新・明解Java入門

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1 第 1 章画面文字表示 Java Java Java Java Java JRE Java JDK

2 Java Java Java Java 誕生 Fig.1-1 Oak Java Sun Microsystems 2010 Oracle Java Oracle 4 Java Fig.1-1Java Alice

3 3 Java 特徴 Java 1-1 Write Once, Run Anywhere. Column 1-3 C++

4 41 Java Java Java 発展 Table Java Java EoD Ease of Development Java Standard EditionSE Enterprise EditionEE Micro EditionME

5 5 Table 1-1Java JDK / 1 JDK / 2 J2SE 1.2 Playground 1998 / 12 J2SE 1.3 Kestrel 2000 / 5 J2SE Merlin 2002 / 2 J2SE Tiger 2004 / 9 Java 1-1 Java SE Mustang 2006 / 12 Java SE Dolphin 2011 / 7 Java SE / 3 学習準備 Java JDKJava Development Kit Java SDKSoftware Development Kit Java C C++

6 画面文字表示作成実行 List 1-1 Java // class Hello { List 1-1 System.out.println("Java"); System.out.println(""); Chap01/Hello.java 実行結果 Java " { [ ] ( ) " /. ; Table 1-2p.17 source program source file source class class Hello.java Hello.java

7 7 Fig.1-2 MeikaiJava Chap01, Chap02, p MeikaiJava Chap1 Hello.java HowAreYou1.java HowAreYou4.java Chap2 Chap Fig.1-2 Fig.1-3 List 1-1 // class Hello { System.out.println("Java"); System.out.println("");.java / Chap01/Hello.java 実行結果 Java Fig.1-3

8 81 実行 Fig.1-4 a bytecode b class Hello { // a javac b java Hello.java Hello.class Fig.1-4 a compile Hello.java Column 1-1 javac Hello.java Ÿ.java UNIX % MS-Windows C:\> C: > Fig.1-5 Hello.class class file MeikaiJava Chap1 Hello.java Hello.class Hello.java Fig.1-5

9 9 b Hello java Hello Ÿ.class p.6 List javac java Column 1-1 Linux MS-Windows OS Java cd cd /MeikaiJava/Chap01 Ÿ MS-Windows MeikaiJava D d: Ÿ OS /, \, /

10 101 ( 注釈 ) // // comment a traditional comment /* */ /* */ /* */ */ /* b b documentation comment /** */ a 13 /** */

11 11c end of line comment // // /** /*!! */ */ */ */ // /* //!! */ // /*!! */ 1-2 Column 1-2 Java class Hello { // System.out.println("Java"); System.out.println(""); 実行結果 // // /* */ class Hello { /* System.out.println("Java"); System.out.println(""); */ 実行結果

12 121 構造 Fig.1-6 Hello main class Hello { System.out.println("Java"); System.out.println(""); Fig.1-6 宣言 Hello classclass declaration class { // main Hello Abc abc.java main main main method public static void (String[] args) // main

13 13文 main statement 4 4 Fig.1-7 main System.out.println("Java"); System.out.println(""); Fig.1-7 main main 1-2 Java main 7 if while main ; ; Java main { { 1-1 ;

14 141 文字列 System.out.println("Java"); System.out.println(""); "Java" "" " string literal "ABC" A B C Fig "" "ABC" "Java" A B C J a v a 3 14 Fig.1-8 画面出力 stream Fig.1-9 S ystem.o ut standard output stream println ( ) "ABC" " " Java

15 15println ln line println ln p rint List 1-2 System.out.println("ABC"); ABC Fig.1-9 HowAreYou1.java 1-2 List 1-2 // class HowAreYou1 { Chap01/HowAreYou1.java 実行結果 System.out.print(""); System.out.println(""); print println method main ( ) 7 System.out.print(...) System.out.println(...). 8 println ( ) System.out.println(); // ABC ABC ABC ABC

16 161 文字列連結 + List 1-3 List 1-3 Chap01/HowAreYou2.java // class HowAreYou2 { 実行結果 System.out.println("" + ""); + System.out.println("" + ""); 改行 \n List 1-4 List 1-4 // class HowAreYou3 { System.out.println("\n"); Chap01/HowAreYou3.java 実行結果 \n \ n \n \ 5-3

17 17記号文字読方 Table 1-2 MS-Windows \ List 1-4 Table * / \ JIS $ %., : ; ' " ( ) { [ ] < >?! & ~ JIS - - ^ # _ System.out.println(" n"); =!! 1-2

18 181 自由形式記述 List 1-5 List 1-4 List 1-5 */class HowAreYou4 { public static void main( String [ ] args) { System. out. println ( "\n" ) ; /* Chap01/HowAreYou4.java 実行結果 free formatted classpublicvoidsystem, out, //, /* Sys tem " " System.out.println("\n ");

19 19JDKJava Java Java JREJava Java Runtime Environment Fig.1C-1 JRE JVMJava Java Virtual Machine JDK JDK JRE JRE Java JVM JRE Fig.1C-1JDK JRE JDK JRE MS-Windows Mac OS-X Linux Fig.1C-2 javac JVM Write Once, Run Anywhere. p Column 1-3 JRE(Java 実行環境 ) JVM(Java 仮想 ) JVM JVM MS-Windows JRE JVM Mac OS-X JRE JVM Linux JRE MS-Windows Mac OS-X Linux Fig.1C-2Java JVM Java Java

20 201 List 1-1 List 1-4 main { Fig.1-10, 3, 6, 9, for (int i = 1; i <= 9; i++) { for (int j = 1; j <= 9; j++) { System.out.printf("%3d", i * j); System.out.println(); 4 p.134 Fig

21 21 C C++ Java 8 Java C++ puts printf Java System.out.print 1-2 Column 1-4 文字 1 MS-Windows Fig Fig.1C-3 for (int i = 1; i <= 9; i++) { for (int j = 1; j <= 9; j++) { System.out.printf("%3d", i * j); System.out.println(); Fig.1C-3Fig

22 221 Java Java Java JDK.java javac.class java main main System.out.print System.out.println " " + \n

23 23.java Abc.java // /* */ /** */ // Chap01/Abc.java Abc 1 class Abc { main System.out.print("ABC"); System.out.print("DEF" + "GHI"); System.out.println("JKL\nXYZ"); System.out.print(...) // System.out.println(...) // javac Abc.javaŸ java Abc.class.class java AbcŸ 実行結果 ABCDEFGHIJKL XYZ class p.7

明解Java入門編

明解Java入門編 1 Fig.1-1 4 Fig.1-1 1-1 1 Table 1-1 Ease of Development 1-1 Table 1-1 Java Development Kit 1 Java List 1-1 List 1-1 Chap01/Hello.java // class Hello { Java System.out.println("Java"); System.out.println("");