Windows에서 작동하지만 Linux에서는 작동하지 않습니다.

Question

저는 Java 초보자이며 제 1 차 프로젝트 Quadratic Equations 솔버를 만들었습니다. Windows에서 잘 작동하지만 (다른 플랫폼에서도 작동하기로되어 있습니다.) 글쎄,이 하나의 리눅스 (BackBox, PuppyLinux)에서 작동하지 않습니다,하지만 그 시도가 실행되지 않습니다. 이 실패의 가능한 원인은 무엇입니까?

P.S 저는 "크로스 플랫폼"특히 Java의 초보자입니다.

여기에 코드입니다 : 내 JVM 설치 한

 /* 
* QuadraticEquations.java 
* 
* Created on Mar 17, 2012, 8:37:16 PM 
*/ 
/** 
* 
* @author Afaan 
*/ 
public class QuadraticEquations extends javax.swing.JFrame { 

    /** Creates new form QuadraticEquations */ 
    public QuadraticEquations() { 
     initComponents(); 
    } 

    /** This method is called from within the constructor to 
    * initialize the form. 
    * WARNING: Do NOT modify this code. The content of this method is 
    * always regenerated by the Form Editor. 
    */ 
    @SuppressWarnings("unchecked") 
    // <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents 
    private void initComponents() { 

     MainPanel = new javax.swing.JPanel(); 
     HeaderLabel = new javax.swing.JLabel(); 
     AuthorLabel = new javax.swing.JLabel(); 
     SubHeaderLabel = new javax.swing.JLabel(); 
     a_Label = new javax.swing.JLabel(); 
     b_Label = new javax.swing.JLabel(); 
     c_Label = new javax.swing.JLabel(); 
     a_Value = new javax.swing.JTextField(); 
     b_Value = new javax.swing.JTextField(); 
     c_Value = new javax.swing.JTextField(); 
     calc_Button = new javax.swing.JButton(); 
     ResultLabel = new javax.swing.JLabel(); 
     Root1_Label = new javax.swing.JLabel(); 
     Root2_Label = new javax.swing.JLabel(); 

     setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); 
     setTitle("Quadratic Equations Roots Calculator"); 

     HeaderLabel.setFont(new java.awt.Font("Lucida Fax", 1, 18)); // NOI18N 
     HeaderLabel.setForeground(new java.awt.Color(0, 0, 255)); 
     HeaderLabel.setHorizontalAlignment(javax.swing.SwingConstants.CENTER); 
     HeaderLabel.setText("Quadratic Equations - Roots Calculator"); 

     AuthorLabel.setFont(new java.awt.Font("Lucida Fax", 1, 14)); // NOI18N 
     AuthorLabel.setForeground(new java.awt.Color(0, 165, 0)); 
     AuthorLabel.setHorizontalAlignment(javax.swing.SwingConstants.CENTER); 
     AuthorLabel.setText("Afaan Bilal"); 

     SubHeaderLabel.setFont(new java.awt.Font("Lucida Fax", 1, 12)); // NOI18N 
     SubHeaderLabel.setText("Enter the values of 'a', 'b', 'c' : "); 

     a_Label.setFont(new java.awt.Font("Lucida Fax", 1, 12)); // NOI18N 
     a_Label.setForeground(new java.awt.Color(25, 22, 200)); 
     a_Label.setText("\" a \" :"); 

     b_Label.setFont(new java.awt.Font("Lucida Fax", 1, 12)); // NOI18N 
     b_Label.setForeground(new java.awt.Color(25, 22, 200)); 
     b_Label.setText("\" b \" :"); 

     c_Label.setFont(new java.awt.Font("Lucida Fax", 1, 12)); // NOI18N 
     c_Label.setForeground(new java.awt.Color(25, 22, 200)); 
     c_Label.setText("\" c \" :"); 

     a_Value.setText("1"); 

     b_Value.setText("2"); 

     c_Value.setText("1"); 

     calc_Button.setText("Calculate Roots!"); 
     calc_Button.addActionListener(new java.awt.event.ActionListener() { 
      public void actionPerformed(java.awt.event.ActionEvent evt) { 
       CalculateRoots(evt); 
      } 
     }); 

     ResultLabel.setFont(new java.awt.Font("Lucida Fax", 1, 14)); // NOI18N 
     ResultLabel.setHorizontalAlignment(javax.swing.SwingConstants.CENTER); 

     Root1_Label.setFont(new java.awt.Font("Lucida Fax", 1, 12)); // NOI18N 
     Root1_Label.setHorizontalAlignment(javax.swing.SwingConstants.CENTER); 

     Root2_Label.setFont(new java.awt.Font("Lucida Fax", 1, 12)); // NOI18N 
     Root2_Label.setHorizontalAlignment(javax.swing.SwingConstants.CENTER); 

     javax.swing.GroupLayout MainPanelLayout = new javax.swing.GroupLayout(MainPanel); 
     MainPanel.setLayout(MainPanelLayout); 
     MainPanelLayout.setHorizontalGroup(
      MainPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
      .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, MainPanelLayout.createSequentialGroup() 
       .addGroup(MainPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING) 
        .addGroup(javax.swing.GroupLayout.Alignment.LEADING, MainPanelLayout.createSequentialGroup() 
         .addGap(149, 149, 149) 
         .addGroup(MainPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
          .addComponent(b_Label) 
          .addComponent(a_Label, javax.swing.GroupLayout.PREFERRED_SIZE, 60, javax.swing.GroupLayout.PREFERRED_SIZE) 
          .addComponent(c_Label)) 
         .addGap(18, 18, 18) 
         .addGroup(MainPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false) 
          .addComponent(c_Value) 
          .addComponent(b_Value) 
          .addComponent(a_Value, javax.swing.GroupLayout.DEFAULT_SIZE, 135, Short.MAX_VALUE)) 
         .addGap(69, 69, 69)) 
        .addGroup(javax.swing.GroupLayout.Alignment.LEADING, MainPanelLayout.createSequentialGroup() 
         .addGap(41, 41, 41) 
         .addGroup(MainPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
          .addComponent(ResultLabel, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, 412, Short.MAX_VALUE) 
          .addComponent(SubHeaderLabel, javax.swing.GroupLayout.PREFERRED_SIZE, 222, javax.swing.GroupLayout.PREFERRED_SIZE) 
          .addComponent(Root2_Label, javax.swing.GroupLayout.DEFAULT_SIZE, 412, Short.MAX_VALUE) 
          .addComponent(Root1_Label, javax.swing.GroupLayout.DEFAULT_SIZE, 412, Short.MAX_VALUE)))) 
       .addContainerGap()) 
      .addGroup(MainPanelLayout.createSequentialGroup() 
       .addContainerGap() 
       .addComponent(HeaderLabel, javax.swing.GroupLayout.DEFAULT_SIZE, 412, Short.MAX_VALUE) 
       .addGap(41, 41, 41)) 
      .addGroup(MainPanelLayout.createSequentialGroup() 
       .addGap(167, 167, 167) 
       .addComponent(AuthorLabel, javax.swing.GroupLayout.PREFERRED_SIZE, 112, javax.swing.GroupLayout.PREFERRED_SIZE) 
       .addContainerGap(184, Short.MAX_VALUE)) 
      .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, MainPanelLayout.createSequentialGroup() 
       .addContainerGap(176, Short.MAX_VALUE) 
       .addComponent(calc_Button, javax.swing.GroupLayout.PREFERRED_SIZE, 139, javax.swing.GroupLayout.PREFERRED_SIZE) 
       .addGap(148, 148, 148)) 
     ); 
     MainPanelLayout.setVerticalGroup(
      MainPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
      .addGroup(MainPanelLayout.createSequentialGroup() 
       .addContainerGap() 
       .addComponent(HeaderLabel, javax.swing.GroupLayout.PREFERRED_SIZE, 42, javax.swing.GroupLayout.PREFERRED_SIZE) 
       .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) 
       .addComponent(AuthorLabel, javax.swing.GroupLayout.PREFERRED_SIZE, 27, javax.swing.GroupLayout.PREFERRED_SIZE) 
       .addGap(18, 18, 18) 
       .addComponent(SubHeaderLabel, javax.swing.GroupLayout.PREFERRED_SIZE, 24, javax.swing.GroupLayout.PREFERRED_SIZE) 
       .addGap(18, 18, 18) 
       .addGroup(MainPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) 
        .addComponent(a_Value, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) 
        .addComponent(a_Label)) 
       .addGap(11, 11, 11) 
       .addGroup(MainPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) 
        .addComponent(b_Value, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) 
        .addComponent(b_Label)) 
       .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) 
       .addGroup(MainPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) 
        .addComponent(c_Value, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) 
        .addComponent(c_Label)) 
       .addGap(18, 18, 18) 
       .addComponent(calc_Button) 
       .addGap(33, 33, 33) 
       .addComponent(ResultLabel, javax.swing.GroupLayout.PREFERRED_SIZE, 28, javax.swing.GroupLayout.PREFERRED_SIZE) 
       .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) 
       .addComponent(Root1_Label, javax.swing.GroupLayout.PREFERRED_SIZE, 23, javax.swing.GroupLayout.PREFERRED_SIZE) 
       .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) 
       .addComponent(Root2_Label, javax.swing.GroupLayout.PREFERRED_SIZE, 22, javax.swing.GroupLayout.PREFERRED_SIZE) 
       .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)) 
     ); 

     javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); 
     getContentPane().setLayout(layout); 
     layout.setHorizontalGroup(
      layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
      .addGroup(layout.createSequentialGroup() 
       .addContainerGap() 
       .addComponent(MainPanel, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) 
       .addContainerGap()) 
     ); 
     layout.setVerticalGroup(
      layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
      .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup() 
       .addContainerGap() 
       .addComponent(MainPanel, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) 
       .addContainerGap()) 
     ); 

     pack(); 
    }// </editor-fold>//GEN-END:initComponents 

private void CalculateRoots(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_CalculateRoots 

    double a = (double)(Double.parseDouble(a_Value.getText())); 
    double b = (double)(Double.parseDouble(b_Value.getText())); 
    double c = (double)(Double.parseDouble(c_Value.getText())); 
    double D = 0.0; 
    double r1 = 0.0; 
    double r2 = 0.0; 

    if (a == 0) 
    { 
     ResultLabel.setText("Error: The value of \"a\" cannot be zero."); 
     Root1_Label.setText(""); 
     Root2_Label.setText(""); 
    } 
    else 
    { 
     D = (b * b) - 4 * a * c; 
     if (D < 0) 
     { 
      ResultLabel.setText("Error: The value of \"D\" is less than zero."); 
      Root1_Label.setText("Therefore, Real roots do not exist."); 
      Root2_Label.setText(""); 
     } 
     else 
     { 
      r1 = (- b + Math.sqrt(D))/2 * a; 
      r2 = (- b - Math.sqrt(D))/2 * a; 
      ResultLabel.setText("The value of \"D\" is " + D + ""); 
      Root1_Label.setText("The first root is " + r1 + ""); 
      Root2_Label.setText("The second root is " + r2 + ""); 
     } 
    } 
}//GEN-LAST:event_CalculateRoots 

    /** 
    * @param args the command line arguments 
    */ 
    public static void main(String args[]) { 
     /* Set the Nimbus look and feel */ 
     //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) "> 
     /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel. 
     * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
     */ 
     try { 
      for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) { 
       if ("Nimbus".equals(info.getName())) { 
        javax.swing.UIManager.setLookAndFeel(info.getClassName()); 
        break; 
       } 
      } 
     } catch (ClassNotFoundException ex) { 
      java.util.logging.Logger.getLogger(QuadraticEquations.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
     } catch (InstantiationException ex) { 
      java.util.logging.Logger.getLogger(QuadraticEquations.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
     } catch (IllegalAccessException ex) { 
      java.util.logging.Logger.getLogger(QuadraticEquations.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
     } catch (javax.swing.UnsupportedLookAndFeelException ex) { 
      java.util.logging.Logger.getLogger(QuadraticEquations.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
     } 
     //</editor-fold> 

     /* Create and display the form */ 
     java.awt.EventQueue.invokeLater(new Runnable() { 

      public void run() { 
       new QuadraticEquations().setVisible(true); 
      } 
     }); 
    } 
    // Variables declaration - do not modify//GEN-BEGIN:variables 
    private javax.swing.JLabel AuthorLabel; 
    private javax.swing.JLabel HeaderLabel; 
    private javax.swing.JPanel MainPanel; 
    private javax.swing.JLabel ResultLabel; 
    private javax.swing.JLabel Root1_Label; 
    private javax.swing.JLabel Root2_Label; 
    private javax.swing.JLabel SubHeaderLabel; 
    private javax.swing.JLabel a_Label; 
    private javax.swing.JTextField a_Value; 
    private javax.swing.JLabel b_Label; 
    private javax.swing.JTextField b_Value; 
    private javax.swing.JLabel c_Label; 
    private javax.swing.JTextField c_Value; 
    private javax.swing.JButton calc_Button; 
    // End of variables declaration//GEN-END:variables 
} 

, 나는 간단한 JAR 실행 파일로 컴파일합니다. 지정된 주 클래스는 QuadraticEquations입니다. Windows에서는 실행 및 wrks가 정상이지만 Linux에서는 실행되지 않습니다.

Answer 1

이 예제는 Mac OS X/AppleJDK와 Ubuntu/OpenJDK에서 실행됩니다. 참고로 GroupLayout이 Java 6에 도입되었으므로 설치된 버전을 확인할 수 있습니다.

초보자는 GUI 편집기를 지금 사용하지 말고 layout (예 : GridLayout)을 사용해보십시오. 연습을 위해 JPanel이 Flowlayout 인 중첩 된 레이블과 입력 필드를 같은 줄에 유지하십시오.

향후 연구를 위해 polynomial roots을 찾는 다른 방법을 즐기실 수도 있습니다.

부록 : Ubuntu 10/OpenJDK를 사용하여 스크린 샷을 추가했습니다.

public class QuadraticEquations extends javax.swing.JFrame { 

    /** 
    * Creates new form QuadraticEquations 
    */ 
    public QuadraticEquations() { 
     initComponents(); 
    } 

    private void initComponents() { 
     mainPanel = new javax.swing.JPanel(); 
     headerLabel = new javax.swing.JLabel(); 
     authorLabel = new javax.swing.JLabel(); 
     subHeaderLabel = new javax.swing.JLabel(); 
     a_Label = new javax.swing.JLabel(); 
     b_Label = new javax.swing.JLabel(); 
     c_Label = new javax.swing.JLabel(); 
     a_Value = new javax.swing.JTextField(); 
     b_Value = new javax.swing.JTextField(); 
     c_Value = new javax.swing.JTextField(); 
     calc_Button = new javax.swing.JButton(); 
     resultLabel = new javax.swing.JLabel(); 
     root1_Label = new javax.swing.JLabel(); 
     root2_Label = new javax.swing.JLabel(); 

     setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); 
     setTitle("Quadratic Equations Roots Calculator"); 

     headerLabel.setFont(new java.awt.Font("Lucida Fax", 1, 18)); // NOI18N 
     headerLabel.setForeground(new java.awt.Color(0, 0, 255)); 
     headerLabel.setHorizontalAlignment(javax.swing.SwingConstants.CENTER); 
     headerLabel.setText("Quadratic Equations - Roots Calculator"); 

     authorLabel.setFont(new java.awt.Font("Lucida Fax", 1, 14)); // NOI18N 
     authorLabel.setForeground(new java.awt.Color(0, 165, 0)); 
     authorLabel.setHorizontalAlignment(javax.swing.SwingConstants.CENTER); 
     authorLabel.setText("Afaan Bilal"); 

     subHeaderLabel.setFont(new java.awt.Font("Lucida Fax", 1, 12)); // NOI18N 
     subHeaderLabel.setText("Enter the values of 'a', 'b', 'c' : "); 

     a_Label.setFont(new java.awt.Font("Lucida Fax", 1, 12)); // NOI18N 
     a_Label.setForeground(new java.awt.Color(25, 22, 200)); 
     a_Label.setText("\" a \" :"); 

     b_Label.setFont(new java.awt.Font("Lucida Fax", 1, 12)); // NOI18N 
     b_Label.setForeground(new java.awt.Color(25, 22, 200)); 
     b_Label.setText("\" b \" :"); 

     c_Label.setFont(new java.awt.Font("Lucida Fax", 1, 12)); // NOI18N 
     c_Label.setForeground(new java.awt.Color(25, 22, 200)); 
     c_Label.setText("\" c \" :"); 

     a_Value.setText("1"); 
     b_Value.setText("2"); 
     c_Value.setText("1"); 

     calc_Button.setText("Calculate Roots!"); 
     calc_Button.addActionListener(new java.awt.event.ActionListener() { 

      @Override 
      public void actionPerformed(java.awt.event.ActionEvent evt) { 
       CalculateRoots(evt); 
      } 
     }); 

     resultLabel.setHorizontalAlignment(javax.swing.SwingConstants.CENTER); 
     root1_Label.setHorizontalAlignment(javax.swing.SwingConstants.CENTER); 
     root2_Label.setHorizontalAlignment(javax.swing.SwingConstants.CENTER); 

     mainPanel.setLayout(new java.awt.GridLayout(0,1)); 
     mainPanel.add(headerLabel); 
     mainPanel.add(authorLabel); 
     mainPanel.add(subHeaderLabel); 
     mainPanel.add(a_Label); 
     mainPanel.add(a_Value); 
     mainPanel.add(b_Label); 
     mainPanel.add(b_Value); 
     mainPanel.add(c_Label); 
     mainPanel.add(c_Value); 
     mainPanel.add(calc_Button); 
     mainPanel.add(resultLabel); 
     mainPanel.add(root1_Label); 
     mainPanel.add(root2_Label); 

     add(mainPanel); 
     pack(); 
     setLocationRelativeTo(null); 
    } 

    private void CalculateRoots(java.awt.event.ActionEvent evt) { 

     double a = Double.parseDouble(a_Value.getText()); 
     double b = Double.parseDouble(b_Value.getText()); 
     double c = Double.parseDouble(c_Value.getText()); 
     double d = 0.0; 
     double r1 = 0.0; 
     double r2 = 0.0; 

     if (a == 0) { 
      resultLabel.setText("Error: The value of \"a\" cannot be zero."); 
      root1_Label.setText(""); 
      root2_Label.setText(""); 
     } else { 
      d = (b * b) - 4 * a * c; 
      if (d < 0) { 
       resultLabel.setText("Error: The value of \"D\" is negative."); 
       root1_Label.setText("Therefore, Real roots do not exist."); 
       root2_Label.setText(""); 
      } else { 
       r1 = (-b + Math.sqrt(d))/2 * a; 
       r2 = (-b - Math.sqrt(d))/2 * a; 
       resultLabel.setText("The value of \"D\" is " + d); 
       root1_Label.setText("The first root is " + r1); 
       root2_Label.setText("The second root is " + r2); 
      } 
     } 
    } 

    /** 
    * @param args the command line arguments 
    */ 
    public static void main(String args[]) { 
     /* 
     * Create and display the form 
     */ 
     java.awt.EventQueue.invokeLater(new Runnable() { 

      @Override 
      public void run() { 
       new QuadraticEquations().setVisible(true); 
      } 
     }); 
    } 
    // Variables declaration 
    private javax.swing.JLabel authorLabel; 
    private javax.swing.JLabel headerLabel; 
    private javax.swing.JPanel mainPanel; 
    private javax.swing.JLabel resultLabel; 
    private javax.swing.JLabel root1_Label; 
    private javax.swing.JLabel root2_Label; 
    private javax.swing.JLabel subHeaderLabel; 
    private javax.swing.JLabel a_Label; 
    private javax.swing.JTextField a_Value; 
    private javax.swing.JLabel b_Label; 
    private javax.swing.JTextField b_Value; 
    private javax.swing.JLabel c_Label; 
    private javax.swing.JTextField c_Value; 
    private javax.swing.JButton calc_Button; 
    // End of variables declaration 
}