Java 鐨?valueOf() 鏂规硶鐢ㄤ簬灏嗗瓧绗︿覆绛夎浆鎹负鎸囧畾绫诲瀷鐨勫璞°€傚畠鏄潤鎬佹柟娉曪紝鍙互鐩存帴閫氳繃绫诲悕璋冪敤銆?/p>

浠ヤ笅鏄娇鐢?valueOf() 鏂规硶鐨勪竴浜涚ず渚嬶細

1. 灏嗗瓧绗︿覆杞崲涓烘暣鏁帮細

String str = "123";
int num = Integer.valueOf(str);
System.out.println(num); // 杈撳嚭锛?23

2. 灏嗗瓧绗︿覆杞崲涓烘诞鐐规暟锛?/li>

String str = "3.14";
float num = Float.valueOf(str);
System.out.println(num); // 杈撳嚭锛?.14

3. 灏嗗瓧绗︿覆杞崲涓哄竷灏斿€硷細

String str = "true";
boolean bool = Boolean.valueOf(str);
System.out.println(bool); // 杈撳嚭锛歵rue

4. 灏嗗瓧绗︿覆杞崲涓烘灇涓剧被鍨嬶細 鍋囪鏈変竴涓灇涓剧被鍨?Color锛屽叾涓寘鍚簡 RED銆?code>GREEN 鍜?BLUE 涓変釜鍊笺€?/li>

String str = "RED";
Color color = Color.valueOf(str);
System.out.println(color); // 杈撳嚭锛歊ED

璇锋敞鎰忥紝valueOf() 鏂规硶瀵逛簬涓€浜涚被鍨嬶紝濡傚熀鏈暟鎹被鍨嬪拰鍖呰绫伙紝浼氳嚜鍔ㄨ繘琛岀被鍨嬭浆鎹€備絾鏄浜庢灇涓剧被鍨嬫潵璇达紝蹇呴』浼犲叆涓庢灇涓惧父閲忓悕瀹屽叏鍖归厤鐨勫瓧绗︿覆锛屽惁鍒欎細鎶涘嚭 IllegalArgumentException 寮傚父銆?/p>