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Work with two-way schedule in java

briley last edited by

In an attempt to use Graphics2D, NetBeans suggests that abstract methods be implemented from this class, how do methods not be implemented, but be able to rent objects?
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inna last edited by
Start JPanel, close the paint method (Graphics g) and change the type g:
```
public void paint (Graphics g) {
    Graphics2D g2 = (Graphics2D) g;
    ...
}
```
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how to change the size of the body dynamically
Software Programming • java liabilities • • Kadyn

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Massives are intact. If you need to install or dispose of objects of something, use the interface assembly and its heirs. We can start with class ArrayList. http://www.tutorialspoint.com/java/java_arraylist_class.htm
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Java String.replaceAll() regular expression, replace all special features
Software Programming • java regular expression • • obi

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We use regular. &.+?; for disposal:String text = " CRI>80\n<div class=\"properties__value\">\n CRI>80\n </div> \n </div> "; text = text.replaceAll("&.+?;", ""); System.out.println(text); Result: CRI80 <div class="properties__value"> CRI80 </div> </div>
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Work for java
Software Programming • java sql • • obi

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Add table InvertoryCost (id, inventoryId, cost, date, ...) join this table andSELECT "Все поля", MAX(Date) AS LatestDate FROM ... LEFT JOIN InventoryCost ON InventoryCost.inventoryId = ...Id GROUP BY "Все поля"
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Work with Java abstract Class
Software Programming • java op spring boot • • Amritpal

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We can do this:public interface Storage { void save(); } @Component public class StorageOne implements Storage { public void save() { ...... } } @Component public class StorageTwo implements Storage { public void save() { ...... } } @Service public class Manager { @Autowired private List<Storage> storages; public void save() { for (Storage storage : storages) { storage.save(); } } }
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Search user-login with MySql and Java
Software Programming • java mysql • • emran

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The code you pose has some errors that can be billed as your data model grows.The largest is to consult the entire table to obtain the user list. The first would be that the SQL only gave with the user result by username or none. To do this, a filter must be added. If this filter you would be traveling the entire table if the user is not valid what is a waste of time and memory. Besides being able to cause OutOfMemoryException errors if we don't have enough memory to get the entire table in memory.The second problem is to put the "user" and "contraseña" variables as class variables. If this class is a "singleton" you may have problems of concurrence and a user accesses as another (among other things). Or use the name saved above when you login again.Example using the filter select:String usuario = txt_usuario.getText(); String password = txt_pass.getText(); Connection cn; PreparedStatement pst; ResultSet rs; try { // Se inicializa a null String usuarioCorrecto = null; String passwordCorrecta = null; String tipo_nivel = null; String nombre = null; // Realizar la conexion SQL cn = DriverManager.getConnection("jdbc:mysql://localhost/servicio_tecnico", "root", ""); // Ejecutar la consulta pst = cn.prepareStatement("SELECT username,password,tipo_nivel,nombre_usuario FROM usuarios WHERE username = ?"); pst.setString(1, usuario ) rs = pst.executeQuery(); // Solo se obtiene el primer registro (Si existe) if (rs.next()) { usuarioCorrecto = rs.getString(1); passwordCorrecta = rs.getString(2); tipo_nivel = rs.getString(3); nombre = rs.getString(4); } // Si se ha obtenido un usuario y password y ademas esta es coincidente if (usuarioCorrecto !=null && password!=null && password.equals(passwordCorrecta)) { if(tipo_nivel!=null){ if (tipo_nivel.equals("Administrador")) { ventanaMenu vm = new ventanaMenu(); this.setVisible(false); vm.setVisible(true); } else if (tipo_nivel.equals("Capturista")) { } else if (tipo_nivel.equals("Tecnico")) { } } } else { JOptionPane.showMessageDialog(null, "Usuario o contraseña incorrectos"); } } catch (Exception e) { JOptionPane.showMessageDialog(null, "Error " + e); } finally { // Cierre de recursos (si se usa java7 se puede usar un try-with-resources if(rs!=null){ rs.close(); } if(pst!=null){ pst.close(); } if(cn!=null){ cn.close(); } } It would also be advisable not to use the key in the database as anyone who can access it can see the user's key. It would be advisable to encrypt the key with some Mysql encryption (we could solve it with a more complete SQL) or some other method like using a function https://www.baeldung.com/sha-256-hashing-java or https://www.baeldung.com/java-md5 in JavaFinally, a management of the connection and access to data through a specialized class can further improve future operation and maintenance. Programming the whole log on a button, including opening data access is a bad software design that can cause problems in the future.In your example you have the Logic in the Method:button_okActionPerformed(java.awt.event.ActionEvent evt)which is a method of a button action where the whole process is done.The ideal thing is that this process only made a call to a class login method and that it contains all the logic.Example:private void button_okActionPerformed(java.awt.event.ActionEvent evt) { String usuario = txt_usuario.getText(); String clave = txt_pass.getText(); Usuario usuario = controlador.login(usuario,clave); if(usuario == null){ JOptionPane.showMessageDialog(null, "Usuario o contraseña incorrectos") } } Where "Usario" would be a java object (a POJO) with user information and "controller" would be an object with the code of access to data and methods like "login" to make accessNote: The code is made without knowing the Java version so according to the version some things could be better implemented
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Add two hours in Java
Software Programming • java time • • gionna

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The truth is class Time It's not convenient for the use you're giving him. While time means time, the correct translation for use would be time.For example a class Time cannot reflect a duration exceeding 24 hours.To save the duration of the chapters of a series a convenient measure can be the minutes that last, and that can be accumulated quietly in a int. For example 80hs would be 80*60 = 4800 minutos.Then you can use a function that returns time as String making the reverse step. For example 4826 minutos are: int hh = (int)(4826 / 60); // 80 int mm = 4826 % 60; // los 26 minuto adicionales de la fracción And you can show it like: String.format("%02d:%02d", hh, mm);
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Java sample of two-size
Software Programming • java • • Jolied

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for (int n = 0; n == columns; n++) { ^^ for (int c = 0; c == coorect; c++) { ^^ It's called "condition." continued the cycle."contractor[c][n] = c[j][n]; ^ ^ Is there enough letters?
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How to pass data from one Jtable to another Jtable
Software Programming • java • • Trenton

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Get it fixed, in case someone becomes useful.if (evt.getClickCount() == 2) { int idGobernanta = Integer.parseInt(Tbl_Datos.getValueAt(Tbl_Datos.getSelectedRow(), 1).toString()); int idPiso = Integer.parseInt(Tbl_Datos.getValueAt(Tbl_Datos.getSelectedRow(), 2).toString()); Cbx_Gobernanta.setSelectedItem(idGobernanta); Cbx_Piso.setSelectedItem(idPiso); int filaSeleccionada = Tbl_Datos.getSelectedRow(); if (1 == 1) { if (filaSeleccionada >= 0) { String Vector[] = new String[2]; Vector[0] = Tbl_Datos.getValueAt(filaSeleccionada, 3).toString(); Vector[1] = Tbl_Datos.getValueAt(filaSeleccionada, 4).toString(); modelo2.addRow(Vector); } } if (Tbl_Datos.getValueAt(Tbl_Datos.getSelectedRow(), 5).toString().equals("Activo")) { Rdb_Activo.setSelected(true); } else { Rdb_Inactivo.setSelected(true); } }
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Why would a java programmer know how a garbage collector works and how the white code works?
Software Programming • java jvm garbage collector bytecod • • yajahira

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The garbage collector has different strategies and implementation:Serial GC,Parallel GC,CMS GC,G1.Each of them has a set of parameters that can be managed by the subtle design of JVM under a specific annex (depending on objectives, reducing STW-delays, reducing consumable resources, literate memory levels for young/old generation, etc.). Naturally, you don't need to know these nuances and you can just use JVM standard designs... As long as your app does not start eating all available operational memory or delaying its work. That's when that knowledge comes to use. In my view, a good programmer is different that he has a wide range and knows how the tool he uses.
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Fullscreen Video on Android Webview
Software Programming • java html android android webview • • chanisef

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Well, follow an example of functional deeplink. I created an HTML page to be uploaded to the app with the link (), calling the app. The video of the example took http://clips.vorwaerts-gmbh.de/VfE_html5.mp4 .AndroidManifest. xmlIt is in the manifest that I will make the configuration of the deep link. The deep link is nothing more than a path into the app, where I will open an activity and process the value of what came from the deep link. VideoActivity in the manifest was configured to accept a link with the deeplinkvideo format://video<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.grupoestudos.deeplinkwebview"> <uses-permission android:name="android.permission.INTERNET" /> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme"> <activity android:name=".MainActivity" android:screenOrientation="portrait"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <activity android:name=".VideoActivity" android:theme="@style/AppTheme.FullScreen" android:screenOrientation="landscape"> <intent-filter android:label="VideoDeepLink"> <action android:name="android.intent.action.VIEW" /> <category android:name="android.intent.category.DEFAULT" /> <category android:name="android.intent.category.BROWSABLE" /> <data android:scheme="deeplinkvideo" android:host="video" /> </intent-filter> </activity> </application> </manifest> styles. xml <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">  <item name="colorPrimary">@color/colorPrimary</item> <item name="colorPrimaryDark">@color/colorPrimaryDark</item> <item name="colorAccent">@color/colorAccent</item> </style> <style name="AppTheme.FullScreen" parent="AppTheme"> <item name="windowNoTitle">true</item> <item name="windowActionBar">false</item> <item name="android:windowFullscreen">true</item> <item name="android:windowContentOverlay">@null</item> </style> index. htmlThis file was created to simulate, it has only one link, calling the format that was created in the app. Note that I pass the name of the video file as querystring, and I will read that value later.<html> <body> <a href="deeplinkvideo://video?video=VfE_html5.mp4">Link para o video</a> </body> </html> MainActivity. ♪Here I will only load the webview reading the assetspackage com.grupoestudos.deeplinkwebview; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.webkit.WebView; public class MainActivity extends AppCompatActivity { private WebView mWebView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mWebView = (WebView)findViewById(R.id.webView); mWebView.loadUrl("file:///android_asset/index.html"); } } activity_main. xml<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent"> <WebView android:id="@+id/webView" android:layout_width="match_parent" android:layout_height="match_parent" /> </LinearLayout> Now in this activity that's the cat's neck. In it I will get the querystring passed through the deeplink, and upload the file in Android VideoView.VideoActivity. ♪package com.grupoestudos.deeplinkwebview; import android.content.Intent; import android.net.Uri; import android.os.Bundle; import android.support.annotation.Nullable; import android.support.v7.app.AppCompatActivity; import android.widget.VideoView; public class VideoActivity extends AppCompatActivity { @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_video); //Este parametro vai ser importante, pois ele vai ter o id do video para carregarmos Uri data = getIntent().getData(); String uri = "http://clips.vorwaerts-gmbh.de/" + data.getQueryParameter("video"); VideoView mVideoView = (VideoView)findViewById(R.id.videoView); if (mVideoView != null) { mVideoView.setVideoURI(Uri.parse(uri)); mVideoView.requestFocus(); mVideoView.start(); } } } activity_video. xml<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> <VideoView android:id="@+id/videoView" android:layout_width="match_parent" android:layout_height="wrap_content" /> </LinearLayout> Only with regard to videoview controls that I do not know right how to stir well beauty? I hope I helped.
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Working with Hexadecimal in Java
Software Programming • java character operators int hexadec languageimal • • meriah

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First: hexadecimal is only a numerical representation, so it doesn't matter how it was described in the code, what matters is the number itself.Second: has no secret if it is known what the operator & Do it. It analyzes bit by bit of the numbers and each of them results in 1 if both matching bits are worth 1. And they result in 0 in any other situation.Then the analysis is best done in binary representation and not hexadecimal, decimal or other representation. After all the computer only understands the binary even. The other representations serve to facilitate humans.Then0010 0010 0010 0010‬ & 0000 0000 0000 1111 0000 0000 0000 0010 ^ Só aqui coincidiu de ambos serem 1. Related: https://pt.stackoverflow.com/q/190579/101 https://pt.stackoverflow.com/q/34292/101 https://pt.stackoverflow.com/q/52949/101 https://pt.stackoverflow.com/q/175345/101
Explain why the code works that way?
Software Programming • python python 3.x • • jeanid

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Pitthon's a very handsome language, Guido van Rossum's trying, so it makes it easier to do a lot of things, on the other hand, almost every language can be made easier, so you don't have to put yourself in in a code line.s = str(input()) result = s.find('f'); print (result if result != -1 else '') There's a smaller line here, and task one time, and work as a watch.
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Use of "Instance of"
Software Programming • java classes insta • • baileigh

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The result is correct since you added a1 that is only a student, not al1 who's a high school student.I do not know if this is a typing error (facilitated by bad names of variables) or it was thought that the fact that an object receives another object, that other goes on to be something else, which would make no sense.In fact I find this inheritance wrong, which becomes clearer by the fact that it has to create a parent object to then create another that is child. O https://pt.stackoverflow.com/q/73530/101 .
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Transfer of event to activate B in A
Software Programming • java android button events activity • • kalyn

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At each point of time, there's only one activism that's visible on the screen. All others in the background (or at all destroyed) and the code in any case is not met (Android 7 introduced a multi-consistency regime, but it also carries a code only of visible activities on the screen).You can write your own class-- click-teacher. https://ru.stackoverflow.com/a/259662/177345 OnClickListener(d) and include it in different activities, but in practice such an approach is usually difficult to implement and carries more crutches than profiling.Two-seat buttons (interface and separate panels) use fragments - it is possible to use a separate class-teacher for a realistic interface. OnClickListener and managing the knobs.In fact, the player is about to be realized: music is losing. Service♪ There is also a fragment with the loser management interface that interacts with the service and manages reproduction. This fragment is now being removed wherever the control panel is required. If necessary, the data exchange with the outside world is created by the collars.If you need a reaction to the user's actions in another activist, you create your own interface there and you take your own listeners. If necessary, transmit the parameters (e.g., lost track number), flight https://ru.stackoverflow.com/a/556943/177345 Through https://ru.stackoverflow.com/a/293280/177345 or library, https://ru.stackoverflow.com/a/470923/177345 ♪ For feedback https://ru.stackoverflow.com/a/136267/177345 If you thought about the need for action on your question, you first built the incorrect architecture of your application and secondly, lacked knowledge to develop under this platform. I'm recommending the books, Brian Hardy, Reto Meyer and Paul Datell, then write an app.PS: Transfer copies of whatever might be the worst, I recommend not even think about it.
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How does Java sync work?
Software Programming • java thread loc languagek • • Kadyn

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In fact, if this happens, you shouldn't use it this way.People have the belief that putting new threads everything gets fast, but it often gets slower. See https://pt.stackoverflow.com/q/1946/101 .If thread Stay locked waiting for another in most of the time then there will only be time loss, never won. If this waiting is possible you can still have some gain, even if it is not so big, so you have to think well if it is worth the complexity of doing this, even because environment multi-thread It's harder to program and a lot can go wrong.There is only this problem if at least two threads compete for the same resource during processing. No threads in this scenario the competition will not exist but the speed would be limited. When you put another thread may well decrease the time to finalize while they are not competing for the feature and the wait only happens at a few moments if it happens in fact. In many cases the locking of a thread is very short so the wait is not long. It does not mean that this is good, but if it is possible it is not a big problem.Where real competition is expected in many cases it is not worth using this kind of strategy. There are data structures that do not need synchronization and allow better competition. Of course they have other disadvantages, so it cannot be used in any case. And most situations the solution is to have serialized processing even.Think of a database. Many work this way, it locks the record that is working because it is unlikely that another operation is accessing the same data, but if this happens then there will be a wait and this is not good, but it is better that this operation access the data that is already being accessed. Some databases use a system called MVCC in which all that is changed is copied then access does not create problems.If the accesses will be read-only synchronization is not required.

Work with two-way schedule in java

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