Java程序設(shè)計(jì) 4章_ppt.txt

1、絎洓绔犵被鐨勬柟娉?瀛︿範(fàn)鐩殑錛?鎺屾彙java鏂規(guī)硶鐨勫垱寤哄拰璋冪敤鎺屾彙閲嶈澆鐔熸?zhèn)塎ath綾?鎺屾彙鍙橀噺浣滅敤鍩?浜嗚В閫掑綊瀛︿範(fàn)閲嶇偣錛?鏂規(guī)硶鐨勫垱寤哄拰璋冪敤閲嶈澆絎洓绔?綾葷殑鏂規(guī)硶鏈珷鎻愯?錛?鏂規(guī)硶鐨勫垱寤哄拰璋冪敤銆€鏂規(guī)硶閲嶈澆銆€Math綾?銆€浣滅敤鍩?銆€閫掑綊4.1鏂規(guī)硶鐨勭畝浠?涓婁竴绔犲凡緇忔彁鍒幫紝涓€涓被鐨勭被浣撴湁鍙橀噺瀹氫箟鍜屾柟娉曞畾涔変袱閮ㄥ垎錛屼笖宸茬粡瀛︿範(fàn)浜嗘瀯閫犳柟娉

2、曠瓑鐗規(guī)畩鐨勪竴浜涙柟娉曘€傛柟娉曠殑瀹氫箟鍙堝寘鎷袱閮ㄥ垎錛氭柟娉曠殑澹版槑鍜屾柟娉曚綋銆備竴鑸牸寮忎負(fù)錛?鏂規(guī)硶鐨勫０鏄庨儴鍒?鏂規(guī)硶浣撶殑鍐呭4.2鏂規(guī)硶鐨勭粨鏋?鏂規(guī)硶鐨勫０鏄庨儴鍒嗘渶鍩烘湰鐨勮鎻忚堪娓呮鏂規(guī)硶鍚嶅拰鏂規(guī)硶鐨勮繑鍥炵被鍨嬨€傚熀鏈牸寮??忎負(fù)錛?[淇グ絎?榪斿洖綾誨瀷鏂規(guī)硶鍚嶏紙[鍙傛暟琛╙錛?鏂規(guī)硶鐨勫悕瀛楀繀欏葷鍚堟爣璇嗙瑙勫垯銆傚湪緇欐柟娉曡搗鍚嶅瓧鏃惰繕搴旈伒寰互涓嬪懡鍚嶄範(fàn)鎯細(xì)鍚嶅瓧濡

3、傛灉浣跨敤鎷変竵瀛楁瘝錛岄?瀛楁瘝灝忓啓錛涘?鏋滃悕瀛楃敱澶氫釜鍗曡瘝緇勬垚錛屽垯浠庣浜屼釜鍗曡瘝寮€濮嬬殑鍏朵粬鍗曡瘝棣栧瓧姣嶄嬌鐢ㄥぇ鍐欏瓧姣嶃€備緥濡傦細(xì)addActionListener絳夈€?鏂規(guī)硶鐨勮繑鍥炵被鍨嬪彲浠ユ椂java浠繪剰鐨勬暟鎹被鍨嬶紝褰撲竴涓柟娉曚笉闇€瑕佽繑鍥炴暟鎹紝榪斿洖綾誨瀷蹇呴』涓簐oid鍏抽敭瀛椼€傚綋涓€涓柟娉曠殑榪斿洖綾誨瀷闈炵┖鐨勮瘽錛屽搴旀柟娉曚綋涓繀欏繪湁return璇彞銆

4、傚綋鏂規(guī)硶鎵ц?瀹宺eturn璇彞鏃舵柟娉曡繑鍥炲埌鏂規(guī)硶琚皟鐢ㄥ銆??寰堝鐨勬柟娉曞０鏄庝腑閮界粰鍑烘柟娉曠殑鍙傛暟錛屽弬鏁頒嬌鐢ㄩ€楀彿闅斿紑鐨勪竴浜涘彉閲忓０鏄?庯紝鍙傛暟涔熷彲浠ヤ負(fù)浠繪剰鐨刯ava鏁版嵁綾誨瀷銆傛瘡涓€涓弬鏁伴渶瑕佸０鏄庡崟鐙殑鏁版嵁綾誨瀷錛屽鈥渋?ntnum1num2鈥濇槸涓嶆紜殑錛?鏂規(guī)硶鐨勫弬鏁拌〃欏瑰簲璇ュ啓涓衡€渋ntnum1intnum2鈥濄€?鏂規(guī)硶鐨勪慨楗扮涔熷寘鎷闂帶鍒朵慨楗扮鍜

5、岄潪璁塊棶鎺у埗淇グ絎︼紝鍩烘湰瑙勫垯璇峰弬鐓т笂涓€绔?.2.3鑺備腑瀵逛慨楗扮鐨勫垎鏋愩€?鏂規(guī)硶浣擄細(xì)鏂規(guī)硶澹版槑涔嬪悗鐨勪竴瀵瑰ぇ鎷彿鈥渰鈥濄€佲€渳鈥濅互鍙?qiáng)瀹冧还嬮棿鐨勫唴蹇U頒綔鏂規(guī)硶鐨勬柟娉曚綋銆傛柟娉曚綋鐨勫唴瀹瑰寘鎷柟娉曠殑灞€閮ㄥ彉閲忓拰鍚堟硶鐨刯ava璇彞銆?濡備笅闈㈢▼搴忎腑甯哥敤鐨刴ain鏂規(guī)硶錛?classTestpublicstaticvoidmain(Stringargs[])Sy

6、stem.out.println(args[0])杈撳嚭鐢ㄦ埛杈撳叆鐨勭涓€涓厓绱?娉ㄦ剰錛歮ain鏂規(guī)硶鍙互鍦ㄦ墽琛岀▼搴忔椂鎺ュ彈閿洏杈撳叆鍐呭浣滀負(fù)鍙傛暟錛堜負(fù)瀛楃涓茬被鍨嬶級錛屽涓嬮潰鐨勬墽琛岃繃紼嬶細(xì)?涓嶅悓鐨勫紩鐢ㄥ彲鑳芥寚鍚戝悓涓€涓璞★紝鎹㈠彞璇濊錛屼竴涓璞″彲浠ユ湁澶氫釜寮曠敤錛屽嵆璇ョ被鍨嬬殑鍙橀噺銆?鐭ラ亾浜嗗紩鐢ㄦ槸浠€涔堜笢瑗匡紝鐜板湪鍒嗘瀽涓€涓嬪璞′綔涓哄弬鏁版槸濡備綍浼犻€掔殑銆傝繕

7、鏄厛浠ヤ竴涓▼搴忎負(fù)渚嬨€?渚?.2錛氬垎鏋愪笅闈㈢▼搴忕殑鎵ц?緇撴灉銆?publicclassTestpublicstaticvoidtest(StringBuffers)s.append(“Wld!“)publicstaticvoidmain(String[]args)StringBufferstring=newStringBuffer(“Hello“)test(string)System.out.println(strin

8、g)榪愯緇撴灉錛??銆€銆€HelloWld!Test綾諱腑璋冪敤浜?test錛圫tringBuffer錛夋柟娉曪紝騫跺皢string浣滀負(fù)鍙傛暟浼犻€掍簡榪涘幓銆傝繖閲?string鏄竴涓紩鐢?紝鑰屽紩鐢ㄦ槸涓€縐嶆暟鎹被鍨嬶紝涓嶆槸瀵硅薄錛屾墍浠ュ畠涓嶅彲鑳芥寜寮曠敤浼犻€掞紝鎵€浠ユ槸鎸夊€間紶閫掔殑錛屼絾寮曠敤鐨勫€兼槸瀵硅薄鐨勫湴鍧€銆備紶閫掔粰s鐨勬槸string鐨勫紩鐢紝鍗硈鏄拰?string瀹屽叏鐩稿悓鐨勫紩鐢ㄥ

9、彞鏌勶紝閮芥寚鍚戜簡鈥渉ello鈥濄€傛晥鏋滃鍥??2鎵€紺恒€?騫朵笖鏄庢樉鍦幫紝閫氳繃寮曠敤s鎴栬€卻tring閮藉彲浠ュ疄鐜板瀛楃涓插唴瀹圭殑淇敼銆?鍥?2浼犲€艱皟鐢?浣嗚嫢鎶婁笂闈㈢殑渚嬪瓙涓殑test鏂規(guī)硶鏀逛負(fù)錛?publicstaticvoidtest(StringBuffers)s=newStringBuffer(“Wld!“)姝ゆ椂鐨勮繍琛岀粨鏋滃垯涓猴細(xì)Hello涓轟粈涔坱est鏂規(guī)硶鏀瑰彉鍓嶅悗杈撳嚭涓嶅

10、悓鍛紵鍥犱負(fù)鍙傛暟?string鏄竴涓紩鐢?紝鍦╯tring浼犻€掔粰s浣嗘湭鎵ц?鈥渟=newStringBuffer(“Wld!“)鈥濇椂錛宻tring鍜宻鐨勬晥鏋滀粛濡傚浘42鎵€紺恒€備絾鎵ц?鈥渟=newStringBuffer(“Wld!“)鈥濆悗錛屽紩鐢╯琚崟鐙噸鏂板垱寤轟簡錛屾敼鍙樹簡s寮曠敤鐨勫€鹼紝浣夸箣鎸囧悜浜嗗彟涓€涓璞€傛鏃秙tring鍜宻鐨勫唴瀛樼姸鎬佸彲琛ㄧず涓哄浘43銆傜敱浜巗tring鍜宻

11、鏄笉鍚岀殑寮曠敤錛宻鐨勬敼鍙樺string灝變笉浼?xì)閫犳垚浠諱綍褰卞搷錛岀粨鏋滃氨濡備緥涓墍紺恒€?鍥?3寮曠敤璋冪敤Java涓紝鏀瑰彉鍙傛暟鐨勫€兼湁涓ょ?鎯呭喌錛岀涓€縐嶏紝浣跨敤璧嬪€煎彿鈥?鈥濈洿鎺ヨ繘琛岃祴鍊間嬌鍏舵敼鍙橈紝濡備緥4.1錛涚浜岀?錛屽浜庢煇浜涘璞＄殑寮曠敤錛屼細(xì)褰卞搷鍒版簮鏁版嵁銆備緥4.2涓璽est鏂規(guī)硶鏀瑰彉鍓嶏紝鍥犱負(fù)寮曠敤鎸囩ず鐨勬煇涓浐瀹氬璞★紝瀵瑰叾鎴愬憳鏁版嵁榪涜鏀瑰彉鍒欏疄璐

12、ㄤ笂鏄敼鍙樼殑璇ュ璞?€?4.4聽鏂規(guī)硶鐨勯噸杞?鏂規(guī)硶閲嶈澆鏄寚涓€涓被涓彲鏈夊?涓柟娉曞叿鏈夌浉鍚岀殑鍚嶅瓧錛屼絾榪欎簺鏂規(guī)硶鐨勫弬鏁板繀欏諱笉鍚岋紝鍗蟲垨鑰呮槸鏂規(guī)硶鐨勫弬鏁頒釜鏁頒笉鍚屻€佹垨鑰呮柟娉曠殑鍙傛暟鐨勭被鍨嬩笉鍚屻€傚鍓嶉潰瀛﹁繃鐨勬瀯閫犳柟娉曪紝涓€涓被鍙互鏈夊涓悓鍚嶆瀯閫犳柟娉曪紝姣忎釜鏋勯€犳??柟娉曞叿鏈変笉鍚岀殑鍙傛暟涓暟鎴栧弬鏁扮被鍨嬶紝鎵€浠ワ紝鍙互榪欐牱璇達(dá)細(xì)鏋勯€犳柟娉曞彲浠ラ