{"id":19352,"date":"2017-03-14T19:13:29","date_gmt":"2017-03-14T10:13:29","guid":{"rendered":"http:\/\/www.sejuku.net\/blog\/?p=19352"},"modified":"2024-05-06T11:40:49","modified_gmt":"2024-05-06T02:40:49","slug":"%e3%80%90java%e5%85%a5%e9%96%80%e3%80%91string%e3%81%ae%e5%a4%89%e6%8f%9b%e6%96%b9%e6%b3%95%e3%81%be%e3%81%a8%e3%82%81","status":"publish","type":"post","link":"https:\/\/www.sejuku.net\/blog\/19352","title":{"rendered":"Java\u3067String\uff08\u6587\u5b57\u5217\uff09\u3092\u5909\u63db\u3059\u308b\u65b9\u6cd5\u307e\u3068\u3081\uff08short,int,long\u7b49\u306b\u5909\u63db\uff09"},"content":{"rendered":"

Java\u3067String\u578b\u3068\u6574\u6570\u578b\uff08short,int,long\uff09\u306e\u5909\u63db\u65b9\u6cd5\u304c\u77e5\u308a\u305f\u3044
\nString\u578b\u3068\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\uff08float,double\uff09\u306e\u5909\u63db\u65b9\u6cd5\u304c\u77e5\u308a\u305f\u3044
\nString\u578b\u3068\u65e5\u4ed8\u578b\u306e\u5909\u63db\u65b9\u6cd5\u304c\u77e5\u308a\u305f\u3044<\/div><\/p>\n

Java\u306eString\u3092\u6271\u3046\u4e0a\u3067\u3001\u6587\u5b57\u5217\u3092\u6570\u5024\u578b\u306a\u3069\u306b\u5909\u63db\u3059\u308b\u3068\u3044\u3063\u305f\u5bfe\u5fdc\u304c\u5fc5\u8981\u306a\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002Java\u3067\u306fString\u578b\u3092\u3055\u307e\u3056\u307e\u306a\u578b\u306b\u5909\u63db\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n

\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001String\u304b\u3089\u6574\u6570\u578b\u3084\u4ed6\u306e\u578b\u3078\u5909\u63db\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u7db2\u7f85\u7684\u306b\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n

\u306a\u304a\u3001Java\u306e\u8a18\u4e8b\u306b\u3064\u3044\u3066\u306f\u3001\u3053\u3061\u3089<\/a>\u306b\u307e\u3068\u3081\u3066\u3044\u307e\u3059\u3002<\/p>\n

String\u3068\u6574\u6570\u5024\u306e\u5909\u63db<\/h2>\n

String\u578b\u3068\u6574\u6570\u578b\u306e\u76f8\u4e92\u5909\u63db\u306e\u30e1\u30bd\u30c3\u30c9\u3001\u66f8\u304d\u65b9\u306b\u3064\u3044\u3066\u8868\u306b\u307e\u3068\u3081\u307e\u3057\u305f\u3002<\/p>\n\n\n\n\n\t\n\n\t\n\t\n\t\n\t\n\t\n\t\n\t
\u5909\u63db\u524d\u306e\u578b<\/th>\u5909\u63db\u5f8c\u306e\u578b<\/th>\u30e1\u30bd\u30c3\u30c9<\/th>\u66f8\u304d\u65b9\u4f8b<\/th>\n<\/tr>\n<\/thead>\n
String<\/td>int<\/td>Integer.parseInt
\nInteger.valueOf<\/td>		Integer.parseInt(\"1\")
\nInteger.valueOf(\u201c1\u201d)
\n<\/td>\n<\/tr>\n
short<\/td>Short.parseShort
\nShort.valueOf<\/td>		Short.parseShort(\u201c1\u201d)
\nShort.valueOf(\u201c1\u201d)<\/td>\n<\/tr>\n
long<\/td>Long.parseLong
\nLong.valueOf<\/td>		Long.parseLong(\u201c1\u201d)
\nLong.valueOf(\u201c1\u201d)<\/td>\n<\/tr>\n
\u6574\u6570\u5024\u578b(int, short, long)<\/td>String<\/td>String.valueOf<\/td>String.valueOf(1)<\/td>\n<\/tr>\n
int<\/td>String<\/td>Integer.toString<\/td>Integer.toString(1)<\/td>\n<\/tr>\n
short<\/td>String<\/td>Short.toString<\/td>Short.toString((short)1)<\/td>\n<\/tr>\n
long<\/td>String<\/td>Long.toString<\/td>Long.toString(1l)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n

String\u578b\u304b\u3089\u6574\u6570\u578b\u3078\u306e\u5909\u63db\u306fparseInteger\u3001paraseShort\u3001parseLong\u306a\u3069\u306e\u30e1\u30bd\u30c3\u30c9\u3084valueOf\u30e1\u30bd\u30c3\u30c9\u304c\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002<\/p>\n

\u6574\u6570\u578b\u304b\u3089\u6587\u5b57\u5217\u578b\u3078\u306e\u5909\u63db\u306fvalueOf\u30e1\u30bd\u30c3\u30c9\u3084toString\u30e1\u30bd\u30c3\u30c9\u304c\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002<\/p>\n

\u305d\u308c\u305e\u308c\u306e\u4f7f\u7528\u4f8b\u306b\u3064\u3044\u3066\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u78ba\u8a8d\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n

short\u3068String<\/h3>\n

short\u304b\u3089String\u3078\u306e\u5909\u63db<\/h4>\n

short\u306e\u5024\u3092String\u3078\u5909\u63db\u3059\u308b\u5834\u5408\u306f\u3001valueOf\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n

valueOf\u30e1\u30bd\u30c3\u30c9\u306e\u5f15\u6570\u306b\u3001short\u306e\u5024\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n

public class Main {\r\n \r\n    public static void main(String[] args) {\r\n        short sh = 100;\r\n        String str = String.valueOf(sh);\r\n        System.out.println(\"str\uff1a\" + str);\r\n    }\r\n\r\n}<\/pre>\n
\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n
str\uff1a100<\/pre>\n
String\u304b\u3089short\u3078\u306e\u5909\u66f4<\/h4>\n
String\u304b\u3089short\u3078\u5909\u63db\u3059\u308b\u5834\u5408\u306f\u3001parseShort\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\u5f15\u6570\u306b\u6587\u5b57\u5217\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n
public class Main {\r\n \r\n    public static void main(String[] args) {\r\n        String str = \"100\";\r\n        short sh = Short.parseShort(str);\r\n        System.out.println(\"sh : \" + sh);\r\n    }\r\n\r\n}<\/pre>\n
\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n
sh : 100<\/pre>\n
int\u3068String<\/h3>\n
int\u304b\u3089Stirng\u3078\u306e\u5909\u63db<\/h4>\n
int\u306e\u5024\u3092String\u3078\u5909\u63db\u3059\u308b\u5834\u5408\u306f\u3001valueOf\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n
valueOf\u30e1\u30bd\u30c3\u30c9\u306e\u5f15\u6570\u306b\u3001int\u306e\u5024\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n
public class Main {\r\n \r\n    public static void main(String[] args) {\r\n        int num = 100;\r\n        String str = String.valueOf(num);\r\n        System.out.println(\"str : \" + str);\r\n    }\r\n\r\n}<\/pre>\n
\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n
str : 100<\/pre>\n
String\u304b\u3089int\u3078\u306e\u5909\u63db<\/h4>\n
String\u304b\u3089int\u3078\u5909\u63db\u3059\u308b\u5834\u5408\u306f\u3001parseInt\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\u5f15\u6570\u306b\u6587\u5b57\u5217\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n
public class Main {\r\n \r\n    public static void main(String[] args) {\r\n        String str = \"100\";\r\n        int num = Integer.parseInt(str);\r\n        System.out.println(\"num : \" + num);\r\n    }\r\n\r\n}<\/pre>\n
\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n
num : 100<\/pre>\n
long\u3068String<\/h3>\n
long\u304b\u3089String\u3078\u306e\u5909\u63db<\/h4>\n
long\u306e\u5024\u3092String\u3078\u5909\u63db\u3059\u308b\u5834\u5408\u306f\u3001valueOf\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n
valueOf\u30e1\u30bd\u30c3\u30c9\u306e\u5f15\u6570\u306b\u3001long\u306e\u5024\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n
public class Main {\r\n \r\n    public static void main(String[] args) {\r\n        long lon = 100;\r\n        String str = String.valueOf(lon);\r\n        System.out.println(\"str : \" + str);\r\n    }\r\n\r\n}<\/pre>\n
\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n
str : 100<\/pre>\n
String\u304b\u3089long\u3078\u306e\u5909\u63db<\/h4>\n
String\u304b\u3089long\u3078\u5909\u63db\u3059\u308b\u5834\u5408\u306f\u3001parseLong\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\u5f15\u6570\u306b\u6587\u5b57\u5217\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n
public class Main {\r\n \r\n    public static void main(String[] args) {\r\n        String str = \"100\";\r\n        long lon = Long.parseLong(str);\r\n        System.out.println(\"lon : \" + lon);\r\n    }\r\n\r\n}<\/pre>\n
\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n
lon : 100<\/pre>\n
String\u3068\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u306e\u5909\u63db<\/h2>\n
String\u578b\u3068\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u306e\u76f8\u4e92\u5909\u63db\u306e\u30e1\u30bd\u30c3\u30c9\u3001\u66f8\u304d\u65b9\u306b\u3064\u3044\u3066\u8868\u306b\u307e\u3068\u3081\u307e\u3057\u305f\u3002<\/p>\n\n\n\n\n\t\n\n\t\n\t\n\t\n\t\n\t
\u5909\u63db\u524d\u306e\u578b<\/th>\u5909\u63db\u5f8c\u306e\u578b<\/th>\u30e1\u30bd\u30c3\u30c9<\/th>\u66f8\u304d\u65b9\u4f8b<\/th>\n<\/tr>\n<\/thead>\n
String<\/td>float<\/td>Float.parseFloat
\nFloat.valueOf<\/td>		Float.parseFloat(\u201c1\u201d)
\nFloat.valueOf(\u201c1\u201d)<\/td>\n<\/tr>\n
double<\/td>Double.parseDouble
\nDouble.valueOf<\/td>		Double.parseDouble(\u201c1\u201d)
\nDouble.valueOf(\u201c1\u201d)
\n<\/td>\n<\/tr>\n
\u5c0f\u6570\u70b9\u6570\u578b(float, double)<\/td>String<\/td>String.valueOf<\/td>String.valueOf(1)<\/td>\n<\/tr>\n
float<\/td>String<\/td>Float.toString<\/td>Float.toString(1.0f)<\/td>\n<\/tr>\n
double<\/td>String<\/td>Double.toString<\/td>Double.toString(1.0)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n
String\u578b\u304b\u3089\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u3078\u306e\u5909\u63db\u306fparseFloat\u3001parseDouble\u306a\u3069\u306e\u30e1\u30bd\u30c3\u30c9\u3084valueOf\u30e1\u30bd\u30c3\u30c9\u304c\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u304b\u3089\u6587\u5b57\u5217\u578b\u3078\u306e\u5909\u63db\u306fvalueOf\u30e1\u30bd\u30c3\u30c9\u3084toString\u30e1\u30bd\u30c3\u30c9\u304c\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u305d\u308c\u305e\u308c\u306e\u4f7f\u7528\u4f8b\u306b\u3064\u3044\u3066\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u78ba\u8a8d\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n
float\u3068String<\/h3>\n
float\u304b\u3089String\u3078\u306e\u5909\u63db<\/h4>\n
float\u306e\u5024\u3092String\u3078\u5909\u63db\u3059\u308b\u5834\u5408\u306f\u3001valueOf\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n
valueOf\u30e1\u30bd\u30c3\u30c9\u306e\u5f15\u6570\u306b\u3001float\u306e\u5024\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n
public class Main {\r\n \r\n    public static void main(String[] args) {\r\n        float fl = 100;\r\n        String str = String.valueOf(fl);\r\n        System.out.println(\"str : \" + str);\r\n    }\r\n\r\n}<\/pre>\n
\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n
str : 100.0<\/pre>\n
String\u304b\u3089float\u3078\u306e\u5909\u63db<\/h4>\n
String\u304b\u3089float\u3078\u5909\u63db\u3059\u308b\u5834\u5408\u306f\u3001parseFloat\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\u5f15\u6570\u306b\u6587\u5b57\u5217\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n
public class Main {\r\n \r\n    public static void main(String[] args) {\r\n        String str = \"100\";\r\n        float fl = Float.parseFloat(str);\r\n        System.out.println(\"fl : \" + fl);\r\n    }\r\n\r\n}<\/pre>\n
\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n
fl : 100.0<\/pre>\n
double\u3068String<\/h3>\n
double\u304b\u3089String\u3078\u306e\u5909\u63db<\/h4>\n
double\u306e\u5024\u3092String\u3078\u5909\u63db\u3059\u308b\u5834\u5408\u306f\u3001valueOf\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n
valueOf\u30e1\u30bd\u30c3\u30c9\u306e\u5f15\u6570\u306b\u3001double\u306e\u5024\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n
public class Main {\r\n \r\n    public static void main(String[] args) {\r\n        double db = 100;\r\n        String str = String.valueOf(db);\r\n        System.out.println(\"str : \" + str);\r\n    }\r\n\r\n}<\/pre>\n
\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n
str : 100.0<\/pre>\n
String\u304b\u3089double\u3078\u306e\u5909\u63db<\/h4>\n
String\u304b\u3089double\u3078\u5909\u63db\u3059\u308b\u5834\u5408\u306f\u3001parseDouble\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\u5f15\u6570\u306b\u6587\u5b57\u5217\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n
public class Main {\r\n \r\n    public static void main(String[] args) {\r\n        String str = \"100\";\r\n        double db = Double.parseDouble(str);\r\n        System.out.println(\"db : \" + db);\r\n    }\r\n\r\n}<\/pre>\n
\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n
db : 100.0<\/pre>\n
String\u3068boolean\u306e\u5909\u63db<\/h2>\n
String\u578b\u3068\u771f\u507d\u5024\u306e\u76f8\u4e92\u5909\u63db\u306e\u30e1\u30bd\u30c3\u30c9\u3001\u66f8\u304d\u65b9\u306b\u3064\u3044\u3066\u8868\u306b\u307e\u3068\u3081\u307e\u3057\u305f\u3002<\/p>\n\n\n\n\n\t\n\n\t\n\t
\u5909\u63db\u524d\u306e\u578b<\/th>\u5909\u63db\u5f8c\u306e\u578b<\/th>\u30e1\u30bd\u30c3\u30c9<\/th>\u66f8\u304d\u65b9\u4f8b<\/th>\n<\/tr>\n<\/thead>\n
String<\/td>boolean<\/td>Boolean.valueOf<\/td>Boolean.valueOf(\u201ctrue\u201d)<\/td>\n<\/tr>\n
boolean<\/td>String<\/td>String.valueOf<\/td>String.valueOf(true)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n
String\u578b\u304b\u3089\u771f\u507d\u5024\u3078\u306e\u5909\u63db\u306fvalueOf\u30e1\u30bd\u30c3\u30c9\u304c\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u771f\u507d\u5024\u304b\u3089\u6587\u5b57\u5217\u578b\u3078\u306e\u5909\u63db\u306fvalueOf\u30e1\u30bd\u30c3\u30c9\u304c\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u305d\u308c\u305e\u308c\u306e\u4f7f\u7528\u4f8b\u306b\u3064\u3044\u3066\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u78ba\u8a8d\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n
boolean\u304b\u3089String\u3078\u306e\u5909\u63db<\/h4>\n
boolean\u306e\u5024\u3092String\u3078\u5909\u63db\u3059\u308b\u5834\u5408\u306f\u3001valueOf\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n
valueOf\u30e1\u30bd\u30c3\u30c9\u306e\u5f15\u6570\u306b\u3001boolean\u306e\u5024(true or false)\u3092\u6307\u5b9a\u3057\u307e\u3059<\/p>\n
public class Main {\r\n \r\n    public static void main(String[] args) {\r\n        boolean bool1 = true;\r\n        boolean bool2 = false;\r\n        String str1 = String.valueOf(bool1);\r\n        String str2 = String.valueOf(bool2);\r\n         \r\n        System.out.println(\"str1 : \" + str1);   \r\n        System.out.println(\"str2 : \" + str2);\r\n    }\r\n\r\n}<\/pre>\n
\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n
str1 : true\r\nstr2 : false<\/pre>\n
String\u304b\u3089boolean\u3078\u306e\u5909\u63db<\/h4>\n
String\u304b\u3089boolean\u3078\u5909\u63db\u3059\u308b\u5834\u5408\u306f\u3001valueOf\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\u5f15\u6570\u306b\u6587\u5b57\u5217\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n
public class Main {\r\n \r\n    public static void main(String[] args) {\r\n        String str1 = \"true\";\r\n        String str2 = \"false\";\r\n        boolean bool1 = Boolean.valueOf(str1);\r\n        boolean bool2 = Boolean.valueOf(str2);\r\n                \r\n        System.out.println(\"bool1 : \" + bool1);\r\n        System.out.println(\"bool2 : \" + bool2);\r\n    }\r\n\r\n}<\/pre>\n
\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n
bool1 : true\r\nbool2 : false<\/pre>\n
valueOf\u30e1\u30bd\u30c3\u30c9\u306b\u6307\u5b9a\u3059\u308b\u6587\u5b57\u5217\u306f\u3001\u771f\u507d\u5024(true\u3001false)\u3067\u3059\u304c\u3001\u771f\u507d\u5024\u4ee5\u5916\u306e\u6587\u5b57\u5217\u3092\u6307\u5b9a\u3059\u308b\u3068\u3001false\u304c\u8fd4\u3055\u308c\u307e\u3059\u3002<\/p>\n
String\u3068Date\u306e\u5909\u63db<\/h2>\n
Date\u304b\u3089String\u3078\u306e\u5909\u63db<\/h4>\n
Date\u306e\u5024\u3092String\u3078\u5909\u63db\u3059\u308b\u5834\u5408\u306f\u3001valueOf\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n
valueOf\u30e1\u30bd\u30c3\u30c9\u306e\u5f15\u6570\u306b\u3001Date\u306e\u5024\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n
import java.util.Date;\r\n\r\npublic class Main {\r\n \r\n    public static void main(String[] args) {\r\n        Date d = new Date();\r\n        String str = String.valueOf(d);\r\n        System.out.println(\"str : \" + str);\r\n    }\r\n\r\n}<\/pre>\n
\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n
str : Tue Mar 07 02:19:03 UTC 2017<\/pre>\n
String\u304b\u3089Date\u3078\u306e\u5909\u63db<\/h4>\n
String\u304b\u3089data\u3078\u5909\u63db\u3059\u308b\u5834\u5408\u306f\u3001\u307e\u305aSimpleDateFormat\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3057\u3066\u3001\u65e5\u4ed8\u6642\u523b\u306e\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n
\u305d\u306e\u3042\u3068\u306b\u3001parse\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u5f15\u6570\u306b\u6587\u5b57\u5217\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n
import java.text.ParseException;\r\nimport java.text.SimpleDateFormat;\r\nimport java.util.Date;\r\n\r\npublic class Main {\r\n \r\n    public static void main(String[] args) {\r\n        String str = \"20170307 12:00:00\";\r\n        SimpleDateFormat sd = new SimpleDateFormat(\"yyyyMMdd HH:mm:ss\");\r\n        try {\r\n            Date d = sd.parse(str);\r\n            System.out.println(\"d : \" + d.toString());\r\n        } catch(ParseException e) {\r\n            e.printStackTrace();\r\n        }\r\n    }\r\n\r\n}<\/pre>\n
\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n
d : Tue Mar 07 12:00:00 UTC 2017<\/pre>\n
parse\u30e1\u30bd\u30c3\u30c9\u3067String\u578b\u3092data\u578b\u306b\u5909\u63db\u3059\u308b\u3068\u304d\u306b\u3001String\u306e\u5024\u304cSimpleDateFormat\u30af\u30e9\u30b9\u3067\u6307\u5b9a\u3057\u305f\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u4ee5\u5916\u306e\u6587\u5b57\u5217\u3092\u6307\u5b9a\u3057\u305f\u5834\u5408\u3001\u201djava.text.ParseException\u201d\u306e\u4f8b\u5916\u304c\u767a\u751f\u3057\u307e\u3059\u306e\u3067\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
String\u3068char\u306e\u5909\u63db<\/h2>\n
char\u304b\u3089String\u3078\u306e\u5909\u63db<\/h4>\n
char\u306e\u5024\u3092String\u3078\u5909\u63db\u3059\u308b\u5834\u5408\u306f\u3001valueOf\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n
valueOf\u30e1\u30bd\u30c3\u30c9\u306e\u5f15\u6570\u306b\u3001char\u306e\u5024\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n
public class Main {\r\n \r\n    public static void main(String[] args) {\r\n        char c = 'a';\r\n        String str = String.valueOf(c);\r\n        System.out.println(\"str : \" + str);\r\n    }\r\n\r\n}<\/pre>\n
\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n
str : a<\/pre>\n
String\u304b\u3089char\u3078\u306e\u5909\u63db<\/h4>\n
String\u304b\u3089char\u3078\u5909\u63db\u3059\u308b\u5834\u5408\u306f\u3001charAt\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066String\u306eindex\u756a\u53f7\u3092\u6307\u5b9a\u3057\u3066\u30011\u6587\u5b57\u3060\u3051\u53d6\u5f97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
public class Main {\r\n \r\n    public static void main(String[] args) {\r\n        String str = \"apple\";\r\n        char c = str.charAt(0);\r\n        System.out.println(\"c : \" + c);\r\n    }\r\n\r\n}<\/pre>\n
\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n
c : a<\/pre>\n
String\u306e\u5024\u3092\u5168\u3066\u53d6\u5f97\u3057\u305f\u3044\u5834\u5408\u306f\u3001toCharArray\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n
public class Main {\r\n \r\n    public static void main(String[] args) {\r\n        String str = \"apple\";\r\n        char[] c = str.toCharArray();\r\n        for(char c1 : c) {\r\n           System.out.println(c1);\r\n        }\r\n    }\r\n\r\n}<\/pre>\n
\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n
a\r\np\r\np\r\nl\r\ne<\/pre>\n
String\u3068byte\u306e\u5909\u63db<\/h2>\n
byte\u914d\u5217\u304b\u3089String\u3078\u306e\u5909\u63db<\/h4>\n
byte\u306e\u5024\u3092String\u3078\u5909\u63db\u3059\u308b\u5834\u5408\u306f\u3001String\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n
String\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u5f15\u6570\u306b\u3001byte\u306e\u5024\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n
public class Main {\r\n \r\n    public static void main(String[] args) {\r\n        byte[] sbyte = \"12345\".getBytes();\r\n        String str = new String(sbyte);\r\n        System.out.println(\"str : \" + str);\r\n    }\r\n\r\n}<\/pre>\n
\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n
str : 12345<\/pre>\n
String\u304b\u3089byte\u914d\u5217\u3078\u306e\u5909\u63db<\/h4>\n
String\u306e\u5024\u3092byte\u3078\u5909\u63db\u3059\u308b\u5834\u5408\u306f\u3001getBytes\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n
public class Main {\r\n \r\n    public static void main(String[] args) {\r\n        String str = \"apple\";\r\n        byte[] sbyte = str.getBytes();\r\n        for(int i=0; i<sbyte.length; i++) {\r\n            \/\/16\u9032\u6570\u3067\u51fa\u529b\r\n            System.out.println(Integer.toHexString(sbyte[i]));\r\n        }\r\n    }\r\n\r\n}<\/pre>\n
\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n
61\r\n70\r\n70\r\n6c\r\n65<\/pre>\n
\u307e\u3068\u3081<\/h2>\n
String\u304b\u3089\u3055\u307e\u3056\u307e\u306a\u578b\u3078\u5909\u63db\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3057\u305f\u3002<\/p>\n
String\u304b\u3089\u306e\u578b\u5909\u63db\u306f\u3001\u3042\u3089\u3086\u308b\u5834\u9762\u3067\u4f7f\u7528\u3059\u308b\u6a5f\u4f1a\u304c\u3042\u308b\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n
\u3082\u3057\u3001String\u304b\u3089\u306e\u578b\u5909\u63db\u306e\u65b9\u6cd5\u3092\u5fd8\u308c\u3066\u3057\u307e\u3063\u305f\u3089\u3001\u3053\u306e\u8a18\u4e8b\u3092\u601d\u3044\u51fa\u3057\u3066\u304f\u3060\u3055\u3044\u306d\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
Java\u3067String\u578b\u3068\u6574\u6570\u578b\uff08short,int,long\uff09\u306e\u5909\u63db\u65b9\u6cd5\u304c\u77e5\u308a\u305f\u3044 String\u578b\u3068\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\uff08float,double\uff09\u306e\u5909\u63db\u65b9\u6cd5\u304c\u77e5\u308a\u305f\u3044 String\u578b\u3068\u65e5\u4ed8\u578b\u306e\u5909\u63db\u65b9\u6cd5\u304c\u77e5\u308a\u305f\u3044 Java\u306eS […]<\/p>\n","protected":false},"author":16433,"featured_media":99849,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"swell_btn_cv_data":"","footnotes":""},"categories":[2344],"tags":[],"class_list":["post-19352","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-java-study"],"acf":[],"yoast_head":"\nJava\u3067String\uff08\u6587\u5b57\u5217\uff09\u3092\u5909\u63db\u3059\u308b\u65b9\u6cd5\u307e\u3068\u3081\uff08short,int,long\u7b49\u306b\u5909\u63db\uff09 | \u4f8d\u30a8\u30f3\u30b8\u30cb\u30a2\u30d6\u30ed\u30b0<\/title>\n<meta name=\"description\" content=\"\u3053\u306e\u8a18\u4e8b\u3067\u306f\u300c Java\u3067String\uff08\u6587\u5b57\u5217\uff09\u3092\u5909\u63db\u3059\u308b\u65b9\u6cd5\u307e\u3068\u3081\uff08short,int,long\u7b49\u306b\u5909\u63db\uff09 \u300d\u306b\u3064\u3044\u3066\u3001\u8ab0\u3067\u3082\u7406\u89e3\u3067\u304d\u308b\u3088\u3046\u306b\u89e3\u8aac\u3057\u307e\u3059\u3002\u3053\u306e\u8a18\u4e8b\u3092\u8aad\u3081\u3070\u3001\u3042\u306a\u305f\u306e\u60a9\u307f\u304c\u89e3\u6c7a\u3059\u308b\u3060\u3051\u3058\u3083\u306a\u304f\u3001\u65b0\u305f\u306a\u6c17\u4ed8\u304d\u3082\u767a\u898b\u3067\u304d\u308b\u3053\u3068\u3067\u3057\u3087\u3046\u3002\u304a\u60a9\u307f\u306e\u65b9\u306f\u305c\u3072\u3054\u4e00\u8aad\u304f\u3060\u3055\u3044\u3002\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.sejuku.net\/blog\/19352\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java\u3067String\uff08\u6587\u5b57\u5217\uff09\u3092\u5909\u63db\u3059\u308b\u65b9\u6cd5\u307e\u3068\u3081\uff08short,int,long\u7b49\u306b\u5909\u63db\uff09 | \u4f8d\u30a8\u30f3\u30b8\u30cb\u30a2\u30d6\u30ed\u30b0\" \/>\n<meta property=\"og:description\" content=\"\u3053\u306e\u8a18\u4e8b\u3067\u306f\u300c Java\u3067String\uff08\u6587\u5b57\u5217\uff09\u3092\u5909\u63db\u3059\u308b\u65b9\u6cd5\u307e\u3068\u3081\uff08short,int,long\u7b49\u306b\u5909\u63db\uff09 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