CCCCCCCCCCCCCC } ... { } else { DDDDDDDDDDDDDD } Package package Distinguish the same class name / / single comment / * * / * * * * * * / * * * / document comments API application interface System classes in Java. Lang All the classes under the java.lang package do not need to be imported Scanner class in Java. Util Java programming order: Package 1 0 - The import 0 - n Class 1 (public) A Java source file can only have an open class The file name of the source file must be the same as the class name Example: print 1-10 For (initialization statement; conditional statement; step statement) { Statements; } The initialization statement Conditional statements Statements; Step into the statement Conditional statements Statements; Step into the statement The death loop + break solves the cycle uncertainty problem Break means to jump out of this layer loop Continue says jump out of the loop and continue the next cycle Example: circle 500 times When you hit a multiple of 100, the loop ends There is no output of a mult