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René Knipschild
2022-06-02 16:16:04 +02:00
commit afacff8476
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23
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.idea/description.html generated Normal file
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<html>Simple <b>Java</b> application that includes a class with <code>main()</code> method</html>

6
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12
HowToJava.iml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
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src/Main2.java Normal file
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import com.rkcsd.apps.demo.gui.MainWindow;
public class Main2 {
public static void main(String[] args) {
MainWindow w = new MainWindow();
}
public static void main2(String[] args) {
MyApp abc = new MyApp("Hello World", 0);
abc.appVersion = 6;
abc.setAppName("Test");
System.out.println("MyStaticApp.getAppName()" + MyStaticApp.getAppName());
MyApp xyz = new MyApp("zweite App", 5);
xyz.setAppName("hkjhkjh");
System.out.println(abc.getAppName());
System.out.println(xyz.getAppName());
MyStaticApp.appVersion = 4;
//MyStaticApp.setAppName("static rulez!");
System.out.println("MyStaticApp.getAppName()" + MyStaticApp.getAppName());
}
}

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src/MyApp.java Normal file
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public class MyApp {
private String appName = "Test";
public int appVersion = 6;
public MyApp(String appName, int appVersion) {
}
public void setAppName(String appName) {
MyStaticApp.setAppName(appName);
this.appName = appName + "!";
}
public String getAppName() {
return appName;
}
}

12
src/MyStaticApp.java Normal file
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public class MyStaticApp {
private static String appName = "Test";
public static int appVersion = 6;
public static void setAppName(String appName) {
MyStaticApp.appName = appName + "!";
}
public static String getAppName() {
return appName;
}
}

94
src/com/rkcsd/apps/demo/gui/MainWindow.java Normal file
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package com.rkcsd.apps.demo.gui;
import com.rkcsd.apps.demo.main.Calculator;
import com.rkcsd.apps.demo.main.Main;
import com.rkcsd.apps.demo.main.StringToNumberConverter;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JTextField;
public class MainWindow extends JFrame {
private JTextField input1;
private JTextField input2;
private JLabel text;
private JButton btnPrinterList;
private JButton btnAdminPanel;
private JButton btnExit;
private JComboBox cbx;
public MainWindow() {
super("Meine Anwendung");
this.setSize(1000, 500);
this.setLayout(null);
btnPrinterList = new JButton("DL Anzeigen");
btnPrinterList.setBounds(10, 210, 500, 20);
btnPrinterList.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
PrinterListWindow secondWindow = new PrinterListWindow(MainWindow.this);
}
});
this.add(btnPrinterList);
btnAdminPanel = new JButton("Admin Panel öffnen");
btnAdminPanel.setBounds(10, 105, 500, 20);
btnAdminPanel.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
MainWindow second = new MainWindow();
}
});
this.add(btnAdminPanel);
btnExit = new JButton("Beenden");
btnExit.setBounds(500, 315, 500, 20);
btnExit.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
});
this.add(btnExit);
this.setVisible(true);
}
private void doAction() {
StringToNumberConverter stnc1 = new StringToNumberConverter(input1.getText());
StringToNumberConverter stnc2 = new StringToNumberConverter(input2.getText());
double d1 = stnc1.doConversion();
double d2 = stnc2.doConversion();
if (stnc1.hasError() || stnc2.hasError()) {
JOptionPane.showMessageDialog(MainWindow.this,
"Da ging wohl was schief");
} else {
Calculator calc = new Calculator(d1, d2);
if (cbx.getSelectedItem().equals("+")) {
calc.doAdd();
} else if (cbx.getSelectedItem().equals("-")) {
calc.doSubtract();
}
JOptionPane.showMessageDialog(MainWindow.this,
"Das Ergebnis lautet: " + calc.getResult());
}
}
}

87
src/com/rkcsd/apps/demo/gui/MainWindowOld.java Normal file
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package com.rkcsd.apps.demo.gui;
import com.rkcsd.apps.demo.main.Calculator;
import com.rkcsd.apps.demo.main.StringToNumberConverter;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JTextField;
public class MainWindowOld extends JFrame {
private JTextField input1;
private JTextField input2;
private JLabel text;
private JButton action;
private JComboBox cbx;
public MainWindowOld() {
super("Meine Anwendung");
this.setSize(1000, 500);
this.setLayout(null);
text = new JLabel("Bitte geben Sie etwas ein:");
text.setBounds(10, 10, 500, 20);
this.add(text);
input1 = new JTextField();
input1.setBounds(10, 60, 500, 20);
this.add(input1);
input2 = new JTextField();
input2.setBounds(10, 110, 500, 20);
this.add(input2);
cbx = new JComboBox();
cbx.setBounds(10, 160, 500, 20);
cbx.addItem("+");
cbx.addItem("-");
this.add(cbx);
action = new JButton("Beschriftung");
action.setBounds(10, 210, 500, 20);
action.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
MainWindowOld.this.doAction();
}
});
this.add(action);
this.setVisible(true);
}
private void doAction() {
StringToNumberConverter stnc1 = new StringToNumberConverter(input1.getText());
StringToNumberConverter stnc2 = new StringToNumberConverter(input2.getText());
double d1 = stnc1.doConversion();
double d2 = stnc2.doConversion();
if (stnc1.hasError() || stnc2.hasError()) {
JOptionPane.showMessageDialog(MainWindowOld.this,
"Da ging wohl was schief");
} else {
Calculator calc = new Calculator(d1, d2);
if (cbx.getSelectedItem().equals("+")) {
calc.doAdd();
} else if (cbx.getSelectedItem().equals("-")) {
calc.doSubtract();
}
JOptionPane.showMessageDialog(MainWindowOld.this,
"Das Ergebnis lautet: " + calc.getResult());
}
}
}

19
src/com/rkcsd/apps/demo/gui/PrinterListWindow.java Normal file
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package com.rkcsd.apps.demo.gui;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JTable;
public class PrinterListWindow extends JDialog {
public PrinterListWindow(JFrame mainWindow) {
super(mainWindow);
setLayout(null);
setSize(800, 600);
JTable t = new JTable();
t.setBounds(10, 10, 700, 500);
this.add(t);
setVisible(true);
}
}

32
src/com/rkcsd/apps/demo/main/Calculator.java Normal file
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package com.rkcsd.apps.demo.main;
public class Calculator {
private double value1;
private double value2;
private double result;
public Calculator(double value1, double value2) {
setValue1(value1);
setValue2(value2);
}
public void setValue1(double value1) {
this.value1 = value1;
}
public void setValue2(double value2) {
this.value2 = value2;
}
public void doAdd() {
result = value1 + value2;
}
public void doSubtract(){
result = value1 - value2;
}
public double getResult() {
return result;
}
}

14
src/com/rkcsd/apps/demo/main/Main.java Normal file
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package com.rkcsd.apps.demo.main;
import com.rkcsd.apps.demo.gui.MainWindow;
public class Main {
public static void main(String[] args) {
MainWindow w = new MainWindow();
}
}

22
src/com/rkcsd/apps/demo/main/StringToNumberConverter.java Normal file
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package com.rkcsd.apps.demo.main;
public class StringToNumberConverter {
private String s;
private double n;
private boolean error;
public StringToNumberConverter(String s) {
this.s = s;
}
public double doConversion() {
this.error = false;
try {
n = Double.parseDouble(s);
} catch (NumberFormatException e) {
this.error = true;
}
return n;
}
public boolean hasError() {
return error;
}
}