鈥?strong>鈥嬧€滀簩缁存暟缁勫垵濮嬪寲鎬绘姤閿欙紵浠婂ぉ鎵嬫妸鎵嬫暀浣犱粠涓€缁寸帺鍒板缁达紝浠ｇ爜鐩存帴璐村埌椤圭洰閲岀敤锛佲€濃€?/strong>鈥?br/> 鍒氬Java鐨勪紮璁′滑锛屾湁娌℃湁閬囧埌杩囪繖浜涙儏鍐碉細

• 涓€缁存暟缁勫媺寮轰細鐢紝浜岀淮鐩存帴鎳靛湀
• 鏄庢槑鐓х潃鏁欑▼鍐欎唬鐮侊紝鍗寸柉鐙傛姤NullPointerException
• 鍔ㄦ€佸垵濮嬪寲鐨勬暟缁勯暱搴︽€诲涓嶄笂
  鍒€ワ紝杩欑瘒灏卞甫浣犵敤鏈€绗ㄤ絾鏈€鏈夋晥鐨勬柟娉曪紝褰诲簳鎼炴噦鏁扮粍鎬庝箞鐜╋紒

鈥?strong>鈥嬩竴銆佷竴缁存暟缁勶細鍏堝浼氳蛋璺啀璺戞鈥?/strong>鈥?/h3>

鈥?strong>鈥嬧€滀竴缁存暟缁勯兘涓嶇啛锛熷挶浠厛鏉ユ淇濆懡鎿嶄綔锛佲€濃€?/strong>鈥?br/> 鈥?strong>鈥嬫楠?锛氬０鏄庢暟缁勨€?/strong>鈥?/p>

java澶嶅埗
String[] phoneBrands;      // 鍙０鏄庝笉鍒濆鍖栵紙姝ゆ椂=null锛岀敤浜嗗氨鎶ラ敊锛侊級
int[] numbers = new int[3]; // 澹版槑+鍔ㄦ€佸垵濮嬪寲锛堥粯璁ゅ€煎叏鏄?锛?/span>

鈥?strong>鈥嬮噸鐐硅鍛婏細鈥?/strong>鈥?/p>

• 娌″垵濮嬪寲鐨勬暟缁勪笉鑳界洿鎺ョ敤锛侊紙鏂版墜蹇呰俯鍧戯級
• 鍔ㄦ€佸垵濮嬪寲鍚庢瘡涓綅缃兘鏈夐粯璁ゅ€硷紝姣斿int鏄?锛?code>boolean鏄痜alse

鈥?strong>鈥嬫楠?锛氬鏁版嵁鈥?/strong>鈥?/p>

java澶嶅埗
numbers[0] = 10;  // 姝ｇ‘濮垮娍
// numbers[3] = 20;  鈫?瓒婄晫鎶ラ敊锛佹暟缁勯暱搴?锛屼笅鏍囨渶澶у埌2

鈥?strong>鈥嬫楠?锛氶潤鎬佸垵濮嬪寲鍋锋噿娉曗€?/strong>鈥?/p>

java澶嶅埗
String[] cities = {"鍖椾含", "涓婃捣", "骞垮窞"}; // 涓嶇敤鍐欓暱搴︼紝鑷姩绠?/span>
// String[] cities = new String[]{"鍖椾含","涓婃捣"}; 鈫?鍙︿竴绉嶅啓娉曪紙鑰冭瘯棰樼埍鑰冿級

---

鈥?strong>鈥嬩簩銆佷簩缁存暟缁勶細濂楀▋鐨勬纭Э鍔库€?/strong>鈥?/h3>

鈥?strong>鈥嬧€滀簩缁存暟缁勪笉灏辨槸鏁扮粍閲屽鏁扮粍锛熷锛屼絾90%鏂版墜閮芥牻鍦ㄨ繖鍎匡紒鈥濃€?/strong>鈥?/p>

鈥?strong>鈥嬪満鏅?锛氳鍒欑煩褰㈡暟缁勶紙姣斿鐭╅樀锛夆€?/strong>鈥?/h4>

java澶嶅埗
// 鍔ㄦ€佸垵濮嬪寲锛?琛?鍒?/span>
int[][] matrix = new int[3][2];  
matrix[0][0] = 1;  // 绗竴琛岀涓€鍒?/span>
matrix[1][1] = 5;  // 绗簩琛岀浜屽垪

鈥?strong>鈥嬪満鏅?锛氫笉瑙勫垯鏁扮粍锛堝悇琛岄暱搴︿笉鍚岋級鈥?/strong>鈥?/h4>

java澶嶅埗
// 鍏堝紑3琛岀殑绌洪棿锛屾瘡琛屽崟鐙垵濮嬪寲
String[][] students = new String[3][];  
students[0] = new String[]{"寮犱笁", "鏉庡洓"};     // 绗竴琛?浜?/span>
students[1] = new String[]{"鐜嬩簲"};            // 绗簩琛?浜?/span>
students[2] = new String[3];                  // 绗笁琛岀┖3涓綅缃紙榛樿null锛?/span>

鈥?strong>鈥嬬粡鍏哥炕杞︾幇鍦哄垎鏋愨€?/strong>鈥?/h4>

java澶嶅埗
int[][] arr = new int[3][];  
System.out.println(arr[0][0]); // 鎶ullPointerException锛?/span>

鈥?strong>鈥嬩负浠€涔堬紵鈥?/strong>鈥?/p>

• 鍙紑浜嗚鐨勭┖闂达紝娌″垵濮嬪寲鍒楋紒锛堢浉褰撲簬3涓猲ull鏁扮粍锛?/li>

---

鈥?strong>鈥嬩笁銆佸缁存暟缁勯€氱敤濂楄矾锛氶€愬眰鐮撮槻鈥?/strong>鈥?/h3>

鈥?strong>鈥嬧€滀笁缁存暟缁勬€庝箞鐜╋紵鏃犻潪鏄濂椾竴灞傦紒鈥濃€?/strong>鈥?br/> 浠ヤ笁缁存暟缁勪负渚嬶紙姣斿绔嬩綋鍧愭爣绯伙級锛?/p>

java澶嶅埗
// 鍔ㄦ€佸垵濮嬪寲锛?灞?琛?鍒?/span>
int[][][] space = new int[2][3][4];  
space[0][1][2] = 100; // 绗?灞傜2琛岀3鍒?/span>

// 闈欐€佸垵濮嬪寲娣锋惌椋?/span>
String[][][] data = {
    {{"A1", "A2"}, {"B1"}},    // 绗竴灞?/span>
    {{"C1"}, {"D1", "D2", "D3"}}  // 绗簩灞?/span>
};

鈥?strong>鈥嬪疄鐢ㄦ妧宸э細鈥?/strong>鈥?/p>

1. 鈥?strong>鈥嬮暱搴︽煡鐪嬪彛璇€鈥?/strong>鈥嬶細
   • array.length 鈫?褰撳墠缁村害闀垮害
   • array[0].length 鈫?涓嬩竴缁撮暱搴︼紙鍓嶆彁鏄痑rray[0]宸插垵濮嬪寲锛侊級
2. 鈥?strong>鈥嬮亶鍘嗕竾鑳芥ā鏉库€?/strong>鈥嬶細

java澶嶅埗
for (int i=0; ifor (int j=0; j// 浜岀淮鎿嶄綔
        for (int k=0; k// 涓夌淮缁х画濂?
            // ... 
        }
    }
}

---

鈥?strong>鈥嬪洓銆佷竴缁?vs 澶氱淮鍒濆鍖栧姣旇〃鈥?/strong>鈥?/h3>

鈥?strong>鈥嬪姣旈」鈥?/strong>鈥?/th>	涓€缁存暟缁?/th>	澶氱淮鏁扮粍
鈥?strong>鈥嬪唴瀛樼粨鏋勨€?/strong>鈥?/td>	鍗曞眰杩炵画绌洪棿	宓屽寮曠敤锛堢被浼间縿缃楁柉濂楀▋锛?/td>
鈥?strong>鈥嬮粯璁ゅ€奸闄┾€?/strong>鈥?/td>	鐩存帴璧?/false/null	鍐呭眰鏁扮粍涓嶅垵濮嬪寲灏辨槸null锛堟瀬鏄撶┖鎸囬拡锛侊級
鈥?strong>鈥嬮€傜敤鍦烘櫙鈥?/strong>鈥?/td>	绠€鍗曟暟鎹垪琛紙濡傛垚缁╁崟锛?/td>	琛ㄦ牸鏁版嵁锛堝Excel锛夈€佺┖闂村潗鏍囥€佹爲鐘剁粨鏋?/td>
鈥?strong>鈥嬫柊浜哄弸濂藉害鈥?/strong>鈥?/td>	猸愨瓙猸愨瓙猸?/td>	猸愨瓙锛堝缓璁厛缁冪啛涓€缁村啀纰帮級

---

鈥?strong>鈥嬩釜浜鸿俯鍧戠粡楠屽垎浜€?/strong>鈥?/h3>

1. 鈥?strong>鈥嬪缁存暟缁勫埆璐鈥?/strong>鈥嬶細
   椤圭洰閲岀湡鐢ㄥ緱鍒颁笁缁翠互涓婄殑鎯呭喌涓嶅埌10%锛屽己琛屼笂涓夌淮鍙細璁╁悓浜嬫兂鎵撲汉
2. 鈥?strong>鈥嬮潤鎬佸垵濮嬪寲浼樺厛鍘熷垯鈥?/strong>鈥嬶細
   鑳戒竴鐪肩湅娓呯粨鏋勬椂锛屽敖閲忕敤{{},{}}鍐欐硶锛屾瘮濡傦細

   java澶嶅埗
   // 杩欐牱鍐欐瘮鍔ㄦ€佸垵濮嬪寲娓呮櫚10鍊嶏紒
   String[][] emojis = {
       {"馃槉", "馃槀"}, 
       {"馃惗", "馃惐"}
   };

3. 鈥?strong>鈥嬮亣鍒癗ullPointerException鎬庝箞鍔炩€?/strong>鈥嬶細
   鍏堟鏌ユ槸涓嶆槸鏌愬眰鏁扮粍娌″垵濮嬪寲锛岃€屼笉鏄€ョ潃鏀逛唬鐮侊紒锛堣娉暀璁級

鈥?strong>鈥嬫渶鍚庣伒榄傛毚鍑伙細鈥滅湅瀹岃繕鏄笉浼氬啓锛熸墦寮€IDE鎶婃枃涓殑浠ｇ爜鍏ㄦ暡涓€閬嶏紝鍖呬綘椤挎偀锛佲€濃€?/strong>鈥?/p>

锛堝叏鏂囧畬锛?/p>

本文由嘻道妙招独家原创，未经允许，严禁转载