来自多个文本字段的Java文本区域更新

我想在java中创建一个调查。我想从多个TextFields和ComboBoxes中同时更新一个TextArea，每一个都单独显示在一个新行上。我只知道如何为一个TextField做。感谢您的支持。来自多个文本字段的Java文本区域更新

import javax.swing.*; 
import javax.swing.border.*; 
import java.awt.*; 
import java.awt.event.*; 
import java.text.DecimalFormat; 

public class LoanCalculator2 extends JFrame 
{ 

    private String [] array1={"1", "2", "3", "4", "5"}; 
    private String [] array2={"Jan", "Feb", "Mar", "Apr", "May"}; 
    private String [] array3={"2000", "2001", "2003", "2004", "2005"}; 
    private String [] array4={"Employed", "Self-Employed", "Unemployed"}; 

    private JLabel l1=new JLabel("Interest Rate %");//labels 
    private JLabel l2=new JLabel("Number Of Years"); 
    private JLabel l3=new JLabel("Loan Amount"); 
    private JLabel l4=new JLabel("Interest Accrural Period"); 
    private JLabel l5=new JLabel("Total Payment"); 

    private JLabel l6=new JLabel("Date"); 
    private JLabel l7=new JLabel("Firstname"); 
    private JLabel l8=new JLabel("Surname"); 
    private JLabel l9=new JLabel("Age"); 
    private JLabel l10=new JLabel("Address"); 
    private JLabel l11=new JLabel("Job Status"); 

    private JTextField t1=new JTextField();//TextFields 
    private JTextField t2=new JTextField(); 
    private JTextField t3=new JTextField(); 
    private JTextField t4=new JTextField(); 
    private JTextField t5=new JTextField(); 
    private JTextField t6=new JTextField();//firstname 
    private JTextField t7=new JTextField();//surname 
    private JTextField t8=new JTextField();//age 
    private JTextField t9=new JTextField();//address 

    JTextArea textArea = new JTextArea(5, 20); 

    private JComboBox cb1=new JComboBox(array1); 
    private JComboBox cb2=new JComboBox(array2); 
    private JComboBox cb3=new JComboBox(array3); 
    private JComboBox cb4=new JComboBox(array4); 

    private JPanel p_base=new JPanel();//Panels 
    private JPanel p_top=new JPanel(); 
    private JPanel p_bottom=new JPanel(); 
    private JPanel p_1=new JPanel(); 
    private JPanel p_2=new JPanel(); 
    private JPanel p_3=new JPanel(); 
    private JPanel p_date=new JPanel(); 
    private JPanel p_left=new JPanel(); 
    private JPanel p_right=new JPanel(); 

    private ButtonGroup group=new ButtonGroup();//Button Group 

    boolean state=false; 
    private JRadioButton b1=new JRadioButton("Monthly", state);//RadioButtons 
    private JRadioButton b2=new JRadioButton("Quarterly", state); 
    private JRadioButton b3=new JRadioButton("Half Yearly", state); 
    private JRadioButton b4=new JRadioButton("Annually", state); 

    private JButton bt1=new JButton("Compute Payment");//Compute Button 
    private JButton bt2=new JButton("Reset");//Reset button 
    private JButton bt3=new JButton("Verify");//Verify Button 

    private TitledBorder p2=new TitledBorder("Compute");//TitleBorder 
    private TitledBorder p1=new TitledBorder("Enter Loan amount, Interest rate and Years"); 
    private TitledBorder p3=new TitledBorder("Interest Accrural Period"); 
    private TitledBorder p4=new TitledBorder("Loan Data"); 
    private TitledBorder p5=new TitledBorder("Customer Details"); 

    GridLayout grid=new GridLayout(4, 1);//ButtonGroup GridLayout 

    private Dimension size1=new Dimension(160, 200); 
    private Dimension size2=new Dimension(300, 200); 

     public LoanCalculator2()//constructor 
     { 
      frameDimensions(); 
      setTitle("Loan Application"); 

      setLayout(new FlowLayout()); 
      p_base.setLayout(new BorderLayout(5, 5)); 
      p_top.setLayout(new BorderLayout(5, 5)); 
     // p_bottom.setLayout(); 

      p_1.setLayout(new GridLayout(5, 2, 5, 5)); 
      p_1.setBorder(p1); 
      p_1.setPreferredSize(size2); 

      p_1.add(l1); p_1.add(t1); 
      p_1.add(l2); p_1.add(t2); 
      p_1.add(l3); p_1.add(t3); 
      p_1.add(l4); p_1.add(t4); 
      p_1.add(l5); p_1.add(t5); 

      t4.setEditable(false); 
      t5.setEditable(false); 

      p_2.setLayout(new GridLayout(1,2,5,5)); 
      p_2.setBorder(p2); 
      p_2.add(bt2); 
      p_2.add(bt1); 

      p_3.setLayout(grid); 
      p_3.setBorder(p3); 
      p_3.setPreferredSize(size1); 
      p_3.add(b1); 
      p_3.add(b2); 
      p_3.add(b3); 
      p_3.add(b4); 

      group.add(b1); 
      group.add(b2); 
      group.add(b3); 
      group.add(b4); 

      p_top.add(p_1, BorderLayout.CENTER); 
      p_top.add(p_2, BorderLayout.SOUTH); 
      p_top.add(p_3, BorderLayout.WEST); 
      p_top.setBorder(p4); 

      p_bottom.setBorder(p5); 
      p_bottom.setLayout(new BorderLayout()); 

      p_left.setLayout(new GridLayout(6,2,5,5)); 

      p_date.setLayout(new FlowLayout()); 
      p_date.add(cb1); 
      p_date.add(cb2); 
      p_date.add(cb3); 

      p_left.add(l6); p_left.add(p_date); 
      p_left.add(l7); p_left.add(t6); 
      p_left.add(l8); p_left.add(t7); 
      p_left.add(l9); p_left.add(t8); 
      p_left.add(l10); p_left.add(t9); 
      p_left.add(l11); p_left.add(cb4); 

      p_right.add(textArea, BorderLayout.CENTER); 
      p_right.add(bt3, BorderLayout.SOUTH); 

      p_bottom.add(p_left, BorderLayout.WEST); 
      p_bottom.add(p_right, BorderLayout.CENTER); 

      p_base.add(p_top, BorderLayout.NORTH); 
      p_base.add(p_bottom, BorderLayout.SOUTH); 
      add(p_base);//add base panel to frame 


      textArea.setLineWrap(true); 
      textArea.setWrapStyleWord(true); 
      textArea.setEditable(false); 

      TheListener listener=new TheListener(); 
      bt1.addActionListener(listener);//compute 
      bt2.addActionListener(listener);//reset 
      bt3.addActionListener(listener);//verify 


     }//end constructor 

    private void Month() 
    { 
     l4.setText("1 Month Payment"); 
     double i=Double.parseDouble(t1.getText()); 
     double r=i/1200; 

     double A=Double.parseDouble(t3.getText()); 

     double n=Double.parseDouble(t2.getText()); 

     double N=n*12; 

     double v1=Math.pow((1+r),-N); 
     double v2=(1-v1); 
     double v3=(r*A)/v2; 
     DecimalFormat df=new DecimalFormat("###.##"); 

     t4.setText(""+df.format(v3)); 

     double v4=v3*N; 
     t5.setText(""+df.format(v4)); 
    } 

    private void Quarter() 
    { 
     l4.setText("3 Month Payment"); 
     double i=Double.parseDouble(t1.getText()); 
     double r=i/400; 

     double A=Double.parseDouble(t3.getText()); 

     double n=Double.parseDouble(t2.getText()); 

     double N=n*4; 

     double v1=Math.pow((1+r),-N); 
     double v2=(1-v1); 
     double v3=(r*A)/v2; 
     DecimalFormat df=new DecimalFormat("###.##"); 

     t4.setText(""+df.format(v3)); 

     double v4=v3*N; 
     t5.setText(""+df.format(v4)); 
    } 

    private void Half() 
    { 
     l4.setText("6 Month Payment"); 
     double i=Double.parseDouble(t1.getText()); 
     double r=i/200; 

     double A=Double.parseDouble(t3.getText()); 

     double n=Double.parseDouble(t2.getText()); 

     double N=n*2; 

     double v1=Math.pow((1+r),-N); 
     double v2=(1-v1); 
     double v3=(r*A)/v2; 
     DecimalFormat df=new DecimalFormat("###.##"); 

     t4.setText(""+df.format(v3)); 

     double v4=v3*N; 
     t5.setText(""+df.format(v4)); 
    } 

    private void Year() 
    { 
     l4.setText("12 Month Payment"); 
     double i=Double.parseDouble(t1.getText()); 
     double r=i/100; 

     double A=Double.parseDouble(t3.getText()); 

     double n=Double.parseDouble(t2.getText()); 

     double N=n; 

     double v1=Math.pow((1+r),-N); 
     double v2=(1-v1); 
     double v3=(r*A)/v2; 
     DecimalFormat df=new DecimalFormat("###.##"); 

     t4.setText(""+df.format(v3)); 

     double v4=v3*N; 
     t5.setText(""+df.format(v4)); 
    } 

    private void Reset() 
    { 
     t1.setText(""); 
     t2.setText(""); 
     t3.setText(""); 
     t4.setText(""); 
     t5.setText(""); 

     l4.setText("Interest Accrural Period"); 

     group.clearSelection(); 

     frameDimensions(); 
    } 

    private void frameDimensions() 
    { 
     setVisible(true); 
     setSize(480,300); 
     setLocationRelativeTo(null); 
     setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
    } 

    private class TheListener implements ActionListener //Listener Class 
    { 
     public void actionPerformed(ActionEvent event) //Event method 
     { 
      Object target=event.getSource(); 
      if(target==bt1) 
      { 
       if(b1.isSelected()) 
       { 
        Month(); 
       } 

       else if(b2.isSelected()) 
       { 
        Quarter(); 
       } 

       else if(b3.isSelected()) 
       { 
        Half(); 
       } 

       else if(b4.isSelected()) 
       { 
        Year(); 
       } 
       else 
       { 
        t4.setText("Error"); 
        t5.setText("Error"); 
       } 

       if(t1.getText().equals("")) 
       { 
        t4.setText("No Data"); 
        t5.setText("No Data"); 
       } 

       if(t2.getText().equals("")) 
       { 
        t4.setText("No Data"); 
        t5.setText("No Data"); 
       } 

       if(t3.getText().equals("")) 
       { 
        t4.setText("No Data"); 
        t5.setText("No Data"); 
       } 
      } 

      if(target==bt2) 
      { 
       Reset(); 
      } 

      if(target==bt3) 
      { 
       textArea.setText(t6.getText()+t7.getText()); 
      } 

     } 
    } 

}

来源

2014-02-26 user3357904

我们来这里不是来编写程序给你。发布你有什么，我们可以尝试帮助你。 – jrowe08

向我们展示一个例子，你如何与一个文本框一样，它不应该是如此不同。你可以附加一个'documentListener'为文本框和一个'ItemSelectionListener'的组合框 – nachokk

使用JTextArea.append而不是JTextArea.setText。不要忘记在每行的末尾放置一个新行（\n）

您也不妨放置JTextArea在JScrollPane或当您添加更多的文本到文本区域，它会增加，占用了在你的UI更多的空间，例如...

p_right.add(new JScrollPane(textArea), BorderLayout.CENTER);

看看How to Use Text Areas和How to Use Scroll Panes更多细节

来源

2014-02-26 23:09:50 MadProgrammer

感谢。我按照自己想要的方式工作，并设法及时完成提交。 – user3357904

你必须做出某种缓冲来存储其中的所有数据。以StringBuilder为例。之后，只是整个缓冲区追加到文本区

来源

2014-02-26 21:57:18 over9k

来自多个文本字段的Java文本区域更新

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