关于synth的使用问题，我有个地方不太明白，请高手解答

Question

昨天突然想调以下关于自定义皮肤，想用synth方法，但不知道怎么老是出错..... （我是初学者，请高手帮忙解答）我不明白的地方是：
1：下面几行代码要在那个位置上添加？         
          SynthLookAndFeel synth = new SynthLookAndFeel();
         synth.load(Application1.class.getResourceAsStream("demo.xml"),Application1.class);
         UIManager.setLookAndFeel(synth);
   我模仿网上的例子，在线程里添加并创建窗口，但没能输出！！程序如下：
其中xml文件内容如下：
<synth>
     <style id="label">
       <font name="Monospaced" size="18" style="BOLD ITALIC"/>
       <opaque value="true"/>
       <state>
         <color value="PINK" type="FOREGROUND"/>
         <color value="BLUE" type="BACKGROUND"/>
       </state>
     </style>
     <bind style="label" type="region" key="Label"/>
   
<style id="button">
      <font name="Monospaced" size="18" style="BOLD ITALIC"/>
       <opaque value="true"/>
       <state>
         <color value="PINK" type="FOREGROUND"/>
         <color value="BLUE" type="BACKGROUND"/>
       </state>
     </style>
     <bind style="button" type="region" key="Button"/>
 </synth>

Answer 1

程序代码如下
全部程序代码如下：import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.JScrollPane;
import javax.swing.JPanel;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;
import java.math.BigDecimal; 
import java.text.DecimalFormat;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.TableColumnModel;
import javax.swing.table.TableColumn;
import java.text.NumberFormat;
import java.util.Locale;
import javax.swing.event.*;
import javax.swing.plaf.synth.SynthLookAndFeel;
import javax.swing.UIManager;
import java.io.InputStream;
import java.text.ParseException;
public class BankLoan extends JFrame implements ActionListener
{
    private JButton button=new JButton("计算");
    private JLabel label_monney=new JLabel("贷款总金额");
    private JTextField text_monney=new JTextField();
    private JLabel label_tax=new JLabel("贷款利率");
    private JTextField text_tax=new JTextField(); 
    private JLabel label_pt=new JLabel("贷款期限"); 
    private JTextField text_pt=new JTextField();
    private JLabel label_time=new JLabel("起始时间(年/月)");
    private JTextField text_timey=new JTextField();
    private JTextField text_timem=new JTextField();
    private JDialog dialog=new JDialog(this,"提示",true);
    private Label dialog_label=new Label("请填写完整的信息再进行计算",Label.CENTER);
    private JTable table=new JTable();
    public   Vector srcdata=new Vector();  
    Loan loan_now=new Loan();
    public BankLoan() {
    
        
     super("银行贷款还本利息计算工具");
     final String[] columnNames = {"期次", "本金余额", "月还本金", "月还利息","月还本息"};
        Vector srcdataname=new Vector(); 
        srcdataname.add(columnNames[0]);
        srcdataname.add(columnNames[1]);
        srcdataname.add(columnNames[2]);
        srcdataname.add(columnNames[3]);
        srcdataname.add(columnNames[4]);
        
        Container container=this.getContentPane();
        
     this.setSize(650,400);
     this.setLocation(50,100);
     this.setDefaultCloseOperation(EXIT_ON_CLOSE);
    
     JPanel panel1=new JPanel(new java.awt.FlowLayout(FlowLayout.CENTER));
     JPanel panel2=new JPanel(new GridLayout(2,6));
     JPanel panel3=new JPanel(new GridLayout(1,1));
      JPanel panel4=new JPanel(new GridLayout(1,3));
        
     panel2.add(label_monney);
     panel2.add(text_monney);
     Label label_yuan=new Label("元");
     panel2.add(label_yuan);
     panel2.add(label_tax);
     panel2.add(text_tax);
     Label label_yuan1=new Label("%/月");
     panel2.add(label_yuan1);
     panel2.add(label_pt);
     panel2.add(text_pt);
     Label label_yuann=new Label("年");
     panel2.add(label_yuann);  
     panel2.add(label_time);
     panel2.add(text_timey);
     panel2.add(text_timem);
     panel1.add(panel2);
     panel1.add(panel3);
     panel3.add(button);
       
        this.add(panel1,BorderLayout.NORTH);    
     button.addActionListener(this);  
        
        DefaultTableModel model=new DefaultTableModel(srcdata,srcdataname); 
        JScrollPane scrollpane=new JScrollPane(table);
        table.setModel(model);
        container.add(scrollpane,BorderLayout.CENTER);
    // this.setVisible(true);
       
        dialog.setSize(250,130);
        dialog.add(dialog_label);
        dialog.setDefaultCloseOperation(HIDE_ON_CLOSE);
    
    }
     
    public void actionPerformed(ActionEvent e){
     if(e.getSource()==button)
     {     
     if(text_monney.getText().length()==0||text_pt.getText().length()==0||text_tax.getText().length()==0||text_timey.getText().length()==0||text_timem.getText().length()==0)
     {
         dialog.setLocation(this.getX()+70,this.getY()+60);
     dialog.setVisible(true);   
     }
     else
     { 
      if(Integer.parseInt(text_timem.getText())<=12&&Integer.parseInt(text_timem.getText())>=1)//输入合法
     {   
     srcdata.clear(); 
           loan_now.init(text_monney.getText(),text_tax.getText(),text_pt.getText(),text_timey.getText(),text_timem.getText());
         Vector dataadd=new Vector(5);
           Vector dataaddx=new Vector(20);
            
             for(int x=0;x<Integer.parseInt(text_pt.getText())*12;x++)
             {   
                  srcdata.add(loan_now.GetResult(x));       
                        table.repaint();
                        table.updateUI();
                }  
          
                DefaultTableCellRenderer tcr = new DefaultTableCellRenderer(); 
                TableColumnModel Columnmodel = table.getColumnModel(); 
                tcr.setBackground(new Color(220,220,150));
                Columnmodel.getColumn(0).setCellRenderer(tcr);
                TableColumn tcolumn=new TableColumn();        
                             
                table.setColumnSelectionAllowed (true);//设置可否被选择.默认为false
                table.setColumnSelectionInterval(0,0);
                table.setSelectionBackground (Color.white);//      
     }//开始计算
     else
             {
               dialog_label.setText("起始月份应该在1~12之间,请重新输入！");
               dialog.setLocation(this.getX()+70,this.getY()+60);
              dialog.setVisible(true);   
       }
     }
     }
    
    
  
    
    
    }
  
    
    public static void main(String args[])
    {  
       
           SynthLookAndFeel synth = new SynthLookAndFeel();
           try {
             Class aClass = BankLoan.class;
             InputStream is = 
                aClass.getResourceAsStream("synth.xml");
             if (is == null) {
               System.err.println("Missing configuration file");
               System.exit(-1);
             }
             synth.load(is, aClass);
           } catch (ParseException e) {
             System.err.println("Bad configuration file");
             System.exit(-2);
           }
           try {
             UIManager.setLookAndFeel(synth);
           } catch 
              (javax.swing.UnsupportedLookAndFeelException e) {
             System.err.println("Cannot change to Synth");
             System.exit(-3);
           }
            BankLoan a=new BankLoan();
            a.setVisible(true);
         }
       
  
           
           
     
    }

Answer 2

class Loan{

private int loan_money;
private float loan_tax;  
private int loan_pt;  
private float Rtrunmm;
private int loan_year;
private int loan_month;
    public void init(String str_money,String str_tax,String str_pt,String str_year,String str_month)
    {
        this.loan_money=Integer.parseInt(str_money);
this.loan_pt=Integer.parseInt(str_pt)*12;
this.Rtrunmm=(float)this.loan_money/(float)this.loan_pt;
       this.loan_tax=Float.valueOf(str_tax);
       this.loan_year=Integer.parseInt(str_year);
       this.loan_month=Integer.parseInt(str_month);
    }  public Vector GetResult(int x)
    {
          String str=" ";
          Vector data1=new Vector(5); 
      
          NumberFormat numberFormat = NumberFormat.getNumberInstance(Locale.CHINA); 
 
       str=String.valueOf(this.loan_year)+"年"+(String.valueOf(this.loan_month))+"月";
       data1.add(str);
       
         if((this.loan_month+1)>12) 
            {this.loan_year++;this.loan_month=1;}   
         else {this.loan_month++;}
   
          str="￥"+numberFormat.format(new BigDecimal(String.valueOf(this.loan_money-((x)*this.Rtrunmm))).setScale(2, BigDecimal.ROUND_HALF_UP));
       data1.add(str);
      
          str="￥"+numberFormat.format(new BigDecimal(String.valueOf(this.Rtrunmm)).setScale(2, BigDecimal.ROUND_HALF_UP));
          data1.add(str);
      
          str="￥"+numberFormat.format(new BigDecimal(String.valueOf(this.loan_tax*(loan_money-(x*this.Rtrunmm))/100)).setScale(2, BigDecimal.ROUND_HALF_UP)); 
          data1.add(str);
 
          str="￥"+ numberFormat.format(new BigDecimal(String.valueOf(this.Rtrunmm+(this.loan_tax*(loan_money-(x*this.Rtrunmm))/100))).setScale(2, BigDecimal.ROUND_HALF_UP));
          data1.add(str);
          
     return data1 ;
    }
}

Answer 3

我已经开始理解这段代码的运行机理了，
 SynthLookAndFeel synth   =newSynthLookAndFeel(); 
 synth.load(Application1.class.getResourceAsStream("demo.xml"),Application1.class); 
 UIManager.setLookAndFeel(synth); 这些必须要放在构造所有SWING组件之前加入，否则效果是出不来的。所以我这段程序应该要改以下组件的添加顺序。
不知道我想的正不正确呢？？？