サンプルコード
|
1 2 3 4 5 6 7 8 9 10 11 12 |
public static Method getMethod(Class _class, Field field, String prefix) { Method[] methods = _class.getDeclaredMethods(); for (Method method : methods) { String methodName = method.getName(); String fieldName = field.getName(); String _fieldName = prefix + fieldName; if (methodName.toUpperCase().equals(_fieldName.toUpperCase())) { return method; } } return null; } |
サンプルコード
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 |
package procft; public class ChangFaEmployee { public static void main(String[] args) { System.out.println(" Name : " + ChangFaEmployee.class.getName()); System.out.println(" SimpleName : " + ChangFaEmployee.class.getSimpleName()); System.out.println(" Canonical Name: " + ChangFaEmployee.class.getCanonicalName()); System.out.println("Outer Anonymous Class"); new Object() { public void className() { System.out.println(" Name : " + getClass().getName()); System.out.println(" SimpleName : " + getClass().getSimpleName()); System.out.println(" CanonicalName : " + getClass().getCanonicalName()); } }.className(); } } 実行結果 Name : procft.ChangFaEmployee SimpleName : ChangFaEmployee Canonical Name: procft.ChangFaEmployee Outer Anonymous Class Name : procft.ChangFaEmployee$1 SimpleName : CanonicalName : null |
サンプルコード下記
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 |
package com.arkgame.study; import java.util.StringTokenizer; public class StringTokenizerDemo { public static void main(String[] args) { String cft = "456,010,119"; StringTokenizer bb = new StringTokenizer(cft, ","); int length = bb.countTokens(); String[] kdf = new String[length]; for (int i = 0; i < length; i++) { kdf[i] = bb.nextToken(); System.out.println(kdf[i]); } } } 結果 456 010 119 |
操作コマンド下記
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 |
1.jdk9のダウンロード ファイル名:jdk-9.0.4_linux-x64_bin.tar.gz 2.ファイルの展開 #tar -zxvf jdk-9.0.4_linux-x64_bin.tar.gz -C /usr/local/jdk9/ 3.環境設定 vim /etc/profile 追記 #set java environment JAVA_HOME=/usr/local/jdk9/jdk-9.0.4 CLASSPATH=$JAVA_HOME/lib/ PATH=$PATH:$JAVA_HOME/bin export PATH JAVA_HOME CLASSPATH 4.環境反映 source /etc/profile またはsudo shutdown -r now 5.バージョンの確認 java -version java version "9.0.4" Java(TM) SE Runtime Environment (build 9.0.4+11) Java HotSpot(TM) 64-Bit Server VM (build 9.0.4+11, mixed mode) |
サンプルコード
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 |
package com.arkgame.study; import java.security.SecureRandom; public class SecureRandDemo { public static void main(String[] args) { SecureRandom rand = new SecureRandom(); String cftLst = "abcdefghijklmnopqrstuvwxyz0123456789"; String target = ""; for (int i = 0; i < 8; i++) { int cft = rand.nextInt(cftLst.length()); target += cftLst.charAt(cft); } System.out.println("結果:" + target); } } 結果:8gbq8noa |
サンプルコード
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 |
/**データ追加 */ @POST @Produces(MediaType.APPLICATION_JSON) @Consumes(MediaType.APPLICATION_JSON) public BookBean postData(BookBean bean) throws SQLException { String strSql ="insert into tablename(xxxx"; //some code } /**データ更新 */ @PUT @Path("user") @Produces(MediaType.APPLICATION_JSON) @Consumes(MediaType.APPLICATION_JSON) public BookBean updateData(BookBean bean) throws SQLException { String strSql ="update tablename set xxxxx"; //some code } /**データ検索 */ @GET @Path("{bookId}") @Produces(MediaType.APPLICATION_JSON) public List<BookBean>selectByBookId(@PathParam("bookId") int bookId) throws SQLException { String strSql =" select * from tablename where xxx"; //some code } |
Javaコード:
package com.arkgame.study;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
public class StaticCondDemo {
public static final class ChangfaTu {
public static void funcA() {
System.out.println(“this is public static method “);
};
@SuppressWarnings(“unused”)
private static void funcB() {
System.out.println(“this is static static method “);
};
public void funcC() {
System.out.println(“this is public Common method “);
};
@SuppressWarnings(“unused”)
private void funcD() {
System.out.println(“this is private Common method “);
}
}
public static void main(String[] args) {
Method[] cftmd = ChangfaTu.class.getDeclaredMethods();
for (Method md : cftmd) {
if (Modifier.isStatic(md.getModifiers())) {
System.out.println(“staticメソッド：” + md.getName());
}
}
}
}
結果
staticメソッド：funcA
staticメソッド：funcB