 |
| Display smiley face character in Java |
package javaex_smileyface;
/**
* @web http://java-buddy.blogspot.com/
*/
public class JavaEx_SmileyFace {
public static void main(String[] args) {
System.out.println('\u263A');
System.out.println('☺');
}
}
 |
| "package gnu.io does not exist" thrown without Build Path set |
 |
| Setup project properties |
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| Add JAR/Folder |
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| Add RXTXcomm.jar |
 |
| UnsatisfiedLinkError |
package javalibpath;
public class JavaLibPath {
public static void main(String[] args) {
String libPathProperty = System.getProperty("java.library.path");
System.out.println(libPathProperty);
}
}
 |
| Check the Output window |
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| Install RxTx on Ubuntu with Synaptic Package Manager |
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| JDeveloper Tutorial: Building Mobile Applications with Oracle ADF Mobile |
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| Auto adjust width of Rectangle when parent resized |
package javafxrect;
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;
import javafx.scene.shape.RectangleBuilder;
import javafx.stage.Stage;
/**
* @web http://java-buddy.blogspot.com/
*/
public class JavaFXRect extends Application {
@Override
public void start(Stage primaryStage) {
//Group root = new Group();
VBox root = new VBox(5); // spacing = 5
root.setPadding(new Insets(10, 10, 10, 10));
Scene scene = new Scene(root, 300, 250);
Button btn = new Button();
btn.setText("java-buddy.blogspot.com");
btn.setOnAction(new EventHandler<ActionEvent>() {
@Override
public void handle(ActionEvent event) {
System.out.println("Hello World!");
}
});
//Create Rectangle with RectangleBuilder
Rectangle rect = RectangleBuilder
.create()
.width(scene.getWidth() - 20)
.height(50)
.fill(Color.AZURE)
.stroke(Color.rgb(150, 150, 150))
.strokeWidth(3)
.build();
//adjust rect width follow scene resizing
rect.widthProperty().bind(scene.widthProperty().subtract(20));
root.getChildren().addAll(rect, btn);
primaryStage.setTitle("Hello World!");
primaryStage.setScene(scene);
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}
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| Create Rectangle with RectangleBuilder, set width according to parent. |
package javafxrect;
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;
import javafx.scene.shape.RectangleBuilder;
import javafx.stage.Stage;
/**
* @web http://java-buddy.blogspot.com/
*/
public class JavaFXRect extends Application {
@Override
public void start(Stage primaryStage) {
//Group root = new Group();
VBox root = new VBox(5); // spacing = 5
root.setPadding(new Insets(10, 10, 10, 10));
Scene scene = new Scene(root, 300, 250);
Button btn = new Button();
btn.setText("java-buddy.blogspot.com");
btn.setOnAction(new EventHandler<ActionEvent>() {
@Override
public void handle(ActionEvent event) {
System.out.println("Hello World!");
}
});
//Create Rectangle with RectangleBuilder
Rectangle rect = RectangleBuilder
.create()
.width(scene.getWidth() - 20)
.height(50)
.fill(Color.AZURE)
.stroke(Color.rgb(150, 150, 150))
.strokeWidth(3)
.build();
root.getChildren().addAll(rect, btn);
primaryStage.setTitle("Hello World!");
primaryStage.setScene(scene);
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}
 |
| Print all digit in Unicode |
package java_unicodecodepoint;
/**
* @web http://java-buddy.blogspot.com/
*/
public class Java_UnicodeCodePoint {
public static void main(String[] args) {
System.out.println("http://java-buddy.blogspot.com/");
int maxCodePoint = Character.MAX_CODE_POINT;
System.out.printf("MAX_CODE_POINT = %x\n", maxCodePoint);
//print all digital Unicode
for(int i=0; i<=maxCodePoint; i++){
if(Character.isDigit(i)){
System.out.printf("Unicode: %x\t%c\tName:%s\n",
i, i, Character.getName(i));
}
}
}
}
 |
| JavaFX ComboBox for custom object |
package javafxcombobox;
import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.ComboBox;
import javafx.scene.control.Label;
import javafx.scene.control.ListCell;
import javafx.scene.control.ListView;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
import javafx.util.Callback;
/**
* @web http://java-buddy.blogspot.com/
*/
public class JavaFXComboBox extends Application {
class Site{
String name;
String webaddr;
Site(String n, String a){
name = n;
webaddr = a;
}
@Override
public String toString() {
return name;
}
}
ObservableList<Site> siteList =
FXCollections.observableArrayList(
new Site("Google", "http://www.google.com"),
new Site("MicroSoft", "http://www.microsoft.com"),
new Site("Apple", "http://www.apple.com"),
new Site("Java-Buddy", "http://java-buddy.blogspot.com/")
);
@Override
public void start(Stage primaryStage) {
final ComboBox comboBox = new ComboBox(siteList);
comboBox.getSelectionModel().selectFirst(); //select the first element
comboBox.setCellFactory(new Callback<ListView<Site>,ListCell<Site>>(){
@Override
public ListCell<Site> call(ListView<Site> p) {
final ListCell<Site> cell = new ListCell<Site>(){
@Override
protected void updateItem(Site t, boolean bln) {
super.updateItem(t, bln);
if(t != null){
setText(t.name + ":" + t.webaddr);
}else{
setText(null);
}
}
};
return cell;
}
});
final Label label = new Label();
Button btn = new Button();
btn.setText("Read comboBox");
btn.setOnAction(new EventHandler<ActionEvent>() {
@Override
public void handle(ActionEvent event) {
label.setText("selected: " + comboBox.getValue());
}
});
VBox vBox = new VBox();
vBox.setPadding(new Insets(5, 5, 5, 5));
vBox.setSpacing(5);
vBox.getChildren().addAll(label, comboBox, btn);
StackPane root = new StackPane();
root.getChildren().add(vBox);
Scene scene = new Scene(root, 300, 250);
primaryStage.setTitle("Hello World!");
primaryStage.setScene(scene);
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}