LJ14 JAVA基礎程式設計

Java ⟡䣵䧲⻶娔姯 ⷏⌇曢免媙䧲䟻䙣⛿晱 ]]]VIYINUURIUSZ] 奰䣉⟥䱯䧪Ჾ⛀濕-DYDょ䏦䣉ⷍ䫟ᶉ 䧪ᵊ⛀濕壹墡Ʊ宅㑗Ʊ婈㐶䧪᳇⛀濕 -DYD弉䩕⨎ 䧪▙⛀濕-DYD㬸䨔㉥⃴ 䧪ᵒ⛀濕-DYD庲◆㉥⃴ 䧪Ჾ⛀濕-DYDょ䏦䣉ⷍ䫟ᶉ ⑬ 㡀妔 •⑬ 䖬㣗 • ⹜䏝㯹ᳫᵄ墡ᵾ浺㓭-DYD • ᵾ浺㓭-DYD6(Ʊ-DYD0(Ʊ-DYD(( • -DYD6(⚸㗪㙴㢉 • -DYD奜墾䕂䄷⻥ • 摉䔺-DYDヾ⺃曆䕂㯿䣉 ᵾ浺㓭-DYD" • 㽸ḓ方値岝ㄉ㤝徻㗇-DYD" • -DYD㓭ᵾ浺㘯堽"㓭方値䕂士壆䣉ⷍ彂㓭 • 妉␍-DYD䣉ⷍ㓭ᵾ浺"弈ヰ⒌"㓭ㄉ㤝⺃ὗ⅝侻⒌" • 㖶⫾⳶䗉⃮审Ჾ⛄-DYD㖶濕彂㓭᳋㳃㠘⩁䕂Ḛ䏦濊 • -DYD㓭ᵾ浺㣡䕂奜㮓⌠濨$SSOHW⍊6FULSW䕂Ⲭ⃣㓭ᵾ浺濨 • ハ᳋㓭⫆㠫ᵸ➩濕⟨⫆㠫䕂䨒㜆濕ハ⊭侻䗉᳋む濊㽸ḓ方値岝ㄉ㤝徻㗇-DYD濨 • 㗇Ჾỉ⚵圊䍮❁⊭ᶣ⚵圊-DYDヾ㍮⪩䕂䣉ⷍ濕彡浺⽦⫯⊭ ᶣ◦方値ピㄉ㤝᳈弉圊-DYDょ䏦䣉ⷍ濕⇃ㆪ弈ヰƱ↓䐩Ʋ ⛽䈮Ὥ㹷Ɲhttps://handy-games.com/en/gaming-nostalgia-java-games-by-handygames/ ⛽䈮Ὥ㹷Ɲhttps://www.youtube.com/watch?v=CadxM2B6zy8&ab_channel=CodeBode 㓭方値䕂士壆䣉ⷍ彂㓭ġ • -DYD䣉ⷍ奜墾濑-DYD SURJUDPPLQJODQJXDJH濒尵㵎㑺ⴲ濕≝ 坩䣯㽸 ĩ2DNĪ濕㓭䐴㔀*UHHQ WHDP嶝榒摉䔺◖效ᳫ䏦Ṅ㍮⪩ 6WDUㄉㆿ士ὗ᳈ょ䏦䣉ⷍ䕂 Ჾỉ䣉ⷍ奜墾Ʋ ⛽䈮Ὥ㹷ƝOracle 㓭方値䕂士壆䣉ⷍ彂㓭ġ • ハ䗉⃮䥕ヴ⟔映㗇朄㤟㣷濕ヾᶣ⫅⩁⊔⋋2DN濕Ḅ⹊Ṅ 䔺䊼2DN廗ỉ⋋䣯Ⲱ䱑坩壹 ⁈ḽ䏦ᵄ濕⟥⩴⑛匕⍔␟彈壌妔㑮䕂⋋䣯濕ㄋ昆㤝Ჾ↓ 䕂⫅ᴉ㏷⋋㽸ĩ-DYDĪƲ ⛽䈮Ὥ㹷ƝOracle James Gosling 弈ヰ⒌"㓭ㄉ㤝⺃ὗ⅝侻⒌" • ㄉ㤝ᳫ䕂-DYD䣉ⷍ婑⟥⩴⫋ -DYD仱䁝侻失 • ᳤᳋㓭ヾ㗇䕂ㄉ㤝徻㏭㊲ -DYD濕⺃曆㗇⚵圊䍮❁ • -DYDᴝ᳋⊨㓭㽸ᵄ㍮⪩弈ヰ濕圊ᵉ㖄Ʊ佟䠦∱㔀圊⾃⃄㙎Ʊ 方⨎徳ᶴ嶝榒䨇濕ᴝ徻⊭ᶣ 䏦-DYDṄ㍮⪩⚵圊Ʋ ⛽䈮Ὥ㹷Ɲhttps://www.rishabhsoft.com/blog/understanding-javaapplication-development 㖶⫾⳶䗉⃮审Ჾ⛄-DYD㖶濊 • ⽦䗉⃮㖶⫾审Java䕂㖶屈⟘濕圦䟸䏝㯹ᳫ屈⟘㘯堽ょ䏦 ᵄJavaㄾ圑濕䏝㯹ᳫ㿟唓᳋㓭Java濕廗㓭䗝䕂濊 ⛽䈮Ὥ㹷ƝOracle :KDWLV-DYD⟨⫆㠫䕂䨒㜆濕ハ⊭侻䗉᳋む濊 • 㓭Ჾ䣬ㄾ圑濑廗㘯堽䏦ᵄ-DYD濒 • 㓭Ჾ䣬䣉ⷍ奜墾濑⽦⊭ᶣ䏦-DYD⪩ỉ䣉ⷍ濒 • ⊭㍮⪩ょ䏦䣉ⷍ濑廗䣉ⷍ㓭䏦-DYD摉䔺䕂濒 • 㓭ㄉ㤝᳈䕂Ჾ曃审涜濑廗㧼ㄉ㤝㏭㊲-DYD⑒濒 • 㓭Ჾ䣬妾䏝ⲣ‵濑ハ㗁-DYD濕ハ⾱ㄼⲣḚ濒 ᵾ浺㓭-DYD6(Ʊ-DYD0(Ʊ-DYD(( • ㊎ṙᵄ⩊㐲䕂-DYDㄾ圑䏠⍿濕ṛⳀ⛲斾㬀᳹堿⇾⃄㽸᳇ ỉ᳋⋊䕂䣬朜濕⇃ㆪᵄ • -DYD6(㣗㵔䄆濑⑬㤝Ḛ㠫Ʋ㗪奰䣉ᶣ㨢ⴱ⊮㽸㵔濒 • -DYD0(巓悍䄆濑0RELOHƱ3'$䨇圊↓垛丬濒 • -DYD((ᶿ㠫䄆濑:HE新䦭ょ䏦濒 -DYD6(㙴㢉 ⛽䈮Ὥ㹷ƝOracle -'. • …⋋㓭-DYD6('HYHORSPHQW.LWV濕 ᳫ㑅⋋㽸-DYD㣗㵔䄆摉䔺ⲣ‵䩯Ʋ • ㊎ṙ䲦娭┦濑&RPSLOHU濒帇㊙榖敌奜墾㽸巁Ḍ敌䕂奜墾ᴉ⟔濕彂㊎ ṙ㗇‴⩁䖶撚䕂摉䔺Ʊ⚵圊Ʊ㳪夤䨇ⲣ‵Ʋ • ◦㍮⪩⠻-DYD䣉ⷍ䕂≝⢉䝺濑6RXUFHFRGH濒ᴉ⹊濕彂⺃曆⩇ 垛-'.濕ㄋ⊭ᶣ廰圊㉣᳉Ṅ䕂䲦娭Ʊ 㳪夤䨇ⲣḚƲ -5( • …⋋㽸-DYD5XQWLPH (QYLURQPHQW濕ᳫ㑅⋋㽸-DYD⚵圊䍮❁Ʋ • ㊎ṙ-DYDょ䏦䣉ⷍ䖶撚宅㵎䕂Ჾỉ 䍮❁濕ᾍ㓭㣗㵔朜⃣⵩濑&ODVV OLEUDU\濒濕-DYD唙㎪㤝┦䨇Ʋ -90 • …⋋㽸-DYD9LUWXDO 0DFKLQH濕⇃ㆪ◦-5(ᴉᳫƲ • ㍮⪩᳤䲦娭⠻䕂-DYD䣉ⷍ㗁 ⫅-90䐴ḚᲾ⊮䗝⪤䕂㤝┦Ʋ • 婑-DYD䣉ⷍ⊭ᶣ弉圊㑺⋂ỉ ⴱ⊮ᴉ᳈Ʋ -DYD奜墾䕂䄷⻥ • 䫟⑬䕂濑6LPSOH濒 • 䄧ᶴ⫌⋏䕂濑2EMHFWRULHQWHG濒 • ⩇…䕂濑6HFXUH濒 • ⟘⚵圊䲐䕂濑0XOWLWKUHDG濒 • 岦ⴱ⊮濑3ODWIRUPLQGHSHQGHQW濒 -DYD奜墾 • -DYD䣉ⷍ奜墾⫯㓭䏦Ṅ僅方値㵛廘䕂奜墾濕⽦ḽ䏦廗ỉ 奜墾⌻ᶢ方値Ṅ㽸⽦Ḛヾ㇅⩘䕂↓Ḛ濕䣉ⷍ奜墾䕂䖬䕂 ⫯㓭◦㨢Ʋ -DYD⚵圊僅弉Ḛ -DYD䄆㗪㨵䣉 -DYD奜墾储-'.䄆㗪ᶣṄ䱑㨵 ᵄ壯⟘㧟㖲㑮濕ᴝ◦⚸㗪䣉ⷍ⵩ ᳫ❜⅞ᵄ⟥悍䕂朜⃣⍊⠕ᶴƲ⹜ -6(摉⢉濕-DYD奜墾䕂婈↓ 䏯-DYD&RPPXQLW\3URFHVV 濑-&3濒䩟䋄濕-&3ḽ䏦-DYD塍䪂妉㬀濑-DYD6SHFLILFDWLRQ 5HTXHVWV濕-65V濒Ṅⶸ娮⍊⩘乧 ⫋-DYDⴱ⊮‥⩷䕂㑮❜⍊Ậ㏷Ʋ ⅎ⮠凮⛽䈮Ὥ㹷 (䶔⟡䙥䦸)Ɲhttps://zh.wikipedia.org/wiki/Java%E7%89%88%E6%9C%AC%E6%AD%B7%E5%8F%B2#Java_SE_8 摉䔺-DYDヾ⺃曆䕂㯿䣉 • ᳉巇Ʊ⩇垛-'. • 士⩘3DWK䍮❁婈㐶妉⊁仁奰⛀亿⳩㎋Ḛ㨣椝 • ḽ䏦䯒㑅⨕㥒㜆㍮⪩ℭ㥒⋋ MDYD䕂䣉ⷍ • ᴝ⊭ḽ䏦6XEOLPHƱ1RWHSDG䨇‴ᶔ㑅⨕䲦巭┦ • ᴝ⊭ḽ䏦(FOLSVHƱ,QWHOOMƱ1HWEHDQVƱ9LVXDO&RGH䨇,'( 㐲⋆摉䔺ⲣ‵ • 妉⊁仁奰⛀亿⳩䕂弶䏦 • 䲦娭僅⚵圊 • ⹜$3,6SHFLILFDWLRQᳫ㚣夠ヾ斾䕂$3,ᴉ⅝侻 2UDFOH-'.YV2SHQ-'. • ‧仃ᴉ摑㭐㗇䗝㨡䕂ㄾ圑Ⲭ⃣濕▞㽸悛⫋2UDFOH-'.㢉 ⶸ弌䣉ᴝ㓭⚸㑺2SHQ-'.䕂˛ • ◦⻥侻㑷映濕2UDFOH◦暽ょ侻⅙⍊-90⻥侻㑷映堿⠻⹕⟘Ʋ 䏯㑺‴⫋ᶿ㠫⩠ヴ䕂悋塔濕⩁㖲⅞悋塔䤧⩘⻥Ʋ • 䖶㪒ᴉ᳉濕2SHQ-'.⫅㖲曹䳿◮䔺ⳁ䄆㗪Ʋ▞㨢冣弅⃮᳋䤧 ⩘䕂␍朊Ʋ㛷㎘䟼乢⊋栉⊭ᶣ∱㔀䈰⹕墡㬸Ʋ ᳉巇Ʊ⩇垛-'. 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JAVA_HOME=/Library/Java/JavaVirtualMachines/openlogic-openjdk-11.jdk/Contents/Home PATH=$JAVA_HOME/bin:$PATH: export JAVA_HOME export PATH 䲦娭僅⚵圊 • -DYDᶣℋ • ḽ䏦MDYDFⲣ‵䣉ⷍ䲦娭≝⢉䝺㽸 FODVV㥒㜆 • ḽ䏦MDYDⲣ‵䣉ⷍ弉圊Ʊ㳪夤-DYD䣉ⷍ㓭⋤䧤⋆⅝侻 • MDYDF+HOOR:RUOGMDYD • MDYD+HOOR:RUOG • -DYDᴉ⹊ • 䖲㉣ḽ䏦MDYDⲣ‵䣉ⷍ䲦娭僅⚵圊Ʋ • MDYD+HOOR:RUOGMDYD 廍弌ħYHUERVH塾⪝䖲㉣廍弌≝⢉䝺⚵圊僅䲦娭⹊⁋⚵圊䛛㎌Ọ MDYD⑤ị⟞堳⎆⦲䢣˛暽䄝䛲ᷱ⎢㘖䛛㎌⟞堳⎆⦲䢣㩻ƏἭ⯍暂ᷱẴ㘖ℯ䷏孖ḍ ㉱䷏孖㩻⬿⅌姿㆝檻Ə䄝⽳䔘&ODVV/RDGHU 廰⅌⽳⟞堳˛ MDYDħYHUERVH+HOOR:RUOGMDYD 㘩敺 ὦ 䔏廪 ⤁ MDYDF⑤ị⯮⎆⦲䢣MDYD㩻䷏孖ㇷFODVV㩻⽳ⅴỌMDYD⑤ị ⟞堳˛ MDYDF+HOOR:RUOGMDYD MDYDħYHUERVH+HOOR:RUOG 㘩敺 ὦ 䔏廪 ⯸ 㮦⿍濊 • 冣+HOOR:RUOGFODVVⲰ⨖◦濕ḽ䏦 MDYD+HOOR:RUOGMDYD⚵圊㔀㗁䔺䏝 • HUURUFODVVIRXQGRQDSSOLFDWLRQFODVVSDWK+HOOR:RUOG • 曆⫅+HOOR:RUOGFODVV⃨攢 • ᳋㿴⫯䖲㉣ḽ䏦 • MDYD+HOOR:RUOG ᳋⅞‣MDYDℭ㥒⋋ API Specification • https://docs.oracle.com/en/java /javase/11/docs/api/index.html 䧪ᵊ⛀濕壹墡Ʊ宅㑗Ʊ婈㐶 ⑬ 㡀妔 •⑬ 䖬㣗 • ⡀ḓ㍮⪩壹墡 • ⃕₸-DYD䣉ⷍ奜墾䕂 ỉ⚸㗪♉〉 • 婈㐶䕂⩡⌈僅ḽ䏦 • ḽ䏦㔇∅濑3URPRWLRQ濒僅帇♉濑&DVWLQJ濒㽸䣉ⷍ⅞‣壹墡 • 䣉ⷍ奜墾䕂䖬䕂㓭◦僅方値㵛廘 • ㍮⪩䣉ⷍ䕂㓭ᵸ朜濕⽦ᴝ⺃曆䗉む⽦䣉ⷍ䕂⿍◔濕⺃堿䕂㔀ỗ濕⽦⊭ᶣ㽸⽦䕂䣉ⷍ⅞‣奨㓌䧲⻶⟡㜓ᷱ恫㘖ạ桅✏䶔孞䙫壹墡䕂䰎㢉 • ⑬圊壹墡濑6LQJOHOLQHFRPPHQW濒 • ά䰯壹墡 7UDGLWLRQDOFRPPHQW • 㑅ᶴ壹墡濑'RFXPHQWFRPPHQW濒壹墡䕂䰎㢉 • ⑬圊壹墡 public class SingleCommentDemo { public static void main(String[] args) { // 栗䣢Hello炰World炰 System.out.println("Hello炰World炰"); } } 壹墡䕂䰎㢉 • ά䰯壹墡 • ⊆䣯Ƽ⟘圊ƽ壹墡 /*ₚ䵘娢姊 ⏴䨘Ɲ䬓ᷧῲJava䧲⻶䷛侹䛕䙫Ɲ✏垉⸼ᷱ桖䤡HelloƄWorldƄ */ public class TraditionalCommentDemo { public static void main(String[] args) { System.out.println("HelloƄWorldƄ"); } } 壹墡䕂䰎㢉 • ά䰯壹墡㓭ᶣ Ḛ㽸壹墡摉⢉ᶣ弅⃮ Ḛ㽸壹墡䰎㘝 • ᳋⊭ᶣ䏦Ⲡ䅾濑1HVWHG濒䕂㑷ⷍṄ㍮⪩ά䰯壹墡 /* ⎵䧙烉䫔ᶨᾳJava䦳⺷䶜佺 /* 䚖䘬烉⛐坊ⷽᶲ栗䣢Hello炰World炰 */ ⤁棿䙫挖媋 */ 姣妋⇘忁怲⯙䳸㜇Ḯ 壹墡䕂䰎㢉 • 㑅ᶴ壹墡濑'RFXPHQWFRPPHQW濒 • 㑅ᶴ壹墡⺃曆ᶣ㑚䲘⍊‧ỉ㓝唝摉⢉濑濒濕今䏯Ჾ ỉ㓝唝⍊Ჾỉ㑚䲘䰎㘝濑濒Ʋ • 咇䏯-'.‥攂䕂ⲣ‵MDYDGRFṄ䏠䏝㑅ᶴƲ • 䪂ṉ濣MDYDGRFħHQFRGLQJXWI+HOOR:RUOGMDYD 壹墡䕂杦㛺 int numberOfStudent; // ⭟䔆䙫⭟噆 public class HelloWorld { public static void main(String[] args) { ... } // main 䴷㝆 } // HelloWorld䴷㝆壹墡䕂杦㛺 public class HelloWorld { public static void main(String[] args) { // System.out.println("Hello炰烎"); System.out.println("World炰烎"); } } ἧ䓐姣妋姣㴰ᶵ ゛➟埴䘬䦳⺷䡤壹墡䕂杦㛺 public class HelloWorld {ἧ䓐姣妋䘬⎎ᶨ䧖㕡⺷ public static void main(String[] args) { /* System.out.println("Hello炰烎"); System.out.println("Good炰烎"); ....ᶨ⣏➮䦳⺷䡤 */ System.out.println("Hello炰烎"); } } ὦ䔏娢姊娢択ᷧ⯴䧲⻶䢣壹墡䕂杦㛺 /*************************************** * Variable Declaration Section * * 嬲㔠⭋⏲⋨➇ * ****************************************/ 奋娖宅㑗♉〉 • 㐲㐶♉〉濑,QWHJUDOW\SH濒 • E\WHƱVKRUWƱLQW⍊ORQJ • 㰬涜㐶♉〉濑)ORDWLQJSRLQWW\SH濒 • IORDWƱGRXEOH •⨕ ♉〉濑7H[WXDOW\SH濒 • FKDU • 彍巭♉〉濑/RJLFDOW\SH濒 • ERROHDQ 㐲㐶⚸㗪♉〉 ✳ン攟⹎ byte 8 bits short 16 bits 䭬⚵ -27⇘27-1 炷-128⇘127ℙ256ᾳ炸 -215⇘215-1 炷-32,768⇘32767ℙ65,535ᾳ炸 int 32 bits -231⇘231-1 炷-2,147,483,648⇘2,147,483,647ℙ 4,294,967,296ᾳ炸 long 64 bits -263⇘263-1 炷-9,223,372,036,854,775,808⇘ 9,223,372,036,854,775,808 ℙ18,446,744,073,709,557,616ᾳ炸䭬ἳ 2 -114 2 -32699 2 147,334,778 2 -2,036,854,775,808L 1L 㐲㐶⚸㗪♉〉 • 䖲㉣◦䣉ⷍᳫ⪩᳉Ჾỉ㐶Ỻ濕夰㐶Ỻ䣯ᴉ㽸⨕映Ỻ 濑/LWHUDOYDOXH濒 • 䲦娭┦㗁储↓㽸夰㐶Ỻ怋䰤壖ぴ榒䤸摑 • ᶣ㐲㐶Ỻ㽸ṉ濕◦Ჾ僪⾃㭿᳉⡀㙚⽦⪩᳉Ჾỉ㐲㐶濕䲦娭┦⫅储↓士⩘㽸LQW♉〉 • ṉ⡀⪩᳉/䕂夯濕℅䲦娭┦㗁㽸夰㐶Ỻ怋䰤ORQJ ♉〉䕂䤸摑㐲㐶⚸㗪♉〉 Ữ㗗⤪㝄ぐ䘬䦳⺷ᷕ㑘⮓Ḯẍᶳ䘬䦳⺷䇯㭝烉 System.out.println(2036854775808); ⇯ぐ⛐䶐嬗㗪㚫䘤䓇ẍᶳ䘬拗婌妲〗烉 integer number too large: 2036854775808 System.out.println(2036854775808); ^ 1 error 㐲㐶⚸㗪♉〉㐲㐶⚸㗪♉〉 ẍᶳ䘬䦳⺷䡤䇯㭝㚫⛐坊ⷽᶲ栗䣢10忚ỵ䘬255ˣ15冯3烉 System.out.println(0xFF); System.out.println(017); 怙ἴ 怙ἴ System.out.println(0b011); 怙ἴ 㰬涜㐶⚸㗪♉〉 ✳ン攟⹎ 䭬ἳ float 32 bits 99F -327,456,99.01F 4.2E6F炷ⶍ䦳㧁姀姀䁢4.2*106) double 64 bits -1111 2.1E12 999,701,327,456,99.999 ⨕ ⚸㗪♉〉 • FKDU⚸㗪♉〉㓭䏦Ṅ῰⨖ELWV䕂⑬Ჾ⨕ • 8QLFRGH䝺 • ◦-DYD䣉ⷍ奜墾ᳫ濕⨕ ⺃曆ḽ䏦⑬ⷓ唝ㆪḍ System.out.println('Y'); ⨕ ⚸㗪♉〉 • ⊭ᶣḽ䏦8QLFRGH䲦䝺䕂㑷ⷍṄ㇅⩘⨕ ?X摉⢉᳤㇅⩘⨕ 䲦䝺∱⊭ System.out.println('\u0048'); H System.out.println('\u0065'); System.out.println('\u006C'); System.out.println('\u006C'); System.out.println('\u006F'); e l l o 濕⊨堿ᶣ 岱俩⨕ • ハ⾱堿䕂FKDUVLQJOH • 方値奋㽸FKDUVLQJOH • 墡㬸㑷㮓FKDUVLQJOH ? 怀㨊㋮⮁ ⬾K㘖挖䙫 ⏚恱⤁ᷧῲ▕⻼噆奨䔏?㋮⮁巚儒岱俩⨕ ⫿⃫ 䭬ἳ \\ ⍵㕄䶂 \' ╖⺽嘇' \" 暁⺽嘇" \uxxxx ẍ16忚ỵ㔠㊯⭂Unicode⫿⃫廠↢ \dxxx ẍ8忚ỵ㔠㊯⭂Unicode⫿⃫廠↢ \b Ὰ徨ᶨᾳ⫿⃫ \f ㎃枩 \n ㎃埴 \r 㷠㧁䦣军埴椾 \t 嶛㟤(ᶨᾳTab挝) 彍巭⚸㗪♉〉 • ERROHDQ♉〉㗇‧䣬㐶ỺWUXHピIDOVH • ょ䏦㑺㝛ᶴ弉䩕㔀濕弉䩕ⷍ䕂䰎㙚⊭㽸WUXHピ IDOVH ⩡⌈Ʊḽ䏦婈㐶わ曧奨ᷧῲ䩡敺ƏἭ恫ᷴ䟌怺奨㔥Ẃầ溣Ƅ ⩡⌈Ʊḽ䏦婈㐶孱㕟⮊␱䂡わῄ䕀姿㆝檻䩡敺 ⩡⌈Ʊḽ䏦婈㐶 • ⩡⌈Ჾỉ壖ぴ榒䤸摑 • ⌈䚣䲦娭┦廗ỉ䤸摑⫅῰⨖䕂宅㑗㓭ᵾ浺♉〉 • 廗ỉ壖ぴ榒䤸摑㗁㗇ỉ⋋䣯 • 婈㐶䕂⋋䣯㗇⟥⫍⪩ᴉ⃄ 婈㐶䕂⩡⌈僅ḽ䏦 ⛐㕡㱽ᷕ忚埴嬲㔠⭋⏲䘬婆㱽⤪ᶳ烉 type identifier = [value]; int ageOfStudent = 18; char sexOfStudent = 'M'; ⭋⏲᷎㊯⭂ῤ 婈㐶䕂⩡⌈僅ḽ䏦 • ᳋⊭ᶣ䖲㉣⊔䏦婈㐶䕂Ỻ濕䲦娭┦㗁䔺䏝懭奢壈⼭ int ageOfStudent; // ⭋䣢嬲㔠Ữᶵ㊯⭂ῤ System.out.println(ageOfStudent); // 栗䣢嬲㔠わ恫㱹㋮⮁‣䵍⭪⑉ 㔇∅濑3URPRWLRQ濒僅帇♉濑&DVWLQJ濒 ⛐⭋⏲嬲㔠᷎㊯⭂ῤ㗪炻忁㧋⮓ᶵ㚫㚱Ṩ湤⓷柴ˤ int age = 18; double score = 90.5; ⤪㝄ぐ忁湤⭋⏲䘬娙炻䶐嬗☐㚫↢䎦拗婌妲〗烉 int age = 2036854775808; float score = 90.5; 㔇∅濑3URPRWLRQ濒 • ⡀㙚婈㐶䕂宅㑗♉〉‴῰⨖䪂○㪒㇅⩘䕂㐶Ỻᴉ宅㑗♉〉㽸⟥㔀濕℅㗁䔺䏝㐶Ỻ♉〉㔇∅䕂↓Ḛ • 䫟⑬䕂奨濕⫯㓭㐶Ỻ䕂♉〉㗁储↓㊎㓅㽸䧤⋆婈㐶 ᴉ宅㑗♉〉 long money = 10; 帇♉濑&DVWLQJ濒 • ⡀㙚㐶Ỻ䕂宅㑗♉〉ᴉ῰⨖䪂○㪒婈㐶䕂宅㑗♉〉㽸⟥㔀濕䏯㑺≝㐶Ỻ㿟㮓⫅ヾ㗇䕂⩷悍῰⨖傱婈㐶 ᳫ濕▞今䲦娭┦㗁㊎₸懭奢壈⼭ long money = 10; int smallMoney = money; possible loss of precision found : long required: int int smallMoney = money; 帇♉濑&DVWLQJ濒 • ⡀㙚⽦䝸⩘堿⫅宅㑗♉〉⟥䕂Ỻ㇅⩘䰤宅㑗♉〉⫍ 䕂婈㐶濕℅⽦⺃曆㓌䝸廰圊帇♉濑&DVWLQJ濒䕂↓ Ḛ • ḽ䏦ㆪ唝 ⇃ㆪ䖬㣗宅㑗♉〉䕂撚戳⨕ long money = 10; int smallMoney = (int) money; double pi = 3.14159; float piAlso = (float) 3.14; // 廱✳䁢float 帇♉濑&DVWLQJ濒䧪᳇⛀濕-DYD弉䩕⨎ ⑬ 㡀妔 •⑬ 䖬㣗 • 㐶⨶䖶撚䕂䩕圑弉䩕⨎ • 㬸䨔䖶撚䕂撚ẀƱ㝛ᶴ弉䩕⨎ • 唓䋄㐶ḋ彍巭䕂ḋ 弉䩕⨎ • 䫟ṽ⪩㮓䕂㇅⩘弉䩕⨎ 䩕圑弉䩕⨎ • 㣗㵔㐶⨶弉䩕⨎ • 弜❜僅弜㳙弉䩕⨎ • 䩕圑弉䩕僅㔇∅Ʊ帇♉䕂␍朊 +˚-˚*˚/ 㣗㵔㐶⨶弉䩕⨎ 䓐徼忳䬿⫸ 䭬ἳ ≈㱽 + num1 + num2 劍num1䫱㕤10ˣnum2䫱㕤2炻忳䬿䳸㝄䫱㕤12ˤ 㷃㱽 - num1 – num2 劍num1䫱㕤10ˣnum2䫱㕤2炻⇯䳸㝄䫱㕤8ˤ Ḁ㱽 * num1 * num2 劍num1䫱㕤10ˣnum2䫱㕤2炻⇯䳸㝄䫱㕤20ˤ 昌㱽 / num1 / num2 劍num1䫱㕤10ˣnum2䫱㕤2炻⇯䳸㝄䫱㕤5ˤ 㧉㔠炷检昌炸 % num1 % num2 劍num1䫱㕤31ˣnum2䫱㕤6炻⇯䳸㝄䫱㕤1ˤ 㣗㵔㐶⨶弉䩕⨎ • ⡀㙚堿⫅弉䩕䕂䰎㙚㇅⩘䰤㚎婈㐶濕 ℅ḽ䏦㇅⩘弉䩕⨎濑Assignment operator濒= x = 10; ℯ嘼䏭 + 怲䭾⬷ int int y = 5; int sum = x + y; System.out.println(sum); ⅴ嘼䏭 = 怲䭾⬷ 弜❜僅弜㳙弉䩕⨎ • 弜❜弉䩕⨎ int age = 10; age = age + 1; System.out.println(age); // 栗䣢11 ὦ䔏 ++ 恅⢅怲䭾⬷ int age = 10; age++; System.out.println(age); // 札䟸11 弜❜僅弜㳙弉䩕⨎ • 弜㳙弉䩕⨎ int age = 10; age--; System.out.println(age); // 栗䣢 9 弜❜僅弜㳙弉䩕⨎ ∴何⯒㲼 int age = 10; ++age; System.out.println(age); // 栗䣢11 --age; System.out.println(age); // 栗䣢10 弜❜僅弜㳙弉䩕⨎ int age = 10; int var = ++age; 䚠䔞㕤烉 age = age + 1; var = age; int age = 10; int var = age++; 䚠䔞㕤烉 var = age; age = age + 1; 䩕圑弉䩕僅㔇∅Ʊ帇♉䕂␍朊 System.out.println(10 / 3); System.out.println(10.0 / 3); 䴷㞃桖䤡3Ƅᷴ 㛪␎Ƅ 3.3333...ƢƄ 䩕圑弉䩕㔀宅㑗♉〉䕂㔇∅ 䩕圑弉䩕㔀宅㑗♉〉䕂帇♉ • ⽦⊭ᶣ⫅㚎ỉ㐶Ỻ廰圊帇♉濕Ƽㄉ↓ƽ⫅ᴉ㔇∅㽸巁⟥䕂宅㑗♉〉 • ḽ䏦ㆪ唝 ᳤㇅⩘帇♉䕂䖬㣗♉〉撚戳⨕ • System.out.println((double) 10 / 3); 䩕圑弉䩕䩕圑弉䩕䕂悋涜⫯◦㑺濣 *㉊㉊㊟弉㉊㊟弉䩕䕂Ῠ ㊟弉曄ⵍ * 㮦⿍宅㮦㮦⿍宅㑗♉〉撚Ẁ弉䩕⨎Ʊ㝛ᶴ弉䩕⨎ • 撚Ẁ弉䩕⨎濑5HODWLRQDORSHUDWRU濒 • 㓭䏦Ṅ㪒巁‧ỉ㐶Ỻ濕᳤⃢⩘‧仃ᴉ摑䕂⟥⫍撚Ẁ • 㝛ᶴ弉䩕⨎濑&RQGLWLRQDORSHUDWRU濒 • 婑⽦⫋‧ỉ㝛ᶴ廰圊Ƽ᳤᳒ ƽƱƼピ__ƽ䨇⃢㑵撚Ẁ弉䩕⨎ 䉨㱩忳䬿⫸ 䭬ἳ 䚠䫱 == int i = 1; System.out.print( i == 1 ); ᶵ䫱 != int i = 2; System.out.print( i != 1 ); ⮷㕤 < int i = 0; System.out.print( i < 1 ); ⮷㕤䫱㕤 <= int i = 2; System.out.print( i <= 1 ); ⣏㕤 > int i = 1; System.out.print( i > 1 ); ⣏㕤䫱㕤 >= int i = 1; System.out.print( i >= 1 ); 撚Ẁ弉䩕⨎ 㝛ᶴ弉䩕⨎ 忳䬿忳䬿⫸ 䭬ἳ ⤪㝄ᶨᾳ䉨㱩冯⎎ᶨ䉨㱩 ⎴㗪䘤䓇 ᷎ᶼ(and) && int i = 2 ; int j = 8 ; (( i < 1 ) && ( j > 6)) ⤪㝄ᶨᾳ䉨㱩ㆾ⎎ᶨ䉨㱩 ℞ᷕᶨᾳ䘤䓇 ㆾ(or) || int i = 2 ; int j = 8 ; (( i < 1) || ( j > 10)) 朆朆(not) ! int i = 2 ; int j = 8 ; ( ! ( i < 3 )) ḋ 弉䩕⨎ 忳䬿⫸ 㑵ἄ 䭬ἳ & op1 & op2 ⮯op1冯op2䘬㔠ῤ徸ỵ⃫忚埴And忳䬿 | op1 | op2 ⮯op1冯op2䘬㔠ῤ徸ỵ⃫忚埴Or忳䬿 ^ op1 ^ op2 ⮯op1冯op2䘬㔠ῤ徸ỵ⃫忚埴Xor忳䬿 ~ ~op1 ⮯op1㔠ῤ⍾℞墄㔠 DQG 弉䩕⨎ op1 op2 䳸㝄 0 0 0 0 1 0 1 0 0 1 1 1 _ RU 弉䩕⨎ op1 op2 䳸㝄 0 0 0 0 1 1 1 0 1 1 1 1 A [RU 弉䩕⨎ op1 op2 䳸㝄 0 0 0 0 1 1 1 0 1 1 1 0 a垚㐶弉䩕 • LQW♉〉䕂ḋ Ỻょ夰㓭 • • 䱑垚㐶弉䩕⹊婈ノ • ḋ䢹弉䩕⨎ 弉䩕⨎ ⋋䣯䪂ṉ Ḛ䏦䭾㕟ⷍ⹚䧢 RSRS ⯮RS䙫ἴKⷍ䧢RSῲ▕ἴƏ⏚恱壃ᷱ !! 䭾㕟⏚⹚䧢 RS!!RS ⯮RS䙫ἴK⏚䧢RSῲ▕ἴƏⷍ恱壃ᷱ⎆Ὥ㛧ⷍ恱䙫ἴK‣ !!! 恶弖⏚⹚䧢 RS!!!RS ⯮RS䙫ἴK⏚䧢RSῲ▕ἴƏⷍ恱壃ᷱ ḋ䢹弉䩕⨎ ⯮㕟‣怙堳ⷍ䧢㇅⩘弉䩕⨎ 忳䬿⫸ 䭬ἳ ἄ䓐 += op1 += op2 op1 = op1 + op2 -= op1 -= op2 op1 = op1 - op2 *- op1 *= op2 op1 = op1 * op2 /= op1 /= op2 op1 = op1 / op2 %= op1 %= op2 op1 = op1 % op2 &= op1 &= op2 op1 = op1 & op2 |= op1 |= op2 op1 = op1 | op2 ^= op1 ^= op2 op1 = op1 ^ op2 <<= op1 <<= op2 op1 = op1 << op2 >>= op1 >>= op2 op1 = op1 >> op2 >>>= op1 >>>= op2 op1 = op1 >>> op2 弉䩕⨎䕂Ῠ 曄ⵍ • -DYD弉䩕⨎㗪嵩ᴝ㗇储ⲯ䕂弉䩕Ῠ 僇Ჾỉ䫟⑬䕂ṉ⨎濣曄ⵍ濕桔 • [ 㬀[ 濨 • ⹕₸䕂[Ỻ㽸濕今᳋㓭Ʋ廗㓭▞㽸ハỏ徻䚣弑攢⹊⅞㳙䕂撚ẀƲ ᴖ 弉䩕⨎䕂Ῠ 曄ⵍ • 冣⫅朊䖬婈⹕埅斚Ჾ涜 • [ !ħ__! ħ IDOVH • 廗堿⡀ḓ壆䩕⌠濨濨弉䩕⨎䕂Ῠ 曄ⵍ • 㗇Ჾ⫋◑ㆪⷥ䕂弉䩕⨎ • 弜❜⊈弜㳙弉䩕⨎ • ᴖ㮓僅攢㮓弉䩕⨎㓭䏯Ⲥ今⊱Ἐ壆䩕 • ⅞㮓僅㳙㮓弉䩕⨎㓭䏯Ⲥ今⊱Ἐ壆䩕 • Ჾ㣡Ῠ 㧈䕂弉䩕⨎◦Ჾỉ攱庮⊣ᳫ廡䵊◮₸䊼濕 ℅⩁ỏ徻㓭䏯Ⲥ今⊱Ἐ壆䩕弉䩕⨎䕂Ῠ Ῠ 曄ⵍ 曄ⵍ 弉䩕䧤㨡孞 a ⅞ 㳙 !!!!! !! LQVWDQFHRI A _ !! __ " _ A a !! !!! !! ⇯劍䚳䡘 ⍇⇘ 忳䚠䬿⎴ ⺷䘬 ⃒⃰ 䡘⃰ ⇘㪲婘ῤ 炻婘 ⯙ ⃰ ! ⃒ ⃰ 㪲 ῤ 崲 ⮷ 堐䣢崲 ⃰ 塓忳䬿 >@ 弉䩕⨎䕂Ῠ 曄ⵍ • 墡㙎濣 • [ !ħ__! ħ • 䩕 ƱƱƱ䕂䰎㙚 • !__! IDOVH • ⁋䩕Ʊ!Ʊ! 䕂䰎㙚 • WUXH WUXH__WUXH IDOVH • ⁋䩕WUXH WUXH䕂䰎㙚 • WUXH__WUXH • ⁋䩕WUXH IDOVH IDOVH䕂䰎㙚 • WUXH__IDOVH • [ WUXH Module 1, slide 35 of 24 IDOVH 䧪▙⛀濕-DYD㬸䨔㉥⃴ ⑬ 㡀妔 •⑬ 䖬㣗 • ⊔⹕ḽ䏦仃䕂巶‣ • ⶸ䦉LI⍊LIHOVH攱庮 • ḽ䏦VZLWFK攱庮 ⊔⹕ḽ䏦仃巶‣ • ḽ䏦㣗㵔巶‣⊔⹕宅㑗 • ḽ䏦MDYDXWLO6FDQQHU⊔⹕巶‣ ḽ䏦MDYDXWLO6FDQQHU⊔⹕巶‣ java.util.Scanner scanner = new java.util.Scanner(System.in); ⻡䪲ᷧῲ Scanner⯍ὲ ḽ䏦MDYDXWLO6FDQQHU⊔⹕巶‣ import java.util.Scanner; ... Scanner scanner = new Scanner(System.in); ⻡䪲ᷧῲ Scanner⯍ὲ ḽ䏦MDYDXWLO6FDQQHU⊔⹕巶‣ ḽ䏦MDYDXWLO6FDQQHU⊔⹕巶‣ • ḽ䏦⋂䣬QH[W;;; 㑷㮓濑0HWKRG濒⊔⹕⋂䣬♉ 〉䕂宅㑗 • QH[W,QW ⊭⫅ḽ䏦仃巶‣帇㊙㽸LQW♉〉 • QH[W6KRUW ⊭⊔⹕VKRUW♉〉䕂巶‣ • QH[W'RXEOH ⊭⊔⹕GRXEOH♉〉䕂巶‣ • QH[W ⊭⊔⹕6WULQJ♉〉䕂巶‣ • QH[W/LQH ⊭⊔⹕Ჾ⃕宅㑗 ḽ䏦MDYDXWLO6FDQQHU⊔⹕巶‣ • 斄㕤6FDQQHUἧ䓐䘬㕡㱽婒㖶炻⎗㞍娊䶂ᶲ$3,㔯 ẞ • KWWSVGRFVRUDFOHFRPHQMDYDMDYDVHGRFV DSLMDYDEDVHMDYDXWLO6FDQQHUKWPO ḽ䏦MDYDXWLO6FDQQHU⊔⹕巶‣ Scanner scanner = new Scanner(System.in); System.out.print("廠ℍ㔜㔠烉"); int input1 = scanner.nextInt(); System.out.print("廠ℍ㴖溆㔠烉"); double input2 = scanner.nextDouble(); System.out.print("廠ℍⶫ㜿㔠烉"); boolean input3 = scanner.nextBoolean(); ḽ䏦MDYDXWLO6FDQQHU⊔⹕巶‣ • ⡀㙚6FDQQHU㿟㮓⫅ḽ䏦仃䕂巶‣帇㊙㽸㇅⩘䕂宅㑗♉〉濕℅䣉ⷍ⫯㗁䔺䏝 MDYDXWLO,QSXW0LVPDWFK([FHSWLRQ懭奢 ⶸ䦉LI⍊LIHOVH攱庮 LI䰎㢉 if ( boolean_expression ) statement; 乣乳⽧ᷲ⟞堳䧲⻶ if(input % 2 == 0) // ⤪㝄检㔠䁢0 System.out.println(input + " 㗗„㔠"); if(input % 2 != 0) // ⤪㝄检㔠ᶵ䁢0 System.out.println(input + " 㗗⣯㔠"); LI䰎㢉壮⏯晚志⏌Ƌ&RPSRXQGVWDWHPHQWƌƝ if ( boolean_expression ) { code_block; ... } LI䴷Ⱕ 乣乳⽧ᷲ⟞堳䧲⻶ if(input == 36) { System.out.println("〕╄ぐ䋄⮵Ḯ炰"); System.out.println("㔠ῤ䁢 " + 36); } LI䰎㢉 Ⲡ䅾LI䰎㢉 if ( boolean_expression1 ) { code_block1; ... if ( boolean_expression2 ) { code_block2; } // if䳸䳸⯦ ... } // if 䳸⯦ // 两临⼨ᶳ➟埴䦳⺷ Ⲡ䅾LI䰎㢉 if ( boolean_expression ) { code_block_1; } // if䳸䳸㥳䳸⯦ else { code_block_2; } // else 䳸㥳䳸⯦ // 䦳⺷䓙㬌两临 if(input % 2 == 0) { System.out.println(input + " 㗗„㔠"); } else { System.out.println(input + " 㗗⣯㔠"); } LIHOVH䰎㢉抆䅾LIHOVH䰎㢉 if ( boolean_expression_1 ) { code_block_1; } // if䳸㥳䳸⯦ else { if ( boolean_expression_2 ) { code_block_2; } // if䳸㥳䳸⯦ else { code_block_3; } // else 䳸㥳䳸⯦ } // else 䳸㥳䳸⯦ if ( boolean_expression_1 ) { code_block_1; } else if ( boolean_expression_2 ) { code_block_2; } else { code_block_3; ◖Ƅ怀溣⯒⥤ } ₶㷬㥁⤁ṭƄ 抆䅾LIHOVH䰎㢉 if(score >= 90) System.out.println("⼿A"); else if(score >= 80 && score < 90) System.out.println("⼿B"); else if(score >= 70 && score < 80) System.out.println("⼿C"); else if(score >= 60 && score < 70) System.out.println("⼿D"); else System.out.println("⼿E(ᶵ⍲㟤)"); 抆䅾LIHOVH䰎㢉 ⇅⬠侭⎗傥㚫忁湤㑘⮓烉 if ( boolean_expression_1 ) if ( boolean_expression_2 ) ⊇ᷱ劘㋓噆 {} code_block_1; else 忁湤㑘⮓⯙ᶵ㚫㚱䔹ㄖ烉 code_block_2; if ( boolean_expression_1 ) { if ( boolean_expression_2 ) code_block_1; else code_block_2; } ᳇ 弉䩕⨎ int remain = input % 2; System.out.println(input + " 㘖" + ((remain == 0) ? "⁝㕟" : "⤮㕟")); ḽ䏦VZLWFK攱庮 switch ( variable ){ case literal_value: code_block; [break;] case another_literal_value: code_block; [break;] [default:] code_block; } [ ] 塏䤡婙㋮ị⏖Ọ恟㒮『㒗⯒ ḽ䏦VZLWFK攱庮 ḽ䏦VZLWFK攱庮 switch(level) { case 10: case 9: System.out.println("⽾A"); break; case 8: System.out.println("⽾B"); break; case 7: System.out.println("⽾C"); break; case 6: System.out.println("⽾D"); break; default: System.out.println("⽾EƋᷴ⎱㠣ƌ"); } ḽ䏦VZLWFK攱庮 ḓ㔀ḽ䏦VZLWFK䰎㢉 • ᶹḓ䨇ⷍ䕂㥠㳪 • ⑬Ჾ婈㐶䕂⃢㑵濕⡀PRQWK • ⃢㑵Ỻ䕂♉〉㽸LQWƱVKRUWƱE\WHƱFKDUピ 6WULQJ • -DYD摉⢉㏭㊲6WULQJ㥠㳪㉱ level 䭾⇡Ḳ⽳Ⱈ䛛㎌㮻⯴Ə怆⺍廪⿒ ḓ㔀ḽ䏦VZLWFK䰎㢉 int level = score / 10; 㭷ᶨ㫉悥天慵㕘⍾↢score䘬嬲㔠ῤẍ忚埴㭼⮵烉 if(score >= 90) System.out.println("⼿A"); else if(score >= 80 && score < 90) System.out.println("⼿B"); else if(score >= 70 && score < 80) System.out.println("⼿C"); else if(score >= 60 && score < 70) System.out.println("⼿D"); else System.out.println("⼿E(ᶵ⍲㟤)"); switch(level) { case 10: case 9: System.out.println("⽾A"); break; case 8: System.out.println("⽾B"); break; case 7: System.out.println("⽾C"); break; case 6: System.out.println("⽾D"); break; default: System.out.println("⽾E(ᷴ⎱㠣)"); } 䧪ᵒ⛀濕-DYD庲◆㉥⃴ ⑬ 㡀妔 •⑬ 䖬㣗 • ZKLOH庲◆僅GRZKLOH庲◆䕂ḽ䏦 • IRU庲◆䕂ḽ䏦 • EUHDN僅FRQWLQXH䕂ḽ䏦 ZKLOH庲◆ • ERROHDQBH[SUHVVLRQ㓭㗁䏠䏝WUXHピIDOVH䕂弉䩕ⷍƲ◦㪍 Ჾ㧟⚵圊庲◆ᴉℋ徻⺃曆 ⃢ 㑵㨢弉䩕ⷍヾ䏠䏝䕂ⳁ㙕Ỻ • ἅ⡀ERROHDQBH[SUHVVLRQ⃢ 㑵₸Ỻ㓭WUXH濕℅㗁悋埅⚵圊䣉ⷍ䝺⇾✈濑FRGHBEORFN濒 while (boolean_expression) { code_block; } // while䳸⯦ // 䦳⺷⽆忁墉两临 ZKLOH庲◆ int count = 0; // 妰㔠䓐 while(count < input) { // ⇌㕟㫉㔠 System.out.println("HelloロWorldロ"); count++; // 㭷㫉➟埴⼴怆⡆ } ZKLOH庲◆ Ⲡ䅾ZKLOH庲◆ int widthCount = 0; while(widthCount < width) { int lengthCount = 0; while(lengthCount < length) { System.out.print("@");ℏⰌwhile lengthCount++; } System.out.println(); // ㎃埴 widthCount++; } @@@@@@ @@@@ @@@@@@ @@@@ @@@@@@ @@@@ GRZKLOH庲◆ • 冣ERROHDQBH[SUHVVLRQ䕂攱庮⊣㽸WUXH㔀濕℅ FRGHBEORFN⫯㗁坩⁋㧟⚵圊 • ERROHDQBH[SUHVVLRQ㓭㗁䏠䏝WUXHピIDOVH䕂弉䩕ⷍƲ◦ ⚵圊GR⹊今㪍Ჾ㧟悋㑮⚵圊庲◆ᴉℋ徻⺃曆 ⃢㑵㨢弉䩕 ⷍ䕂⚵圊䰎㙚Ʋ do { code_block; } while (boolean_expression); GRZKLOH庲◆ GRZKLOH庲◆ int input = 0; do { System.out.print("廠ℍ㔠⫿ㄆ"); input = scanner.nextInt(); } while(input != 30); System.out.println("〕╄ぐロ䋄⮵Ḯロ"); ḽ䏦IRU庲◆ for徜⚰婆㱽䁢ㄆ for (initialize ; boolean_expression ; update) { code_block; } IRU庲◆ IRU庲◆ for徜⚰婆㱽䁢ㄆ for (initialize ; boolean_expression ; update) { code_block; } ⮎ἄ䭬ἳㄆ for(int i = 0 ; i < input ; i++) { System.out.println("HelloロWorldロ"); } Ⲡ䅾IRU庲◆ for(int i = width; i > 0; i--) { for(int j = length; j > 0; j--) { System.out.print("@"); } System.out.println(); // ㎃埴 } 㪒巁庲◆䕂䰎㢉 • 䐴悋埅䕂㧟㐶᳋䝸⩘᳤᳒⺃曆㳪夤庲◆㝛ᶴ㔀濕 ⫯ḽ䏦ZKLOH庲◆Ʋ • 䐴悋埅䕂㧟㐶᳋䝸⩘᳤᳒⺃曆 ⚵圊㚎ỉ↓Ḛ⹊㳪夤庲◆㝛ᶴ濕⫯ḽ䏦GRZKLOH庲◆Ʋ • IRU庲◆㪒ZKLOH庲◆㖲䫟㸒⊈⩷㓑摯娾濕≝▞㓭▞ 㽸⩁坩士壆ノᶣ⃄摉䕂㐶⨕Ṅ壆㐶Ʋ▞㨢ḽ䏦IRU 庲◆侻⟞ᶣ曎 ⩘乧䕂⚵圊㧟㐶ṄᲾ㨣Ჾ㨣弒ノハ ỏ室ᵆ⩁ỏ䕂ⲣḚƲ ḽ䏦EUHDN while(true) { count++; sum += score; System.out.print("廠ℍ↮㔠(-1䳸㜇)ㄆ"); score = scanner.nextInt(); if(score == -1) break; } ḽ䏦EUHDN ḽ䏦FRQWLQXH for(int i = 1; i < 10; i++) { if(i == 5) continue; System.out.println("i = " + i); } ḽ䏦FRQWLQXH EUHDN㋫怋㣗䬢兯ㆪ唝 { } ⊭⅞ᴝ⊭ᶣ᳋⅞ label1 : { for(int i = 0; i < 10; i++) { if(i == 9) { System.out.println("break label1"); break label1; } } 徜⚰ᷳ⼴➟埴"); System.out.println("for徜 } // label1 ⋨⟲䳸⯦ EUHDN㋫怋㣗䬢 FRQWLQXH㋫怋㣗䬢 label1: for(int i = 0; i < 5; i++){ System.out.println(); label2: for(int j = 0; j < 5; j++) { if(j == 3) { continue label1; } System.out.print("\tj = " + j); } } %%!$ '''!$ %' M

LJ14 JAVA基礎程式設計

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LJ14 JAVA基礎程式設計

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